عنوان مقاله [English]
In order to identify, density and distribution of zooplankton and its changes over from winter 2009 to summer 2010 in the 3-stage sampling was performed. A sample stuck with huge plankton net 55 microns (Judy Net) was performed, than 4% formalin fixed samples of an inverted microscope in a laboratory study. Investigation totally distinguished 31 Genus in 6 Phylums among of genus. In this regard, the following series of Protozoa and branches Rhizopoda 5 genus, Ciliophora 2 genus, branch of Gastrotricha 1 genus, Nematoda phylum 20 genera Rotatoria branch and the branch Arthropoda and the order Cladocera 2 genus with embryonic stage and the category Copepoda 1 genus with them nauplius and were Chironomidae family respectively. The combined population of the lake zooplanktons Arasbaran most diverse branches of the genera Rotatoria Polyarthra, Synchaeta, Brachionus, Keratella, and Trichocerca the greatest diversity and abundance of this category is in the spring. In total, an average of 1,179 per liter Rotatoria 69 percent in the lake had the largest population. Between zooplankton abundance at different stations and months there was a statistically significant difference (P<0.05). In the summer season with another two seasons showed significant differences (P<0.05). Biological studies showed that plankton production potential Rotatoria branch in the lake at almost a high.