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, alburnoideseichwaldii in the tilabad stream in the golestan province was studied over 2009-2010. a totalof 535 samples of spirlins were collected by catching with electroshocker. a total number of205 samples was analyzed and the rest of the specimens were released. spirlin was found onlyin stations 1 and 2 (the headstream and next station) while station 2 had the highest numberof summer sprilin (0.889 # m-2). catched fish were in three age-groups: 0, 1+, and 2+ yearsold with the longitudinal range of 25.34-110.16 mm. the exponential relationship betweenlength and weight in both sexes indicated negative allometric growth. growth equation waslt= 12.45(1-e-0.248(t+0.39)) and lt= 11.66(1- e-0.281(t+0.39)) for females and males ofspirlin, respectively. apparently, spirlinin in the tialabad stream has no biotic suitability andfaces severe environmental stress.