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Providing evidence to improve practice

Individual study: Fish elimination using rotenone resulted in a rapid increase in a smooth newt population in a lake in south western Sweden.

Published source details

Aronsson S. & Stenson J.A.E. (1995) Newt-fish interactions in a small forest lake. Amphibia-Reptilia, 16, 177-184


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Remove or control fish using rotenone Amphibian Conservation

A controlled study in 1977–1984 in two lakes in south western Sweden (Aronsson & Stenson 1995) found that fish elimination using rotenone resulted in a rapid increase in the smooth newt Triturus vulgaris population. Newts colonized within two years of fish removal. Between 1977 and 1980 the breeding population increased from 2,000 to almost 10,000 individuals. Following fish stocking in 1979 with 2,000 roach Rutilus rutilus, newt numbers declined to below 900 by 1984. No newts were found in an adjacent (50 m) lake without fish removal. Rotenone was applied in 1973. Newts were sampled using a capture-recapture survey from May to June in 1977–1984. Forty-two cage traps were uniformly distributed around the removal lake. Traps were set in the untreated lake from 1978–1983.