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Feeding spectrum of squid Sthenoteuthis oualaniensis (Oegopsida) in the eastern Pacific

Published online by Cambridge University Press:  11 May 2009

A. S. Shchetinnikov
A. S. Shchetinnikov
Affiliation:
Laboratory of Commercial Invertebrates, Atlantic Research Institute of Marine Fisheries and Oceanology, Dmitry Donskoy Street, 236000 Kaliningrad, Russia
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Extract

The stomach contents of 235 specimens of the squid Sthenoteuthis oualaniensis (4·3–36·5 cm mantle length, ML) were examined. A detailed list of 60 species of prey, comprising young and adult squid, is given together with their frequency of occurrence and proportional contribution. The size and number of each food item was investigated. Three ontogenetic size-groups of S. oualaniensis were distinguished: I, fry and young (4–10 cm ML), micronektonic epipelagic plankton-eaters; II, transient critical size group (10–15 cm ML), converting from feeding on planktonic crustaceans and fish larvae to myctophid fishes; III, medium-sized (adult) nyctoepipelagic nektonic predators (15–36·5 cm ML), feeding primarily on myctophids and secondarily on squid. Myctophids (genera Symbolophorus, Myctophum and Hygophum) were the most abundant prey in the diet of adult S. oualaniensis from different parts of its distribution.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 72 , Issue 4 , November 1992 , pp. 849 - 860
Copyright
Copyright © Marine Biological Association of the United Kingdom 1992

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