A fish dubbed “gallito” or “little rooster” because of its orange tail lived in just one place: the Teuchitlán River in Mexico. The species had disappeared from the wild by the 1990s, but scientists and local residents have helped bring it back.
The fish began reproducing in aquariums and within a few years Domínguez and his colleagues gambled on reintroducing them to the Teuchitlán river. “They told us it was impossible, when we returned them they were going to die.”
There they studied parasites, microorganisms in the water, the interaction with predators, competition with other fish, and then introduced the fish in floating cages. But the conservationists succeeded with patience and years of puppet shows, games and explanations about the ecological and health value of “zoogoneticus tequila” — the fish help control mosquitos that spread dengue.
The reintroduction into nature of species that were extinct in the wild is complex and time-consuming. Przewalski’s horse and the Arabian oryx are among successful examples. The Chester Zoo said Dec. 29 that the tequila splitfin had joined that small group.
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