La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	The diet of Great Cormorant Phalacrocorax carbo on the upper Sava river in the winter of 1998/99 (Slovenia)
Auteurs :	Marijan Govedic, Auteur
Type de document :	Article
Dans :	Acrocephalus (23(115) 2002)
Article en page(s) :	169-178
Résumé :	The diet of Great Cormorant Phalacrocorax carbo, occurring on the upper Sava river, was studied in the second half of the winter 1998/99 by means of regurgitated pellets, collected at the Great Cormorants' night roost near Radovljica. Among 99 collected pellets, 73 contained remains of fish. In individual pellets, remains of I to I I fish (median 2, average 2.8) were found. Altogether, remains of 204 fish were found. Length and weight were determined for 178 of them. The diet consisted of seven fish species (Grayling Thymallus thymallus, Trout Salmo trutta, Chub Leuciscus cephalus, Perch Perca fluviatilis, Danube Roach Rutilus pigus virgo, Rainbow Trout Oncorhynchus mykiss, and Roach Rutilus rutilus). The diet was dominated by Grayling (51.0% by number, 64.3% by biomass and 69.9% by occurrence), Trout (21.1% by number, 9.7% by biomass, and 34.3% by occurrence) and Chub (9.3% by number, 14.4% by biomass, and 13.7% by occurrence). Prey size ranged from 3.7 cm (undetermined Cyprinidae) to 40.8 cm (Grayling) and mass from

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