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Diet composition of adult twaite shad (Alosa fallax) in the Aegean Sea (Izmir Bay, Turkey)

Published online by Cambridge University Press:  09 June 2011

Tevfik Ceyhan ,
Okan Akyol ,
T. Murat Sever  and
Ali Kara
Tevfik Ceyhan*
Affiliation:
Ege University Faculty of Fisheries, TR-35100 Bornova, Izmir, Turkey
Okan Akyol
Affiliation:
Ege University Faculty of Fisheries, TR-35100 Bornova, Izmir, Turkey
T. Murat Sever
Affiliation:
Ege University Faculty of Fisheries, TR-35100 Bornova, Izmir, Turkey
Ali Kara
Affiliation:
Ege University Faculty of Fisheries, TR-35100 Bornova, Izmir, Turkey
*
Correspondence should be addressed to: T. Ceyhan, Ege University Faculty of Fisheries, TR-35100 Bornova, Izmir, Turkey email: [email protected]
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Abstract

Specimens of twaite shad, Alosa fallax were sampled from commercial purse seiners and trammel netters in Izmir Bay during November and December 2007. A total of 287 prey items from 14 taxa from 208 stomachs were recorded. The primary food of twaite shad was found to be fish, especially anchovy Engraulis encrasicolus, which was the most frequent (%F = 66.11) and abundant (%N = 63.64) prey item, and also had the highest percentage by weight (%W = 81.91). Decapoda, Isopoda, Ostracoda and Copepoda (Calanus spp., Candocia armata, Temora stylifera from Calanoida and Corycaeus spp. from Cyclopodia), were recorded occasionally with low values for all indices. The study showed that in the Aegean Sea Alosa fallax is a predator of small pelagic fish, E. encrasicolus, A. boyeri, S. pilchardus, and some crustaceans. Benthopelagic P. acarne and demersal S. hepatus were first recorded in diet of twaite shad.

Keywords

twaite shadAlosa fallaxdiet compositionIzmir BayAegean Sea
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 92 , Issue 3 , May 2012 , pp. 601 - 604
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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