مقايسه طولي و وزني شاه ميگوي آب شيرين در دو زيستگاه درياي خزر و درياچه سد ارس

Length-Weigth comparison of freshwater crayfish from the Caspian sea and Aras dam habitats.

Weight and length are of the most important factors affecting on the stock assessment and population dynamic studies which have been studied on Iranian freshwater crayfish (Astacus leptodactylus) in different habitats. The mean total length and weight of samples caught from the Caspian sea were smaller than the samples from the Aras dam. Also the length of the greatest samples from sea (156mm TL, 106.92g W) was smaller than the similar factors from Aras dam (186mm TL, 239.6g W). Sex ratio from catches was dominated by males in both habitats but differed greatly from the sea (M: F = 4.33: 1.00) to Aras dam (M: F = 1,33: 1.00). 65.2% of total catch from Caspian sea was longer than 102mm while 83.2% of total catch from the Aras dam was longer than 100mm.