Study of Some Growth Parameters of Spirlin (Alburnoides Eichwaldii), in Tilabad Stream of the Golestan Province

In this study, the distribution, abundance and some growth parameters of Spirlin, Alburnoides eichwaldii in the Tilabad stream in the Golestan province was studied over 2009-2010. A total of 535 samples of Spirlins were collected by catching with Electroshocker. A total number of 205 samples was analyzed and the rest of the specimens were released. Spirlin was found only in stations 1 and 2 (the Headstream and next station) while station 2 had the highest number of summer Sprilin (0.889 # m-2). Catched fish were in three age-groups: 0, 1+, and 2+ years old with the longitudinal range of 25.34-110.16 mm. The exponential relationship between length and weight in both sexes indicated negative allometric growth. Growth equation was Lt= 12.45(1-e-0.248(t+0.39)) and Lt= 11.66(1- e-0.281(t+0.39)) for females and males of Spirlin, respectively. Apparently, Spirlinin in the Tialabad stream has no biotic suitability and faces severe environmental stress.