Preliminary study of Limnology in the Moghan Lake, Ardabil state

Ardebil province in north western of Iran has extensive a great number of nature lakes. Freshwater Lakes are very important water bodies in point of view of agriculture, drinking waters and aquaculture. Sampling of biotic and abiotic factors at station 4 in Moghan Lake was done in August and September 2006. The survey showed, 3 groups and 13 genera of zooplankton identified which consisted of Rotatoria (7 genus), Protozoa (5 genus), and Arthropoda (1 genus). The benthic organisms, were comprised Chironomidae, Oligochaeta, Odonata, Sphaerium and Hydropsychidae. The Oligochaeta constitute the most abundance in all stations. The average biomass of benthos measured 18.7 g.m2 in the Moghan Lake. Twelve species of fish were identified in Moghan Lake. The 9 species belongs to Cyprinidae family and other species belongs to Siluridae, Percidae and Gobiidae. Abramis brama and Hemiculter leucisculus had the highest abundance with the genus of 35.6 and 23.4 % and the lowest of fish abundance belong to Silver Carp and Gobiidae with the value of 0.2 %. This survey showed the structure of aquatic invertebrate and fish communities. For potential estimation and sustainable development of the lake have to continue more study in the ecosystem.