'This release is significant, but it is just the first step of many actions that will be needed for the long-term recovery of these giant fish,” says InsideNatGeo Explorer Zeb Hogan
, which flows through six countries. The Mekong Basin is a global biodiversity hotspot, home to almost 1,000 freshwater fish species, including the world’s largest.Photograph courtesy Zeb HoganLarge freshwater fish are among the most threatened animals globally, studies show.
In contrast, the fish released this month were reared at an aquatic research center in southeastern Cambodia—but weren’t bred there. They were collected in the wild when they were so tiny their species could not be distinguished. Such projects “cannot just stock a higher number of fish, even though this approach is the easiest,” says Jennifer Cochran-Biederman, a biology professor at Saint Mary’s University of Minnesota, and the lead author of that study. “They must tackle broader causes of habitat degradation, such as pollution, climate change, urban development, and dams, which is much more complicated.”
The main threat to fish in the lake, where communal fisheries employ hundreds of thousands of people, is overfishing. The use of illegal fishing nets and other gear is widespread—in fact, it’s not even hidden. Large ocean-going fishing vessels have increasingly been seen operating in the lake using huge trawling nets, in violation of fishing regulations.
Tach Phanara and a colleague from the Cambodian Fisheries Administration collect a DNA sample from a striped river catfish prior to releasing it into the Tonle Sap.Community effort
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