Study on Quality and Abundance of Zooplankton in Surface Offshore Waters of Southern Part of Caspian Sea

In this study diversity and abundance of zooplankton in south Caspian Sea offshore waters were investigated. During the first season of oceanographic cruise in winter2014 at southern part of Caspian Sea, 8 stations at offshore waters of south Caspian Sea were selected. Totally, 4 Holopelankton and 6 meroplankton were identified. Among the identified zooplanktonic groups, Copepods were the main zooplanktonicgroup that constituted about 53% of total abundance and 65% of total biomass. They were dominant in all stations. Predominant species of copepods was Acartia tonsa. Itsabundance was between (106±42 ind.m-3) and (1545±181 ind.m-3). After A. tonsa,lamellibranch larvae had the highest abundance in all stations (18%) and fish larvae was at second place in terms of biomass (27%). Results showed after invasion of M.leidyi, composition and abundance of zooplankton in south Caspian Sea waters greatly changed

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