Growth,survival, and foraging abilities of early life history stages of blue tilapia,Oreochromis aureus,and largemouth bass,Micropterus salmoides |
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| Authors: | Alexander V Zale |
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| Institution: | (1) Florida Cooperative Fish and Wildlife Research Unit, School of Forest Resources and Conservation, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL, 32611, U.S.A.;(2) Present address: Oklahoma Cooperative Fish and Wildlife Research Unit, Department of Zoology, Oklahoma State University, 404 Life Sciences West, Stillwater, OK, 74078, U.S.A. |
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| Abstract: | Synopsis I compared growth, survival, and foraging abilities of early life history stages of blue tilapia,Oreochromis (=Sarotherodon = Tilapia) aureus, and largemouth bass,Micropterus salmoides, at equivalent prey (zooplankton) densities in the laboratory. Survival and growth of blue tilapia exceeded those of largemouth bass and, at comparable ages, blue tilapia were superior to largemouth bass in ability to prey on zooplankton; the enhanced survival and growth of blue tilapia appeared to result from their larger initial (egg) size. Predatory abilities of the species at equivalent sizes were similar. The success of blue tilapia in colonizing new systems and rapidly achieving high abundances in Florida may be a consequence of large initial size. |
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| Keywords: | Cichlidae Centrarchidae Exotic fish Zooplankton Life history tactics Mouthbrooding Egg size Trophic ecology Early life survival |
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