اثر بخشي اطلاعات هواشناسي از ديدگاه كشاورزان استان گلستان

The effect of maturity stages on chemical compositions of muscles of Rutilus frisii kutum Kamenskii, 1901 in Gorgan bay

Chemical compositins (lipid and protein) of Rutilus frisii kutum muscles were studied in different maturity stages from Jan to Aprill 2006 in 40 spaciements of Gorgan bay Rutilus frisii kutum. The average length and weight of males and females were 411.8±66 mm, 1014±33.88 gr and 425.5±86mm, I042±41.7 gr respectively. Based on histological studies of captured fishes, 4 maturity stages were distinguished (males: II, II-III, III-IV and IV; Females: II-III, III, III-IV and IV). Result showed that both Lipid and protein contents of muscles in different maturity stages of both males and females were decreased from 12.3±0.2^ dry weight of muscle and 88.4±0.7X dry weight of muscle to 87.9±1.7X dry weight of muscle during II-III to IV-V in females and from I3.1±0.8^ dry weight of muscle to 11.9±0.9^ dry weight of muscle and 89.5±1.45X dry weight of muscle to 87.3±1.15^ dry weight of muscle during II to IV-V in males respectively. But no significant differences observed among different maturity stages (P>0.05).