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ICES Journal of Marine Science: Journal du Conseil 2000 57(3):641-648; doi:10.1006/jmsc.2000.0736
© 2000 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Effects of gelatinous plankton on Black Sea and Sea of Azov fish and their food resources

Tamara A. Shiganova and Yulia V. Bulgakova

P. P. Shirshov Institute of Oceanology, Russian Academy of Sciences 36, Nakhimovskiy pr., 117851 Moscow, Russia [e-mail: shiganov{at}ecosys.sio.rssi.ru, juliabul{at}ecosys.sio.rssi.ru]

We describe the effect of gelatinous plankton – Aurelia aurita and invaders Mnemiopsis leidyi and Beroe ovata – on fish (eggs, larvae, feeding, and stocks) in the Black Sea and Sea of Azov, based on field data and the relevant literature. Representatives of three ecological groups of fish were chosen as examples: planktivorous anchovy typical of warm-water conditions, planktivorous sprat of temperate waters, and benthivorous and piscivorous Black Sea whiting of temperate waters. Changes were noticeable in all three groups, particularly after the invasion of the ctenophore Mnemiopsis leidyi. When the density of the latter decreased, some improvements in fish stocks were recorded, which increased after the invasion of Beroe ovata, predator of Mnemiopsis.

Keywords: Azov Sea, Beroe ovata, Black Sea, fish feeding, fish stocks, gelatinous plankton, ichthyoplankton, Mnemiopsis leidyi, zooplankton


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