During the years of 1980/80 was performed a ecological study in Ribeira Bay (Angra dos Reis-R.J.-Brazil) in order to provide informations about of the planktonic community in pre-operational conditions, in the region of the Admiral Álvaro Aberto Nuclear Power Plant (C.N.A.A.A.). After 10 years of activities of the Nuclear Power Plant the zooplankton material was obtained in vertical hauls with a net of 150 μm at two fixed points (Piraquara de Fora Cove and Itaorna Beach) in order to study the zooplankton associations related to environmental variables and comparing with the anterior study. The zooplankton evolution showed a sazonal variation with the dominance of the holoplanktonic organisms. The Copepoda showed its the greatest growth during the autumn and the winter. During the summer and the spring its relative abundance suffered a progressive diminution when the Cladocera passed to be the more representative organisms without a competition between its. The sazonal variation presented by the organisms was related with the raining period that fall in the region.
Zooplâncton; Rio de Janeiro; Usina Térmica; Sazonal Variation
