Naslov
Diet spectrum of great cormorants (Phalacrocorax carbo sinensis L.) at the Donji Miholjac carp fishponds in eastern Croatia

Autori
Opačak, Anđelko ; Florijančić, Tihomir ; Horvat, Dražen ; Ozimec, Siniša ; Bodakoš, Dragutin

Izvornik
European Journal of Wildlife Research (1612-4642) 50 (2004), 4; 173-178

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
great cormorant (Phalacrocorax carbo sinensis L.) ; diet ; carp ; fishponds

Sažetak
This paper reports the results of a diet analysis from the digestive tracts of 203 great cormorants shot at the Donji Miholjac fishponds in eastern Croatia, in the period 2000– 2002. Eight fish species were determined. The dominant species was common carp (Cyprinus carpio) with a relative frequency of 73.4%, followed by grass carp (Ctenopharingodon idella) (11.6%), bighead carp (Aristichthys nobilis) (7.2%), pikeperch (Sander lucioperca) (2.0%), wels catfish (Silurus glanis) (1.7%), pike (Esox lucius) (1.5%), topmouth gudgeon (Pseudorasbora parva) (1.5%) and Prussian carp (Carassius auratus gibelio) (1.1%). The diet spectrum of the great cormorants from the Donji Miholjac fishponds was in accordance with the structure of the fish population in the fishponds. The average stomach weight per bird was 244 g. When birds shot with an empty stomach were excluded, the average stomach weight increased to 286 g. The length of consumed fish ranged from 40– 335 mm, with 47% of the fish belonging to the length category 100– 149 mm. The study revealed no significant relationship between the weight of the consumed fish and the body weight of male and female cormorants.

Izvorni jezik
Engleski

Znanstvena područja
Veterinarska medicina, Poljoprivreda (agronomija)

POVEZANOST RADA