No abstract

No abstract

Two intramu applied with a) was given HCG per fis spawning at injection) fro Ovarian bio order to mo not expecte Diameters o diameter of the egg diam the egg diam spawned. Th having a dia and transpa were 800±30 more succe breeding pr were succes fertilization gastrula sta spawn. Two acids profil recorded in strategy this strategy inje polyunsatur arachidonic acids. Our r scheduled i injected gon

No abstract

Induced spawning is used to solve failure of complete oocyte maturation and fish spawning in captivity. Hormonal inductions with luteinizing hormone releasing hormone analogue (LHRH a ) were examined to induce synchronized ovulation and improve spawning of wild-caught rabbitfish, Siganus rivulatus. Three experiments were carried out to study their impact on egg quality. Experiment I: LHRH a intramuscular injections of 50 and 100 µg kg -1 were used for two different groups respectively with a third control group. Experiment II: LHRH a injection (100 µg kg -1 ) was used to study the impact of both spontaneous spawning and stripping methods. Experiment III: LHRH a injection (50 µg kg -1 ) was used to study the influence on sex ratios. Two successive injections (LHRH a ) were used for females in all experiments while male fish received only one dose. In experiment I, the response to higher dose showed a significant increase (p < 0.01) in egg diameters, latency time, total number of spawning fertilized eggs and hatching rate. In experiment II & III, a significant improvement (p < 0.01) was observed in all egg quality parameters with both spontaneous spawning and sex ratio (2 male:1 female). LHRHa injection is an adjunct to improve spawning performance and Siganus rivulatus culture production.