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Food of freshwater drum in western Lake Erie

Journal of Great Lakes Research

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Abstract

The abundance of freshwater drum (Aplodinotus grunniens) suggests they play an important role in the Lake Erie ecosystem. Our analysis of freshwater drum digestive tracts and macrobenthic samples collected from western Lake Erie indicates that drum were selective feeders. Planktonic cladocerans and larval midges (Chironomidae) were the primary prey organisms eaten by drum. Young-of-the-year fed mostly on cladocerans, while yearling and older drum ate both cladocerans and midge larvae. Decapods, pelecypods, and fish were found only in the digestive tracts of drum longer than 250 mm. While the most abundant organisms in benthic samples were cladocerans (ephippial) and oligochaetes (89.5% by number), they constituted less than 1% of the diet. An evaluation of food selectivity, using Ivlev's index of electivity for benthic organisms, indicated that adult drum preferred midges to any other benthic food.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Food of freshwater drum in western Lake Erie
Series title:
Journal of Great Lakes Research
Volume
8
Issue:
4
Year Published:
1982
Language:
English
Contributing office(s):
Great Lakes Science Center
Description:
p. 672-675
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Great Lakes Research
First page:
672
Last page:
675
Number of Pages:
3