UK zoo helps lost Mexican fish live to see another Tequila sunrise
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Loading... - Simon Sterling
- 30 Dec 2021
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A “charismatic little fish” declared extinct in the wild has been reintroduced to its native Mexico after being bred in an aquarium at Chester zoo.
The tequila fish (Zoogoneticus tequila), which grows to no bigger than 70mm long, disappeared from the wild in 2003 owing to the introduction of invasive, exotic fish species and water pollution.
Named after the Tequila volcano, which looms north of its native habitat, the species was discovered in 1990 in the Teuchitlán River in Jalisco, south-west Mexico.
Now conservationists at Chester zoo and the Michoacana University of Mexico have teamed up to return more than 1,500 fish to the river in a project cited as an International Union for Conservation of Nature (IUCN) case study for successful reintroductions.
Recent studies have confirmed that the fish are thriving and already breeding in the Teuchitlán. Experts say it has created a blueprint for future reintroductions of other highly endangered fish species, with a rescue mission for another, the golden skiffia (Skiffia francesae), now under way.
Prof Omar Dominguez, of the Michoacana University of Mexico, said: “This is the first time an extinct species of fish has ever been successfully reintroduced in Mexico and so it’s a real landmark for conservation. It’s a project which has now set an important precedent for the future conservation of the many fish species in the country that are threatened or even extinct in the wild but which rarely take our attention.”
In 1998, at the outset of the project, the university’s aquatic biology unit received five pairs of fish from Chester zoo. These 10 fish founded a new colony in the university’s laboratory, which experts maintained and expanded over the next 15 years.
In preparation for the reintroduction, 40 males and 40 females from the colony were released into large, artificial ponds at the university. This exposed them to a semi-natural environment where they would encounter fluctuating resources, potential competitors, parasites, and predators such as birds, turtles and snakes. After four years, this population was estimated to have increased to 10,000 individuals and became the source for the reintroduction to the wild.
A long-term monitoring programme was established involving local people trained to assess water and habitat quality. Read More…
