Abstract
The physicochemical features and species composition and density of zooplankton of Koprucay estuary investigated monthly sampling from selected 5 stations between January and December, 2009. In this study, Zooplankton which are Rotifera (20), Cladocera (6), Copepoda (34), and Cnidaria, Tubilariidae, Foraminifera, Tintinida, Cirripedia, Gastropoda, Polychaeta, Chaetognatha, Decapoda, Ichthyoplankton one of each of determined 70 taxons in Koprucay River estuarin zone. The dominant taxa in Koprucay River estuarin zone consist of Oithona nana, Clausocalanus arcuicornis, Acartia discaudata, Paracalanus parvus, Euchlanis dilatata and Cephalodella gibba and these species are eurohalin character types of zooplankton. In Koprucay River estuarin zone, the highest and the lowest Copepoda density semptember (25627.33 ±8369 ind./m 3 ) and february (3050 ±1701 ind./m 3 ), ; the highest and the lowest Rotifera density january (12152 ±6835 ind./m 3) and september (187 ±76 ind./m 3 ); the highest and the lowest Cladocera density august (2687 ±604 ind./m 3 ) and february (0 ±0 ind./m 3 ); the highest and the lowest other organisms february (3226,33 ±586 ind./m 3 ) and may (648 ±178 ind./m 3 ), respectively. This article was prepared from the doctoral thesis.
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