Length-Weight Relationship and Condition Factor of Seven Fish Species From Shahrbijar River,Southern Caspian Sea Basin,Iran

Length-weight relationship and condition factor were estimated in seven fish species,including barbus cyri,capoeta gracilis,alburnoides eichwaldii,pseudorasbora parva,ponticola cyrius,cobitis keyvani and acanthalburnus microlepis from shahrbijar river,guilan province,iran. a total of 416 specimens ranging from 18 to 135 mm in total length and from 0.06 to 19.25 g in total weight were collected. based on the results,growth coefficient values b ranged from 2.615 (in b. cyri) through 3.001 (in a. microlepis). all length-weight relationships were significant (p<0.05),with r2 higher than 0.819. the five species viz. c. gracilis,p. parva,c.keyvani,p. cyrius,and b. cyri showed allometric (b3b) while two species viz. a. microlepis and a. eichwaldii showed isometric (b=3) growth patterns. condition factor ranged from 0.57 (in c.keyvani) through 1.11 (in p.cyrius). all linear regressions were highly significant (p<0.05). the present study provides the first baseline information on the length-weight relationships of the seven fish species from shahrbijar river which may be useful for further fisheries management of these species.