Review article

ASSESSMENT METHODS OF CORMORANT (Phalacrocorax carbo) DIET

Krešimir Terzić
Anđelko Opačak ; Chair for wildlife, fishery and beekeping, Department for wildlife, fishery and ecology, Faculty of Agriculture, Josip Juraj Strossmayer University of Osijek, Trg Sv. Trojstva 3, Osijek
Dinko Jelkić ; Chair for wildlife, fishery and beekeping, Department for wildlife, fishery and ecology, Faculty of Agriculture, Josip Juraj Strossmayer University of Osijek, Trg Sv. Trojstva 3, Osijek
Tihomir Florijančić ; Chair for wildlife, fishery and beekeping, Department for wildlife, fishery and ecology, Faculty of Agriculture, Josip Juraj Strossmayer University of Osijek, Trg Sv. Trojstva 3, Osijek

Abstract

Various cormorant diet assessment methods are used to assess their daily meal in order to evaluate, using these and other data, the damage to commercial fish farms as well as the damage on open waters caused by cormorants. All of the parameters used for evaluating the damage to fish stock (number of birds, density and fish structure, daily meal, fish price, degree of protection and preservation etc.) are specific for an individual fishpond or other body of water and can only be used for that locality and not elsewhere. The results on the lowest and highest values of fish mass that cormorants eat daily vary extensively. By examining the available literature, the following values for individual adults have been determined: pellets — 347 g, pellets of captive cormorants — 371 g, stomach content — 359.5 g, regurgitations — 260 to 539 g, energy requirements — 751 g, stomach temperature — 336±98 g.

Keywords

assessment methods; diet; cormorant, Phalacrocorax carbo

Hrčak ID:

30582

URI

https://hrcak.srce.hr/30582

Publication date:

19.12.2008.

Article data in other languages: croatian

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