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.
Photos by Ivan Mikolji.