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All too often, researchers discover new species only to learn they are already at risk of extinction.
So when researchers from Shanghai Ocean University and Yunnan Agricultural University identified two new species from the upper Pearl River system in southwest China, they were likely unsurprised to find the fish facing major threats from pollution and overharvesting.
The new species, Beaufortia granulopinna and Beaufortia viridis, are members of the family Gastromyzontidae, also known as hillstream suck-loaches. They are highly specialised, with compressed bodies, flattened bottoms, and greatly expanded paired fins forming suction cup-like structures. These adaptations enable them to adhere to rocky substrates, resisting currents while feeding on algae and invertebrates.
Researchers discovered the new species during surveys studying aquatic life in various waterways in Yunnan and Guangxi between 2022 and 2024. The study, led by Jing-Chen Chen, offers new insights into the taxonomy and molecular phylogeny of the Beaufortia pingi species group, of which the two discoveries are likely members.
Although research on the Beaufortia pingi group is mostly in its initial stages, the situation is far from optimistic. These species have become popular ornamental fish in China, and aquarium trade operators reap substantial profits through their capture and sale. Among them are those who act with disregard for sustainability, using destructive harvesting practices.
Given the loaches’ preference for fast-flowing water, projects that obstruct rivers can easily lead to regional extinction. Their low pollution tolerance and sensitivity to changes in water quality also contribute to the significant reductions in population that many species are suffering.
In the habitat of B. viridis, Wuming District, Nanning City, most small tributaries have been modified into step-like reservoirs for water storage, and those near agricultural irrigation areas are polluted, rendering these areas unsuitable for their survival. Interestingly, however, a stable population was discovered inside a commercial eco-camping site left untouched to satisfy consumers’ pursuit of “pristine nature.”
The researchers suggest that future efforts should focus on increasing attention to these species, conducting fundamental research, and further exploring their scientific and economic potential. Simultaneously, it is crucial to enhance habitat conservation awareness, scientifically plan, and develop sustainably, ensuring harmonious coexistence between humans and nature.
Original source
Chen J-C, Li J-J, Tang W-Q, Pu X-R, Lei H-T (2024) Taxonomic resolution of the hillstream suck-loach Beaufortia pingi species group (Cypriniformes, Gastromyzontidae) and two new species from Southwest China– Beaufortia granulopinna and Beaufortia viridis. Zoosystematics and Evolution 100(3): 941-963. https://doi.org/10.3897/zse.100.124370
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