Journal
JOURNAL OF FISH BIOLOGY
Volume 63, Issue 2, Pages 460-471Publisher
BLACKWELL PUBLISHING LTD
DOI: 10.1046/j.1095-8649.2003.00168.x
Keywords
diet; endangered fishes; growth; periodicity; Zingel asper
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Annual monitoring of the apron Zingel asper in the Durance River, a tributary of the Rhone in which the fish is endemic, indicated its narrow diet range. Three types of prey made up the basic diet: Diptera (Simulidae and Chironomidae), mainly in winter, and Ephemeroptera (Baetidae) and Trichoptera (Hydropsychidae), during the rest of the year. Although some potential prey (Coleoptera and Gammaridae) were present in the substratum, they were not found in the stomach contents of the apron. In spring specific food items (Heptageneidae) appeared to be actively searched for as indicated by stomach contents. This period coincided with the renewal of growth. More than 80% of the annual occurred before the beginning of autumn. (C) 2003 The Fisheries Society of the British Isles.
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