Assessment of correlation between biochemical factors of blood with some biological characteristic of gonad in Acipenser ruthenus and Acipenser baeri

Abstract

Blood indexes are very important in fish physiology, the more knowledge of blood indexes of fishes, the more ability of breeding and culturing of them. In the present study, The correlation between biochemical factors of blood (calcium, magnesium, total protein,
cholesterol and glucose) with weight of female fishes and some biological characteristics of gonad (e.g. fertilization rate, fluid egg rate, gonadosomatic index , polarization index and oocyte diameter) in 9 female of the migratory population of Sterlet (Acipenser ruthenus) and 3 female of the migratory population of Siberian sturgeon (Acipenser baeri) in Spring of the 2012 were determined. In Sterlet, significant negative correlations were observed between blood Ca+2 with oocye diameter and fertilization rate (P<0.05). Also there was significant negative correlations between blood Ca+2 with fluid egg rate and gonadosomatic index (P<0.01). There was an invert correlation between total protein with oocyte diameter and fluid egg rate (P<0.05). Relationship between blood cholesterol with oocyte diameter, fluid egg rate, and fertilization rate and gonadosomatic index was direct, but this correlation was not significant. In Siberian sturgeon, there was an invert correlation between blood glucose and body weight (P<0.05). Also there was significant positive correlation between total protein and gonadosomatic index (P<0.05). Blood calcium was positively correlated with body weight, polarization index, fluid egg rate and fertilization rate but these correlations were not significant. Relationship between total protein and blood cholesterol with body weight, fluid egg rate, fertilization rate was negative that was not significant.