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Diet of double-crested cormorants wintering in Texas

Journal of Field Ornithology

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Abstract

The diets of 420 Double-crested Cormorants (Phalacrocorax auritus) were studied during November 1986-March 1987 on eight public reservoirs in Texas. Prey included 29 fish species and the mean live weight of fish per bird was 122 g. Fishes a??415 mm long were ingested, but those a??125 mm accounted for 90% of cormorant food contents by number. Shad (Dorosoma spp.) and sunfishes (Lepomis spp.) accounted for 90% of the total food items by number. Consumption of fishes (percent by weight) was different for male vs. female and adult vs. juvenile cormorants. Total consumption of fish by weight was consistent throughout the period; however, fewer but much larger fish were consumed after 15 February. Cormorants ate fishes that were most abundant in reservoirs. Sport fishes made up a substantial portion of cormorant food by weight, but not by number on some reservoirs. Cormorants ate very few large sport fish, however.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Diet of double-crested cormorants wintering in Texas
Series title:
Journal of Field Ornithology
Volume
64
Year Published:
1993
Language:
English
Contributing office(s):
Upper Midwest Environmental Sciences Center
Description:
pp. 136-144
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Field Ornithology
First page:
136
Last page:
144