![]() ![]() In addition to that, this kind of research can provide relevant data to improve the capture of these animals, considering their economy and social importance. The knowledge of natural fish feeding is important to understand the species feeding habits and how they interact with the environment. It is concluded that species of Callorhinchus can be generally characterized as benthic foragers that specialize in crushing shelled invertebrate prey. ![]() The diet of the cockfish is compared with that of other holocephalans. Size-selective foraging on two species of scallops, Aequipecten tehuelchus (subject to commercial fishing) and Zygochlamys patagonica, was found in adults it is argued that maximum scallop prey size is constrained by the strength of the crushing apparatus of the cockfish. Differences in food composition between sexes and between juveniles and adults are attributed to two factors: extrinsic (concerning prey availability) and intrinsic (concerning the morphology and behaviour of the predator). Pandora cistula), amphipods and polychaetes. The diet of juveniles consisted of small gastropods (Olivella sp.), bivalves with fragile shells (e.g. The scallop Zygochlamys patagonica dominated the diet of females. Three species of bivalve molluscs (Pitar rostratus, Aequipecten tehuelchus and Ennucula puelcha) and flabelligerid polychaetes were predominant in the diet of males. Composition of the diet and size-selective foraging of this species on scallops was studied in northern Patagonian waters and analysed in relation to depth, sex and size. Morphology of the main digestive features of cockfish, Callorhinchus callorhynchus, is described and linked to feeding habits.
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