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标题：Foraging and Prey Selection by Bluespotted Sunfish Enneacanthus gloriosus (Holbrook) in Backwater, Vegetated Ponds in Coastal Mississippi
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作者：Douglas J. Snyder ; Mark S. Peterson
期刊名称：Journal of Freshwater Ecology
印刷版ISSN：0270-5060
电子版ISSN：2156-6941
出版年度：1999
卷号：14
期号：2
页码：187-196
DOI：10.1080/02705060.1999.9663670
出版社：Taylor & Francis
摘要：Bluespotted sunfish are diurnal foragers in coastal Mississippi preying mainly on cyclopoid copepods, amphipods, cladocerans, chironomids, ostracods, and gastropods. Cyclopoid copepods, cladocerans, chironomid larvae and oligochaetes were collected in submersed aquatic vegetation (SAV)/SAV-associated sediments throughout the year but were most abundant in the warm (April-September) months. Ostracods, amphipods, and hydracarinids were also collected in SAVISAV-associated sediments throughout the year but tended to be most abundant during fall, winter and early spring (October-April). Fish ≥ 20 mm standard length (SL) selected 87.5% of the available prey from SAV/SAV-associated benthos compared to fish < 20 mm SL, which selected only 40%. Mean annual electivity values suggested random prey selection. The only obvious difference in diet was that fish ≥ 20 mm SL consumed gastropods and amphipods while fish < 20 mm SL rarely consumed amphipods and never consumed gastropods. Bluespotted sunfish exhibit an opportunistic feeding behavior and apparently feed outside the SAV when small but shift into SAV as they grow.