Diet and growth of the endangered Zingel asper in the Durance River

Annual monitoring of the apron Zingel asper in the Durance River, a tributary of the Rhône 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 (...

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Bibliographic Details
Published in:Journal of fish biology 2003-08, Vol.63 (2), p.460-471
Main Authors: Cavalli, L., Pech, N., Chappaz, R.
Format: Article
Language:English
Subjects:
Agnatha. Pisces
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Autoecology
Biological and medical sciences
diet
Diptera
endangered fishes
Ephemeroptera
Freshwater
Fundamental and applied biological sciences. Psychology
growth
periodicity
Trichoptera
Vertebrata
Zingel asper
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Summary:Annual monitoring of the apron Zingel asper in the Durance River, a tributary of the Rhône 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.
ISSN:0022-1112
1095-8649
DOI:10.1046/j.1095-8649.2003.00168.x