Tag: ichthyology

“Oscar describes Oscar”: Interview with Oscar Lasso-Alcalá, Pt 3

“This is why Mikolji’s Oscar is a highly appreciated species in the aquarium hobby. It is more than just a fish in an aquarium when it is considered a true pet.”

In this last part, we talked with ichthyologist Oscar Miguel Lasso-Alcalá about what makes Astronotus mikoljii – a new to science cichlid species that he recently described in ZooKeys – so special.

Find Part 1 and Part 2 of the interview.

What makes this species so charismatic and loved by aquarists and ichthyologists?

I already spoke about my experience as an aquarist from an early age, where the qualities of the species of the Astronotus genus, known as Oscars are highlighted.

Different varieties and color patterns have been obtained from them through selective breeding, or genetic manipulation, which are called living modified organisms (LMOs) or genetically modified organisms (GMOs).

However, the true lovers of nature, the aquarians of the “Biotope Aquarium” movement  and the like, prefer pure specimens to manipulated or artificially modified ones. This is why Mikolji’s Oscar is a highly appreciated species in the aquarium hobby. It is more than just a fish in an aquarium since it is considered a true pet.

For ichthyologists, it is remarkably interesting and at the same time very challenging to study a genus like Astronotus, which already has only three described species (Astronotus ocellatus, A. cassiprinnis and A. mikoljii).

This is an unusual situation, which, as we have reported, requires an integrative approach and the work and experience of different specialists for its study. With all certainty, as in the case of Mikolji’s Oscar, other species of the genus Astronotus remain to be studied and described, and we hope that we will have the fortune to participate with our experience in these new works.

Local people have long known this species. What role does it have in their lives?

It is important to clarify that Astronotus mikoljii is a new species for science, but it is not a “new species” for people who already knew it locally under the name of Pavona, Vieja, or Cupaneca in Venezuela or Pavo Real, Carabazú, Mojarra and Mojarra Negra in Colombia. Nor for the aquarium trade, where it was known by the common name of Oscar and scientific name of Astronotus ocellatus, or, to a lesser degree, as Astronotus cassiprinnis.

This species has been of great food importance for thousands of years for at least nine indigenous ethnic groups.

Much less is it a new species for the nine thousand-year-old indigenous ethnic groups that share their world with the habitat of this fish, who baptized it with some 14 different names, known in their languages as mijsho (Kariña), boisikuajaba (Warao), hácho (Pumé = Yaruro), phadeewa, jadaewa (Ye’Kuana = Makiritare), perewa, parawa (Eñepá = Panare), yawirra (Kúrrim = Kurripako), kohukohurimï, kohokohorimï, owënawë kohoromï” (Yanomami = Yanomamï), eba (Puinave), Itapukunda (Kurripako), uan (Tucano).

Hence, the importance of scientific names, since the same species can have multiple common names, in the same language or in multiple languages.

It is important to note that very few studies that describe new species for science include the common names of the species, as given by the indigenous ethnic groups or natives of the regions, where the species live.

This species has been of great food importance for thousands of years for at least nine indigenous ethnic groups, and for more than 500 years to the hundreds of human communities of locals who inhabit the Orinoco River basin in Venezuela and Colombia. In our studies, in the plains of Orinoco from 30 years ago, we were able to verify its consumption, as well as high gastronomic value, due to its pleasant taste and enhanced texture.

However, due to my imprint as an aquarist, I have not wanted to consume it on the different occasions that it was offered to me, because it is very difficult to eat the beloved pets that we had in our childhood.

Why is this fish important to people and to ecosystems?

It is especially important to highlight that the Astronotus mikoljii species plays a very important role in the ecosystem, due to its biological and ecological background.

Although it can feed from different sources, it is a fundamentally carnivorous species, and therefore, it “controls” other species in the ecosystem.

Without Mikolji’s Oscar, the aquatic ecosystem would lose one of its fundamental links and the delicate balance of its functioning, because the species it feeds on could increase their populations uncontrollably, becoming veritable pests. This would put in great danger the entire future of the aquatic ecosystem of the Orinoco River basin and the permanence of other species of ecological importance.

In addition, it would surely affect other species used by man, both those of commercial importance (sold as food or as ornamental species), and for the subsistence fishing of native and indigenous inhabitants.

Mikolji’s Oscar, although a carnivorous species, also has its natural predators, for example piranhas and other predatory fish. For this reason, it evolved with an ocellus, or false eye, at the base of the caudal fin, to confuse its predators and guarantee its survival. Obviously, this species will be compromised if we don’t learn about it, use its populations wisely and preserve it in the long term.

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Photos by Ivan Mikolji.

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You can find Part 1 and Part 2 of the interview with Oscar.

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“Oscar describes Oscar”: Interview with Oscar Lasso-Alcalá, Pt 2

“Working in science in a country under these conditions, and getting to publish the results of the investigations in high-level scientific journals such as ZooKeys, is an act of “true heroism”.

Oscar Miguel Lasso-Alcalá, MSc. is a Spanish-Venezuelan ichthyologist. This summer, his team described a new species of Oscar fish in the journal ZooKeys.

In this second part of his interview, he tells us about the challenges in his work and shares the story behind the new cichlid’s name. You can find Part 1 of the interview.

What did you find to be the biggest challenge?

Throughout the past seven years, the description of this species has been a real challenge. Our group of researchers knew from the beginning that it was going to be a difficult job.  However, we never imagined the magnitude of the problems or challenges we would encounter.

We had to study the specimens from the Orinoco River basin in Venezuela and Colombia, and rivers from the hydrographic basin of the Gulf of Paria in Venezuela, which were within our reach, in the main scientific collections of fishes in Venezuela. Similarly, we studied the specimens from the Amazon River basin in one of the main collections in Brazil. We studied the traditional external morphology (morphometric characters, or the body, and meristic measurements, or the number of structures or parts such as scales, fins, etc.) and their coloration, as well as their internal morphology, that is, the study of structures of their skeleton, with the use of high-definition radiographs, where we found the main differences with other species.

A novel technique was the study of the shape of the otoliths, or “ear stones”, a technique not used before in the study of this group of fish. That is why I mentioned before that we also made some great scientific discoveries.

In addition to the long and meticulous laboratory work, we also had to conduct field work, not only to capture new specimens for the morphological study, but also for the genetic and molecular study, a new methodology that has become popular in recent years as a way to support taxonomy and systematics in the description and classification of species.

For this latest work, we also relied on a recent study in this area of ​​research, carried out by the genetics specialists on our work team. This means our research was based on what is currently called “integrative taxonomy”, which is the sum of different techniques, methods, and technologies, at the service of achieving our goal: the description of a new species for science and for the world.

Many other difficulties came up along the way, which is why this research took over seven years to be published. Normally, researchers cannot focus 100% of their time on one single research, and workloads fluctuate. Sometimes we think that a greater number of specialists would help distribute the workload evenly or that getting input from others with different fields of experience, sometimes specialized, would help enrich the work, but that also makes it more difficult to reach agreement. Reaching perfection is never possible, and it took a long time for us to reach a level of results that was both acceptable to all and well accepted in the field of taxonomy and systematics.

One of the biggest challenges was purely financial. While we had some funds from Brazilian research support organizations and two universities, this was not the case in Venezuela, a country plunged in a serious political, social, economic, and humanitarian crisis.

Working in science in a country under these conditions, and being able to publish your results in high-level scientific journals, including ZooKeys, is an act of “true heroism”, as my brother José Antonio often says when cheering on my publication.

How come you named it after Ivan Mikolji?

People who do not know about the great work carried out by river explorer Ivan Mikolji might wonder about that, but the thousands of people, connoisseurs and followers of his work are absolutely clear on the justification for this appointment.

Find more about Ivan Mikolji and his work on his website: https://mikolji.com/.

In addition to being an excellent professional explorer, author, underwater photographer, audiovisual producer and even plastic artist, he is a tireless and enthusiastic disseminator of the biodiversity and natural history of freshwater fish in Venezuela and Colombia.

His work has contributed greatly to the knowledge and conservation of the aquatic ecosystems of both countries. His motto is: “You cannot preserve something that you don’t know exists.”

He has made dozens of photography and art exhibitions in Venezuela, Mexico and the United States, as well as award-winning documentaries on the Orinoco River and its biodiversity that have acquired millions of views.

Mikolji has also inspired thousands of “conservationist” aquarists, as a judge in a worldwide movement called “Biotope Aquariums,” where people try to simulate, as much as possible, the ecosystems and aquatic biodiversity of their places of origin, for the conservation of their local biodiversity.

In addition, his educational work further includes the “Wild Aquarium”, a new movement and methodology, where he recreates in the same place (in situ), a “Biotope aquarium”, helping local communities (children and adults) learn about local aquatic ecosystems and biodiversity and their conservation.

In addition to his great artistic, informative, and educational work, with the enormous data accumulated in more than 15 years of work and field observations, in the recent years, he has participated in different research projects, publishing books and numerous scientific articles, some of them with us. For this reason, in 2020, he was appointed Associate Researcher of the Museo de Historia Natural La Salle (Caracas) of the Fundación La Salle de Ciencias Naturales, in Venezuela. By the way, we are planning research that we hope to announce soon in various publications.

Regarding Astronotus mikoljii, our good friend and now colleague Ivan Mikolji, was the one who initially proposed that we describe this species that he loves so much. He selflessly supported all the authors throughout the study in diverse ways, even in the field work in Venezuela. Ivan helped us in the search for equipment and materials, in the search for information, in the photographic work, and now in the dissemination of this study. For this reason, the article, in just one week, achieved more than 4,500 downloads, both on ZooKeys and ResearchGate web platforms, a true record for a study of this type.

Most importantly, throughout these years, Ivan has always encouraged us not to lose our course and objective, even in the most difficult moments. After years of knowing him, we have cultivated an excellent friendship. This is why we decided that it was just and necessary to recognize his work, help, companionship, and friendship, naming this beautiful and beloved species in his honor.

Photos by Ivan Mikolji.

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You can find Part 1 and continue reading with Part 3.

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“Oscar describes Oscar”: Interview with Oscar Lasso-Alcalá, Pt 1

“As an ichthyologist, I feel pride in collaborating and contributing to science, nationally, regionally, and globally.”

Oscar Miguel Lasso-Alcalá, MSc., is a Spanish-Venezuelan ichthyologist with undergraduate studies in Oceanography, Fishing Technology and Aquaculture, and Postgraduate studies in Agricultural Zoology and Estuary Ecology. He has worked in diverse areas such as taxonomy, biology, ecology, freshwater, estuarine, and marine fisheries and management. For 33 years, he has participated in more than 70 research projects and published over 250 studies. He has made more than 250 scientific expeditions to different regions of Venezuela and six other countries in America. He has dedicated much of his work to studying, educating, and managing introduced species and their invasions.

This summer, Oscar’s team described a new species of cichlid fish from northern South America in our journal ZooKeys. We spoke to him to find out how they came to the discovery and what it means to him.

When did you discover the new species?

Although some taxonomists have specimens that they believe, or have preliminarily diagnosed, to correspond to different, undescribed or new-to-science species (in my case I know of around 15 species I’ve diagnosed as new), Astronotus mikoljii was different. We did not discover that it was a new species overnight.

Normally, the process of discovering a new species takes a long time and a lot of work. It is not an easy task. First, you need to analyze the external and internal morphology. You study the color pattern and other characteristics and compare them to those of known, described species that are akin or similar to the one being studied, looking for the main differences. It is also very important to carry out exhaustive documentary and bibliographical research, to learn about all related species that have been previously described. Then, if there is complete certainty that it’s a different species that has not been previously described and published, there’s an entire process of formal description of the new species.

Did you immediately recognize it as a new species?

Absolutely not. Mikolji’s Oscar is difficult to differentiate externally. The first researcher who evidenced the main differences of Astronotus ocellatus (a binomial as it was previously known) from the Orinoco River basin, was the Swedish ichthyologist Sven Oscar Kullander, curator at the Swedish Museum of Natural History in Stockholm. He is one of the greatest specialists in the world on species of the Cichlidae family, to which the species we were studying belongs. This was first published in 1981, followed by his 1983, 1986, and 1989 studies (including his Ph.D. thesis) and later in other studies of his published in 2003 (all cited in our recent article published in the ZooKeys journal).

Likewise, my brother, the Spanish and Venezuelan ichthyologist Carlos Andrés Lasso, currently a researcher at the Instituto de Recursos Biológicos Alexander von Humboldt of Colombia, with more than 40 years of experience, also recognized this species from the Orinoco River as different from the one present in the Amazon River basin. In 18 different studies carried out in Venezuela and Colombia (all cited in our article), he records this species as Astronotus cf ocellatus (“cf” means the species name is yet to be confirmed), or directly as Astronotus sp., already assuring that it was a different species and new to science.

We are letting the world know a defined and individual species exists.

With this background, we responsibly acknowledge that it was Sven and Carlos who discovered Mikolji’s Oscar, and not us. Our credit and recognition are given for the process of describing the new species and for its publication. It is very important to clarify here that the discovery of a new-to-science species and its description (and publication) are two different facts, situations, and processes. However, in our study, we discovered some very important morphological characteristics, as well as genetic information, that allowed the differentiation of this species from those already known.

What was most exciting about this finding?

 As an ichthyologist, I feel pride in collaborating and contributing to science, nationally, regionally, and globally. I feel satisfaction every time I share my research results at a scientific event or meeting (congress, symposium), or publish them in a scientific book (or part of it) or in a popular journal. This is not just an ordinary job for me, since I really like to investigate, and almost always have a lot of fun with this activity. As I have said in many of the interviews that I have had throughout my over 30-year career: to me, it’s not a job, it’s a way of living.

It fills me with great satisfaction to have the opportunity, more than 40 years after first meeting these Oscars, to be able to study them, describe them, and give them the name and place they deserve in science, and in the world.

The description of a species which is new to science is something really special, not only for me and my colleagues in this study, but for the vast majority of taxonomists. This is not only due to the fact that our last names will always appear next to the scientific name, but also to the fact that we are letting the world know a defined and individual species exists. By adding another species, we increase the known biodiversity of a country, a region, and the world, and therefore, we demonstrate that biodiversity must be studied, managed, conserved, and used rationally and independently.

Astronotus mikoljii is a very charismatic species, highly appreciated, valued, and loved in the aquarium hobby.

I remember that as a kid (between 7 and 13 years old), in the aquariums built at home by two of my older brothers, José Antonio and Carlos, to whom I largely owe being an ichthyologist today, we had some specimens of Oscars from Orinoco. We bought them in a local aquarium store in Caracas and took care of them, loved them like little children. I remember that in addition to feeling happily identified with the name (Oscar), they felt like real pets. They “got excited” when they saw us, took food directly from our hands without biting our fingers, and even let themselves be caressed, as if they were docile puppies or kittens. They were my favorite fish.

Years later, as an adult, beginning my research years, in the late 80’s and early 90’s, even with aquariums in our house (I had more than 20 in my good time as an aquarist), we had new specimens of these Oscars. This time, they were specimens captured by my brother and me, in the floodplains of the Orinoco River (Llanos de Apure), where for more than five years we studied the biology and ecology of some 200 local fish species, many of them unique in the world just like Mikolji’s Oscar. From that field study came the doctoral thesis of my brother Carlos, and the undergraduate theses of half a dozen other researchers, including mine.

It fills me with great satisfaction to have the opportunity, more than 40 years after first meeting these Oscars, to be able to study them, describe them, and give them the name and place they deserve in science, and in the world. It also fills me with deep satisfaction, having the opportunity to describe a “large-sized” species that was apparently already known, both locally and nationally (for its importance in fishing), as well as internationally in the world of aquarism. That is why, as I shared our study and finding on social media, I wrote: “Oscar describes the Oscar: Mikolji’s Oscar.“

We are also extremely grateful to the many people who helped us and collaborated with us in this study, by collecting new specimens in the field, reviewing fish collections under their care, taking X-rays, searching for specialized bibliographies, studying the native or indigenous names, and even editing and publishing the article in Zookeys journal.

Likewise, it was exciting to share this research experience with colleagues from Brazil (co-authors of this study, just like me), who trusted us and our meticulous work.

Photos by Ivan Mikolji

The story continues with Part 2 and Part 3.

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Estimating somatic growth of fishes from maximum age or maturity

Two new data-limited methods to estimate somatic growth, applicable to species with indeterminate growth such as fishes or invertebrates.

Somatic growth rate is a central life-history parameter, especially in species like fishes or invertebrates which grow throughout their lives. It is needed in conservation and fisheries management but it can sometimes be tricky to estimate.

In a recent study published in the journal Acta Ichthyologica et Piscatoria, Dr. Rainer Froese of the Helmholtz Centre for Ocean Research proposes new simplified methods for somatic growth estimation.

A school of Jacks pass overhead at Viuda (Widow) dive site, in Coiba National Park, Panama, a UNESCO World Heritage site. Photo by LASZLO ILYES under a CC-BY 2.0 license.

Dr. Froese presents two new data-limited methods to estimate somatic growth from maximum length combined with either length or age at maturation or with maximum age. They are applicable to a wide range of species, sizes, and habitats. Using these new methods, growth parameter estimates were produced for the first time for 110 fish species.

“The growth estimates derived with the new methods presented in this study appear suitable for consideration and preliminary guidance in applications for conservation or management,” Dr. Froese points out in his study.

He goes on to suggest that journals accept growth estimates performed with the new methods as new knowledge, if they are the first for a given species.

In order to facilitate the conservation and management of natural resources, FishBase will continue to compile growth parameters, including results obtained with these new methods.

Research article:

Froese R (2022) Estimating somatic growth of fishes from maximum age or maturity. Acta Ichthyologica et Piscatoria 52(2): 125-133. https://doi.org/10.3897/aiep.52.80093

First-ever fish species described by a Maldivian scientist

Though there are hundreds of species of fish found off the coast of the Maldives, a mesmerizing new addition is the first-ever to be formally described by a Maldivian researcher.

Named after the country’s national flower, the species is added to the tree of life as part of the California Academy of Sciences’ global Hope for Reefs initiative

Originally published by the California Academy of Sciences

Though there are hundreds of species of fish found off the coast of the Maldives, a mesmerizing new addition is the first-ever to be formally described—the scientific process an organism goes through to be recognized as a new species—by a Maldivian researcher.

The new-to-science Rose-Veiled Fairy Wrasse (Cirrhilabrus finifenmaa), described in the journal ZooKeys, is also one of the first species to have its name derived from the local Dhivehi language, ‘finifenmaa’ meaning ‘rose’, a nod to both its pink hues and the island nation’s national flower.

Scientists from the California Academy of Sciences, the University of Sydney, the Maldives Marine Research Institute (MMRI), and the Field Museum collaborated on the discovery as part of the Academy’s Hope for Reefs initiative aimed at better understanding and protecting coral reefs around the world.

“It has always been foreign scientists who have described species found in the Maldives, even those that are endemic, without much involvement from local scientists. This time, it is different and getting to be part of something for the first time has been really exciting, especially having the opportunity to work alongside top ichthyologists on such an elegant and beautiful species,”

says study co-author and Maldives Marine Research Institute biologist Ahmed Najeeb.

First collected by researchers in the 1990s, C. finifenmaa was originally thought to be the adult version of a different species, Cirrhilabrus rubrisquamis, which had been described based on a single juvenile specimen from the Chagos Archipelago, an island chain 1,000 kilometers (621 miles) south of the Maldives. 

In this new study, however, the researchers took a more detailed look at both adults and juveniles of the multicolored marvel, measuring and counting various features, such as the color of adult males, the height of each spine supporting the fin on the fish’s back and the number of scales found on various body regions. These data, along with genetic analyses, were then compared to the C. rubrisquamis specimen to confirm that C. finifenmaa is indeed a unique species. 

Importantly, this revelation greatly reduces the known range of each wrasse, a crucial consideration when setting conservation priorities.  

“What we previously thought was one widespread species of fish, is actually two different species, each with a potentially much more restricted distribution. This exemplifies why describing new species, and taxonomy in general, is important for conservation and biodiversity management,”

says lead author and University of Sydney doctoral student Yi-Kai Tea. 

Despite only just being described, the researchers say that the Rose-Veiled Fairy Wrasse is already being exploited through the aquarium hobbyist trade. 

“Though the species is quite abundant and therefore not currently at a high risk of overexploitation, it’s still unsettling when a fish is already being commercialized before it even has a scientific name. It speaks to how much biodiversity there is still left to be described from coral reef ecosystems,”

says senior author and Academy Curator of Ichthyology Luiz Rocha, PhD, who co-directs the Hope for Reefs initiative.

Last month, Hope for Reefs researchers continued their collaboration with the MMRI by conducting the first surveys of the Maldives’ ‘twilight zone’ reefs—the virtually unexplored coral ecosystems found between 50- to 150-meters (160- to 500-feet) beneath the ocean’s surface—where they found new records of C. finifenmaa along with at least eight potentially new-to-science species yet to be described. 

This new-to-science Rose-Veiled Fairy Wrasse (Cirrhilabrus finifenmaa) became the first Maldivian fish to ever be described by a local researcher.
Photo by Yi-Kai Tea.

For the researchers, this kind of international partnership is pivotal to best understand and ensure a regenerative future for the Maldives’ coral reefs. 

“Nobody knows these waters better than the Maldivian people. Our research is stronger when it’s done in collaboration with local researchers and divers. I’m excited to continue our relationship with MMRI and the Ministry of Fisheries to learn about and protect the island nation’s reefs together,”

says Rocha says

“Collaborating with organizations such as the Academy helps us build our local capacity to expand knowledge in this field. This is just the start and we are already working together on future projects. Our partnership will help us better understand the unexplored depths of our marine ecosystems and their inhabitants. The more we understand and the more compelling scientific evidence we can gather, the better we can protect them,”

adds Najeeb.

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Research article:

Tea Y-K, Najeeb A, Rowlett J, Rocha LA (2022) Cirrhilabrus finifenmaa (Teleostei, Labridae), a new species of fairy wrasse from the Maldives, with comments on the taxonomic identity of C. rubrisquamis and C. wakanda. ZooKeys 1088: 65-80. https://doi.org/10.3897/zookeys.1088.78139

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Learning more about vampire fish: first report of candiru attached to an Amazonian thorny catfish

For the first time, scientists report a vampire fish attached to the body of an Amazonian thorny catfish. Very unusually, the candirus were attached close to the lateral bone plates, rather than the gills, where they are normally found. Since the hosts were not badly harmed, and the candirus apparently derived no food benefit, scientists believe this association is commensalistic rather than parasitic. The research is published in the open-access journal Acta Ichthyologica et Piscatoria.

Guest blog post by Chiara C. F. Lubich, André R. Martins, Carlos E. C. Freitas, Lawrence E. Hurd and Flávia K. Siqueira-Souza

The Amazon River Basin is home to about 15% of all freshwater fish species known to science, and an estimated 40% yet to be named. These include some of the most bizarre fishes: the vampire fishes, locally known as candiru, members of the catfish subfamily Vandelliinae.). They survive by attaching themselves to the bodies of other fish and sucking on their blood, hence their common name. Yet, it was only recently that we found out that one candiru species, belonging to the genus Paracanthopoma, seems to be making use of its host in quite a different way.

During a sampling study of freshwater fish fauna in a lake of the Demeni River Basin, a left bank tributary of the Negro River, we found candirus attached to the surface of the body of an Amazonian species of a thorny catfish. By the end of the survey, we had observed a total of twenty candirus attached to the outside of the bodies of nine larger Doras phlyzakion, one or two per host. Very unusually, the candirus were attached close to the lateral bone plates, rather than the gills, where these fish are normally found.

Location of the study: Demeni River, left bank tributary of Negro River, Amazonas State, Brazil.

As a result of these observations, we recently published the first record of a candiru attached to the body surface of an Amazonian thorny catfish in an article in the open-access scholarly journal Acta Ichthyologica et Piscatoria.

Vampire fish have long and robust snouts, with strong dentary teeth that help them stay attached to the epidermis of their host and feed on its blood. However, when we performed a macroscopic analysis of the stomach contents of the preserved Paracanthopoma specimens, we were surprised to find no coagulated blood, nor flesh, skin or mucus. This might indicate an interaction between parasite and host that is more benign than usually attributed to vampire fish. 

Doras phlyzakion with vampire fish (Paracanthopoma sp.)  fixed into its epidermis close to the bony plates of the lateral line. Arrows: areas with reddish wounds.

We believe the association between candiru and host in this case might be commensalistic (where one organism benefits from another without harming it), rather than parasitic, because the hosts were not badly harmed, and the candiru apparently derived no food benefit. 

But what else would they seek on the back of Amazonian thorny catfish? One explanation could be that, since candirus are tiny and nearly transparent, they might be avoiding getting noticed by visual predators by riding on larger fish. Another hypothesis is that they could be using their big cousins to transport them over longer distances that they wouldn’t be able to cover themselves, eventually making it to safety or new food sources.

Research article:

Lubich CCF, Martins AR, Freitas CEC, Hurd LE, Siqueira-Souza FK (2021) A candiru, Paracanthopoma sp. (Siluriformes: Trichomycteridae), associated with a thorny catfish, Doras phlyzakion (Siluriformes: Doradidae), in a tributary of the middle Rio Negro, Brazilian Amazon. Acta Ichthyologica et Piscatoria 51(3): 241-244. https://doi.org/10.3897/aiep.51.e64324

Acta Ichthyologica et Piscatoria signs with Pensoft and moves to ARPHA

The scholarly publisher and technology provider Pensoft welcomes the latest addition to its diverse portfolio of scholarly outlets – the open-access, peer-reviewed journal Acta Ichthyologica et Piscatoria (AIeP), which publishes research in the fields of ichthyology and fisheries.

AIeP is an international scientific journal publishing articles in any aspect of ichthyology and fisheries concerning true fishes (fin-fishes), including taxonomy, biology, morphology, anatomy, physiology, pathology, parasitology, reproduction and zoogeography. The academic outlet, which was launched in 1970, favours research based on original experimental data or experimental methods, or new analyses of already existing data. AIeP is indexed by all major indexers, including Web of Science and Scopus. The journal’s first Impact Factor was released in 2010, and currently stands at 0.629 (2019).

The first 2021 issue of the the open-access, peer-reviewed international journal Acta Ichthyologica et Piscatoria is already online on a brand-new website

In joining the Pensoft portfolio, AIeP gets a brand-new user-friendly website with improved design and access to Pensoft’s self-developed full-featured platform ARPHA, which offers an end-to-end publishing solution from submission to publication, distribution and archiving. With features, such as papers available in semantically enhanced HTML and machine-readable XML formats, automated data export to aggregators, and web-service integrations with major global indexing databases, the easy-to-use, open-access platform ensures that published research is easy to discover, access, cite and reuse by both humans and machines all over the world.

AIeP’s first issue published with Pensoft features 14 scientifically diverse open-access articles on ichthyology and fisheries covering a wide geographic scope. Some of the issue’s most interesting reads explore the eating habits of the spotted rose snapper in the Gulf of California, offer the first underwater photograph of a rare scorpionfish in Japan, and record the first ever occurrence of the pharaoh cardinal fish in Libyan waters, in what constitutes the westernmost Mediterranean area of colonization of this non-indigenous species.

Amongst the published papers there are also practical suggestions for species conservation and sustainable fisheries management – for example, an evaluation of the size of freshwater fish in Bangladeshi wetlands recommends only harvesting fishes with a total length of over 8.80 cm.

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Additional information

About ARPHA:

ARPHA is the first end-to-end, narrative- and data-integrated publishing solution that supports the full life cycle of a manuscript, from authoring to reviewing, publishing and dissemination. ARPHA provides accomplished and streamlined production workflows that can be customized according to the journal’s needs. The platform enables a variety of publishing models through a number of options for branding, production and revenue models to choose from.

About Pensoft:

Pensoft is an independent academic publishing company, well-known worldwide for its innovations in the field of semantic publishing, as well as for its cutting-edge publishing tools and workflows. In 2013, Pensoft launched the first ever end to end XML-based authoring, reviewing and publishing workflow, as demonstrated by the Pensoft Writing Tool (PWT) and the Biodiversity Data Journal (BDJ), now upgraded to the ARPHA Publishing Platform. Flagship titles include: Research Ideas and Outcomes (RIO), One Ecosystem, ZooKeys, Biodiversity Data Journal, PhytoKeys, MycoKeys and many more.

Contacts:

Wojciech Piasecki, Editor-in-Chief at AIeP

editor@aiep.pl

Lyubomir Penev, founder and CEO at Pensoft and ARPHA

l.penev@pensoft.net 

A new character for Pokémon? Novel endemic dogfish shark species discovered from Japan

A new endemic deep-water dogfish shark: Squalus shiraii, was discovered in the tropical waters of Southern Japan by an international team of scientists led by Dr. Sarah Viana from South African Institute for Aquatic Biodiversity. The finding brings the amount of spurdogs shark species inhabiting Japanese waters to six. The discovery is published in the open-access journal Zoosystematics and Evolution.

Newly discovered creatures can often be as impressive and exciting as the ones from the Japanese movies and shows. Many of those fictional characters, including inhabitants of the famous Pokémon universe, might have their analogues among the real animals native to Japan. Maybe, a new species of the dogfish shark published in the open-access journal Zoosystematics and Evolution is also “a real Pokémon” to be?

A new deep-water dogfish shark: Squalus shiraii, was discovered in the tropical waters of Southern Japan by an international team of scientists, led by Dr. Sarah Viana from South African Institute for Aquatic Biodiversity. 


 Map of the North-western Pacific Ocean, showing the geographical distribution of Squalus shiraii
Credit: Sarah Viana
License: CC-BY 4.0

The new shark has the body length of 59-77 cm and some unique characteristics such as tall first dorsal fin and caudal fin with broad white margins. Currently, the species is known exclusively as a Japanese endemic, occurring in the tropical shallow waters of Southern Japan in the North-western Pacific.


Squalus shiraii lateral view
Credit: Sarah Viana
License: CC-BY 4.0

Spurdogs represent commercially important for the world fish trade taxa. They are caught for a range of purposes: consumption of meat, fins and liver oil. Despite their high occurrence, the accurate identification data of species is scarce, population threats and trends remain unknown.

Japan currently represents one of the world’s leading shark fish trade countries, though, during the last decades the amount of shark catches is decreasing and over 78 elasmobranch species traded in Japanese shark fin markets are now evaluated as threatened.

The new species Squalus shiraii previously used to be massively misidentified with shortspine spurdog, due to the resembling shape of body, fins and snout length. However, there are some differences, defining the specificity of the new species.

“Squalus shiraii has body brown in colour, postventral and preventral caudal margins whitish, dorsal and ventral caudal tips broadly white and black upper caudal blotch evident in adults. S. mitsukurii has body conspicuously black to dark grey and caudal fins black throughout with post-ventral caudal margin fairly whitish and black upper caudal blotch not evident in adults”, shares lead author Dr. Viana.

Scientists propose the name for the newly described species as Shirai’s spurdog in honour to Dr. Shigeru Shirai, the former Japanese expert of the group.

Original source:
Viana STFL, Carvalho MR (2020) Squalus shiraii sp. nov. (Squaliformes, Squalidae), a new species of dogfish shark from Japan with regional nominal species revisited. Zoosystematics and Evolution 96(2): 275-311. https://doi.org/10.3897/zse.96.51962

Contact:
Dr. Sarah Viana
Email: stviana@gmail.com


On the edge between science & art: historical biodiversity data from Japanese “gyotaku”

Japanese cultural art of ‘gyotaku’, which means “fish impression” or “fish rubbing”, captures accurate images of fish specimens. It has been used by recreational fishermen and artists since the Edo Period. Distributional data from 261 ‘Gyotaku’ rubbings were extracted for 218 individual specimens, roughly representing regional fish fauna and common fishing targets in Japan through the years. The results of the research are presented in a paper published by Japanese scientists in open-access journal Zookeys.

Japanese cultural art of ‘gyotaku’, which means “fish impression” or “fish rubbing”, captures accurate images of fish specimens. It has been used by recreational fishermen and artists since the Edo Period. Distributional data from 261 ‘Gyotaku’ rubbings were extracted for 218 individual specimens, roughly representing regional fish fauna and common fishing targets in Japan through the years. The results of the research are presented in a paper published by Japanese scientists in open-access journal Zookeys.

Historical biodiversity data is being obtained from museum specimens, literature, classic monographs and old photographs, yet those sources can be damaged, lost or not completely adequate. That brings us to the need of finding additional, even if non-traditional, sources. 

In Japan many recreational fishers have recorded their memorable catches as ‘gyotaku’ (魚拓), which means fish impression or fish rubbing in English. ‘Gyotaku’ is made directly from the fish specimen and usually includes information such as sampling date and locality, the name of the fisherman, its witnesses, the fish species (frequently its local name), and fishing tackle used. This art has existed since the last Edo period. Currently, the oldest ‘gyotaku’ material is the collection of the Tsuruoka City Library made in 1839.

Traditionally, ‘gyotaku’ is printed by using black writing ink, but over the last decades colour versions of ‘gyotaku’ have become better developed and they are now used for art and educational purposes. Though, the colour prints are made just for the means of art and rarely include specimen data, sampling locality and date.

In the sense of modern technological progress, it’s getting rarer and rarer that people are using ‘gyotaku’ to save their “fishing impressions”. The number of personally managed fishing-related shops is decreasing and the number of original ‘gyotaku’ prints and recreational fishermen might start to decrease not before long.

Smartphones and photo cameras are significantly reducing the amount of produced ‘gyotaku’, while the data from the old art pieces are in danger of either getting lost or diminished in private collections. That’s why the research on existing ‘gyotaku’ as a data source is required.

A Japanese research team, led by Mr. Yusuke Miyazaki, has conducted multiple surveys among recreational fishing shops in different regions of Japan in order to understand if ‘gyotaku’ information is available within all the territory of the country, including latitudinal limits (from subarctic to subtropical regions) and gather historical biodiversity data from it.

In total, 261 ‘gyotaku’ rubbings with 325 printed individual specimens were found among the targeted shops and these data were integrated to the ‘gyotaku’ database. Distributional data about a total of 235 individuals were obtained within the study.

The observed species compositions reflected the biogeography of the regions and can be representative enough to identify rare Red-listed species in particular areas. Some of the studied species are listed as endangered in national and prefectural Red Lists which prohibits the capture, holding, receiving and giving off, and other interactions with the species without the prefectural governor’s permission. Given the rarity of these threatened species in some regions, ‘gyotaku’ are probably important vouchers for estimating historical population status and factors of decline or extinction.

“Overall, the species composition displayed in the ‘gyotaku’ approximately reflected the fish faunas of each biogeographic region. We suggest that Japanese recreational fishers may be continuing to use the ‘gyotaku’ method in addition to digital photography to record their memorable catches” , concludes author of the research, Mr. Yusuke Miyazaki.


Gyotaku rubbing from the fish store in Miyazaki Prefecture
Credit: Yusuke Miyazaki
License: CC-BY 4.0

Gyotaku rubbing of the specimen from Kanagawa found in the shop in Tokyo
Credit: Yusuke Miyazaki
License: CC-BY 4.0

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Original source:

Miyazaki Y, Murase A (2019) Fish rubbings, ‘gyotaku’, as a source of historical biodiversity data. ZooKeys 904: 89-101. https://doi.org/10.3897/zookeys.904.47721

Wakanda Forever! Scientific divers describe new purple species of “twilight zone” fish from Africa

Named for Black Panther’s mythical nation of Wakanda, a dazzling new “Vibranium” Fairy Wrasse enchants with purple scales and a preference for deep, little-known mesophotic reefs up to 260 feet below the surface

Africa has new purple-clad warriors more than 200 feet beneath the ocean’s surface. Deep-diving scientists from the California Academy of Sciences’ Hope for Reefs initiative and the University of Sydney spotted dazzling fairy wrasses—previously unknown to science—in the dimly lit mesophotic coral reefs of eastern Zanzibar, off the coast of Tanzania. 

Preserved specimen of Vibranium fairy wrasse (Cirrhilabrus wakanda) retains its striking coloration.
Photo by Jon Fong © 2018 California Academy of Sciences.

The multicolored wrasses sport deep purple scales so pigmented, they even retain their color (which is typically lost) when preserved for research. The scientists name this “twilight zone” reef-dweller Cirrhilabrus wakanda (common name “Vibranium Fairy Wrasse”) in honor of the mythical nation of Wakanda from the Marvel Entertainment comics and movie Black Panther. The new fish is described in the open-access journal Zookeys.

Female specimen of Vibranium fairy wrasse (Cirrhilabrus wakanda) in its natural habitat (Zanzibar). Photo by Luiz Rocha © 2018 California Academy of Sciences.

Yi-Kai Tea, lead author and ichthyology PhD student from the University of Sydney, says:

“When we thought about the secretive and isolated nature of these unexplored African reefs, we knew we had to name this new species after Wakanda. We’ve known about other related fairy wrasses from the Indian Ocean, but always thought there was a missing species along the continent’s eastern edge. When I saw this amazing purple fish, I knew instantly we were dealing with the missing piece of the puzzle.”

The Academy scientists say Cirrhilabrus wakanda’s remote home in mesophotic coral reefs—below recreational diving limits—probably contributed to their long-hidden status in the shadows of the Indian Ocean. 

A California Academy diver on an expedition in the Indian Ocean.
Photo by Bart Shepherd © 2018 California Academy of Sciences.

Therefore, Hope for Reefs’ scientific divers are highly trained for the dangerous process of researching in these deep, little-known mesophotic reefs, located 200 to 500 feet beneath the ocean’s surface. Accessing them requires technical equipment and physically intense training well beyond that of shallow-water diving. The team’s special diving gear (known as closed-circuit rebreathers) includes multiple tanks with custom gas blends and electronic monitoring equipment that allow the divers to explore deep reefs for mere minutes before a lengthy, hours-long ascent to the surface.

Dr. Luiz Rocha, Academy Curator of Fishes and co-leader of the Hope for Reefs, comments:

“Preparation for these deep dives is very intense and our dive gear often weighs more than us. When we reach these reefs and find unknown species as spectacular as this fairy wrasse, it feels like our hard work is paying off.”

California Academy’s “twilight zone” dive gear prepped for Zanzibar.
Photo by Luiz Rocha © 2018 California Academy of Sciences.

Using a microscope, the team examined the specimens’ scales, fin rays, and body structures. DNA and morphological analyses revealed the new fairy wrasse to be different from the other seven species in the western Indian Ocean as well as other relatives in the Pacific. The new species’ common name is inspired by the fictional metal vibranium, a rare, and, according to Rocha, “totally awesome” substance found in the nation of Wakanda. The Vibranium Fairy Wrasse’s purple chain-link scale pattern reminded the scientists of Black Panther’s super-strong suit and the fabric motifs worn by Wakandans in the hit film.

Precious life in deep reefs

In a recent landmark paper, the Academy team found that twilight zone reefs are unique ecosystems bursting with life and are just as vulnerable to human threats as their shallow counterparts. Their findings upended the long-standing assumption that species might avoid human-related stressors on those deeper reefs. The Hope for Reefs team will continue to visit and study twilight zone sites around the world to shed light on these often-overlooked ecosystems.

Newly described Pohnpei fish (Liopropoma incandescens). Photo by Luiz Rocha © 2018 California Academy of Sciences.

In addition to this new fish from Zanzibar, Rocha and his colleagues recently published descriptions of mesophotic fish from Rapa Nui (Easter Island) and Micronesia. Luzonichthys kiomeamea is an orange, white, and sunny yellow dwarf anthias endemic to Rapa Nui, and the basslet Liopropoma incandescens (another new species published today in Zookeys) inhabits Pohnpei’s deep reefs—a neon orange and yellow specimen collected from a rocky slope 426 feet beneath the ocean’s surface.  

“It’s a time of global crisis for coral reefs, and exploring little-known habitats and the life they support is now more important than ever,” concludes Rocha. “Because they are out of sight, these deeper reefs are often left out of marine reserves, so we hope our discoveries inspire their protection.”

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(Text by the California Academy of Sciences, USA)

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Research articles:

Tea YK, Pinheiro HT, Shepherd B, Rocha LA (2019) Cirrhilabrus wakanda, a new species of fairy wrasse from mesophotic ecosystems of Zanzibar, Tanzania, Africa (Teleostei, Labridae). ZooKeys 863: 85–96. https://doi.org/10.3897/zookeys.863.35580.

Pinheiro HT, Shepherd B, Greene BD, Rocha LA (2019) Liopropoma incandescens sp. nov. (Epinephelidae, Liopropominae), a new species of basslet from mesophotic coral ecosystems of Pohnpei, Micronesia. ZooKeys 863: 97–106. https://doi.org/10.3897/zookeys.863.33778.