Growth patterns of Paracobitis iranica in Qarah-Chai River- Qom Province

Paracobitis iranica is an endemic loach of Iran and little is known about its biology.This study was carried out to evaluated growth pattern of this species with 182 fishsamples that obtained from February up to July 2013 with beach line net. Sex ratioof male to female was 1: 1.68 that showed significant difference between sex rationof male to female in population (X2 = 111.45, P<0.05). Maximum total length andweight were 63 mm and 2.77 g for females, 66 mm 2.21 g for males, respectively.The weight-length relation of female was W = 0.009 TL 2.91 (r2 = 0.89) and the weightlengthrelation of male was W = 0.007 TL 3.07 (r2 = 0.96) and the total relation was W= 0.009 TL 2.96 (r2 = 0.91). The results showed positive allometric growth (t-test, tRmaleR=1.86, tfemale = 2.20, tRpopulation= 2.31, P> 0.05). The condition factor was estimated 0.74± 0.08 in male and 0.99 ± 0.16 in female and the total condition factor was 0.91 ±0.13.

کلیدواژه ها:

Length- Weight relation ، Paracobitis iranica ، Qarah-Chai River ، Qom