Evaluation of the effectiveness and cost of different hormones in stimulating the spawning of thin lipped grey mullet, Liza ramada

Abstract

ABSTRACTIntroduction: It is known that mullets are not fully mature in captivity and therefore do not lay eggs. Therefore, hormonalpreparations should be used to stimulate spawning.Aim of the work: To evaluate the effectiveness and cost of using different types of hormones; pituitary hormone of carp,human chorionic gonadotropin, gonadotropin - releasing hormones in stimulating spawning of Liza ramada.Materials and Methods: In this study, the pituitary gland was selected for two types of carp; common carp, silver carp, andhuman chorionic gonadotropin, as well as buserelin acetate and triptorelin acetate to stimulate the spawning of Liza ramada.In this regard, these hormones were tested on the rate of ovulation, fertilization rate, embryonic development and hatchingrate, as well as an economic evaluation of the cost of injecting these hormones.Results: The results showed the effectiveness of the used hormones to stimulate ovulation, fertilization and hatching, but atdifferent rates. The use of the pituitary gland of silver carp induced a higher ovulation rate than those of common carp andhuman chorionic gonadotropin. Buserelin acetate induced higher ovulation, fertilization and hatching rates than those oftriptorelin acetate. From the economic point of view, the use of the pituitary gland of silver carp as a stimulant dose and alsothe use of buserelin acetate as a resolving dose is less expensive compared to the use of other tested hormones.Conclusion: The use of the pituitary gland of silver carp and buserelin acetate was effective to stimulate the spawning ofmullets and less expensive.