Diet, prey selection, and growth of larval and juvenile burbotLota lota(L.)
作者:
D. Ghan,
W. G. Sprules,
期刊:
Journal of Fish Biology
(WILEY Available online 1993)
卷期:
Volume 42,
issue 1
页码: 47-64
ISSN:0022-1112
年代: 1993
DOI:10.1111/j.1095-8649.1993.tb00305.x
出版商: Blackwell Publishing Ltd
关键词: burbot;Lota lota;diet;prey selection;Oncida Lake
数据来源: WILEY
摘要:
The diet, prey selection, and growth of larval and juvenile Oneida Lake burbot,Lota lota(L.), was investigated from the time of first hatch in mid‐April until their disappearance from the pelagic zone at the beginning of June. Mean length increased exponentially from 3–20 mm on 18 April to 15–00 mm on 29 May. The number and size of prey in burbot stomachs, and the prey size most selected by burbot increased as they grew. Prey width, not prey length, limited the size of prey ingested. The smallest burbot ate and selected highly for the largest prey they could ingest, but older burbot did not. As burbot grew, prey selection was highest first for the rotiferAsplanchna, followed by copepod nauplii, then cyclopoid copepods.Daphniaand calanoid copepods and cyclopoid copepods were selected to similar degrees by 29 May. For a given size, however, cyciopoid copepods were selected more strongly than any other prey type from 18 to 29 May. There were no significant differences in prey selection among offshore, nearshore, and onshore habitats, nor among depths in the offshore ha
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