| Reintroduced in 1968. Contributed to the decline of native Orestias populations. Originally introduced into Lake Titicaca where it formed a large fishery but later stocks were reduced due to overfishing and bad environmental management. The introduction of salmonids according to Wursbansk and Tapia (1988) caused the death of 18 million of Orestias spp, endemic type of highlands, through the introduction of Pracito itchtyophthirius. Some biologists also consider the trout responsible for the extinction of the two species "pelagicas de Orestias el O. cuvieri and O. pentlandii". According to R. Laba (1979) with the introduction of the trout, new art of fishing was established like the gill net and hook, the use of nets was anarchic thus causing the extermination of the species. At present the trout of the river is in way of extinction due to the overfishing and forbidden fishing in the principal rivers where they reproduce themselves. Trout is biologically controlling the mackerel in the lake Titicaca. The reproduction of the trout arco is artificial and eggs and embryos are imported from the US.
Ref:
FAO, 1997
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