Tiny stream invaders may harm Western trout

Ring, Baya; Vaiente, Lara
February 2006
High Country News;2/6/2006, Vol. 38 Issue 2, p4
The article focuses on the environmental impact of the New Zealand mud snails to the population decline of the Western trouts in western U.S. Dave Richards of the consulting firm EcoAnalysts have devised methods to control the proliferation of such snails. Significantly, the mud snails are controlled by parasites and predators that don't exist in the U.S. and are only present in New Zealand. The proliferates faster and its degree of dominance also threatens the ecological balance. Furthermore, wildlife agencies have temporarily banned fishing on a few streams in Montana, California, and Colorado in an effort to reduce the chances of spreading the snails. Researchers are hoping that they can develop biological controls for the snails.


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