Now Reading: Spain’s Wels catfish invasion grows from 1974 river release
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Spain’s Wels catfish invasion grows from 1974 river release
Wels catfish released into Spain’s Ebro River in 1974 have spread across much of the basin and into other rivers and reservoirs, forming populations wildlife managers consider virtually impossible to eliminate, The…
The Story in Brief
Wels catfish released into Spain’s Ebro River in 1974 have spread across much of the basin and into other rivers and reservoirs, forming populations wildlife managers consider virtually impossible to eliminate, The Times of India reports. The fish can grow beyond 2.5 metres and weigh over 200 kg. It eats fish, crayfish, frogs, water birds and small mammals.
The predator now threatens migratory species including Allis shad and Atlantic salmon, already hit by pollution and habitat loss. University of Córdoba zoology professor Carlos Fernández Delgado calls it an “ecological time bomb”. Warming waters may help it move upstream and colonise rivers in Belgium and the Netherlands. Spanish law bans its release and transport, but catch-and-release fishing has limited support for removal.
The Indian Opinion
The lazy story is that anglers alone caused an ecological disaster, or that conservationists simply want to end fishing. The facts are less neat. A well-meant introduction created a lasting risk, while the species now supports a fishing economy and cannot realistically be removed. The useful test is whether Spain can protect threatened migratory fish as catfish spread upstream, not whether every fish can be caught.
Source: timesofindia.indiatimes.com
This story was synthesised by AI from the source linked above.
