عنوان مقاله [English]
Caspian sand goby, Neogobious fluviatilis pallasi belongs to Gobididae family that has important role in food cycle of Caspian Sea because of their high population. This study was carried on population of Caspian sand goby on the southern west coastal of Caspian Sea from October 2005 to September 2006 for 1 year. Samples were collected from 4 stations (Astara, Anzali, Chamkhaleh and Chaboksar coasts) from 0 to 15 meters of depth, monthly, by bottom trawl. Analysis of differential functions of morphological characteristicsshowed 51.3%, 28.4% and 20.3%, respectively. Percentage comulative of DF1 and DF2 was 80% which is indicative of inter group changes. Detective figures of two functions showed that studied samples in Astara station was completely different from other regions and was similar to Anzali station. The stations of Chamkhaleh and Anzali were the same. Chaboksar station was a separated group, too. Analysis of differential functions for traits in mind include an average of 86.3% of population, most of which belongs to Astara station with 93.3% and then Anzali with 90% and The lowest number belonged to Chamkhaleh with 79.3%. The results showed that Neogobious fluviatilis pallasi has three different populations on the coasts of Guilan province which include Astara, Anzali-Chamkhaleh and Chaboksar populations.