Extinct Tequila Fish is being reintroduced to rivers in Jalisco, Mexico

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There once was a small fish called “tequila splitfin” or “Zoogoneticus Tequila” that swam in a river in western Mexico, but disappeared in the 1990s.

Scientists and residents, however, have achieved the return of a species extinct in nature — but conserved in captivity — to its native habitat. Its success is now intertwined with the community’s identity and being touted internationally.

It began more than two decades ago in Teuchitlán, a town near the Tequila volcano.

A half-dozen students, among them Omar Domínguez, began to worry about the little fish that fit in the palm of a hand and had only ever been seen in the Teuchitlán river. It had vanished from local waters, apparently due to pollution, human activities and the introduction of non-native species.

Domínguez, now a 47-year-old researcher at the University of Michoacán, says that then only the elderly remembered the fish called “gallito” or “little rooster” because of its orange tail. In 1998, conservationists from the Chester Zoo in England and other European institutions arrived to help set up a laboratory for conserving Mexican fish.

They brought several pairs of tequila splitfin fish from the aquariums of collectors, Domínguez said.

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, (that) when we returned them they were going to die.”

So they looked for options. They built an artificial pond for a semi-captivity stage and in 2012 they put 40 pairs there.

Two years later, there were some 10,000 fish. The result guaranteed funding, not only from the Chester Zoo but also a dozen organizations from Europe, the United States, and the United Arab Emirates, to move the experiment to the river.

There they studied parasites, microorganisms in the water, the interaction with predators, competition with other fish, and then introduced the fish in floating cages. The goal was to re-establish the fragile equilibrium.

For that part, the key was not so much the scientists as the local residents.

Source: Eje Central

The Guadalajara Post