DIFFERENT FECUNDITY RELATIONSHIPS AND GONADOSOMATIC INDEX OF Clarias gariepinus INFECTED WITH OVARIAN PARASITE Myxobolus gariepinus
Gehad A. Ismail1 and M.S. Mohamed2
1Fish Diseases and Management research Department, Animal Health Research Insti-tute, Agriculture Research Center, Egypt.
2 Feeding Department- Central Laboratory for Aquatic Research, Agriculture Research Center, Egypt.
Received 7 /2 /2021
Accepted 10 /3 /2021
This study was conducted to screening for Myxobolus species infection in catfish (Clarias gariepinus). In addition to, study the effects of ovarian infection by M. gareipinus on gonadosomatic index, fecundity and different biometric parameters (ovary weight, egg weight and egg diameter) of catfish (C. gariepinus)About 100 fish with average body weight (653.34±3.21g) were originating alive from fish farm from Sharkia Governorate. Giemsa-stained smears of ovarian parasite indicated that, the spores were of Myxobolus gariepinus, with prevalence (23.33 %) of examined female fish. Gonadosomatic index (GSI), absolute fecundity and all biometric parameters of M. gareipinus infected fish were significantly (P<0.5) lower than those of uninfected fish. In addition to, a linear correlation between fecundity and all biometric parameters of infected females fish was non-significantly positive correlation (r>0.05). While, the linear correlations between fecundity and all biometric parameters of uninfected females fish was significantly positive correlation (r<0.05). We can concluded that, Myxobolus gareipinus ovarian infection decreased gonadosomatic index, fecundity and all biometric parameters of catfish (Clarias gariepinus). In addition to, M.
gariepinus lower the rate of increases of the linear relationships between fecundity and all biometric parameters as compared with high rate of increases of uninfected fish. Further confirm investigations including ultrastructure and immunological studies must take place.
Keywords: Myxobolus gareipinus, Clarias gariepinus, Gonadosomatic Index, Fecundity, Egg weight, Egg diameter.