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Management of Indigenous Fish Species Impacted by Introduced Mosquitofish: An Experimental Approach

Charles Lydeard and Mark C. Belk
The Southwestern Naturalist
Vol. 38, No. 4 (Dec., 1993), pp. 370-373
DOI: 10.2307/3671617
Stable URL: http://www.jstor.org/stable/3671617
Page Count: 4
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Management of Indigenous Fish Species Impacted by Introduced Mosquitofish: An Experimental Approach
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Abstract

The negative effects of introduced mosquitofish (Gambusia affinis) on native fishes of the American Southwest have been well documented. However, little experimental information is available to determine the level to which populations of Gambusia must be reduced before reintroducing native species. To simulate various options for managing indigenous fishes impacted by mosquitofish, we observed population growth of the least killifish (Heterandria formosa) with different starting densities of the eastern mosquitofish (Gambusia holbrooki) in replicate mesocosms. The presence of mosquitofish at all densities examined had a significant negative effect on population growth of least killifish. Therefore, complete removal of introduced mosquitofish appears to be the best management option for maintaining populations of native fishes.

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