Sk. Srivastav et Ak. Srivastav, ANNUAL CHANGES IN SERUM-CALCIUM AND INORGANIC-PHOSPHATE LEVELS AND CORRELATION WITH GONADAL STATUS OF A FRESH-WATER MURREL, CHANNA-PUNCTATUS (BLOCH), Brazilian journal of medical and biological research, 31(8), 1998, pp. 1069-1073
Adult Channa punctatus murrels of both sexes (60-80 g) were collected
locally from Ramgarh Lake during the second week or every month (10 in
dividuals of each sex/month) throughout the year. Blood samples were c
ollected and analyzed for serum calcium and phosphate levels by the me
thods of Trinder (1960) and Fiske and Subbarow (1925), respectively. G
onads were fixed to judge the state of maturation of the fish. Males e
xhibited no change in serum calcium levels throughout the year in corr
elation with testicular maturation, However, serum phosphate levels ex
hibited a rise in correlation with the increased gonadosomatic index.
Females showed marked seasonal changes in serum calcium and phosphate
levels which were associated with ovarian maturation (vitellogenesis).