Feeding of the Caspian shad Alosa caspia (Eichwald, 1838) in the western part of the Caspian Sea
Abstract
Seasonal changes in feeding of Caspian shad Alosa caspia (Eichw.) inhabiting western part of Caspian Sea were studied. Quantitative and qualitative features of its food spectrum, depending on different seasons of the year are given. It is established, that throughout the year the main food of this species is presented by Copepoda and Mysidacea, while other groups of crustaceans are represented insignificantly. Importance of certain species of copepods and misids in food of fishes is influenced by their ecological, morphological and functional peculiarities. Food spectrum of Alosa caspia is related to its life cycle and migration of zooplankton. Caspian shad feeds most intensively in spring before spawning (March – April) and in the middle summer (July) after spawning. Compared to other seasons of the year in the summer time Caspian shad expanded its range that encompassed the whole western part of Caspian Sea.
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