Researches on Evaluating the Efficiency of Hormonal Stimulation with Silver Carp Pituitary Extract in Order to Optimize Controlled Reproductive Technology at Asian Cyprinids

Abstract

Large requirements of fish larvae, led the specialists at the Carja 1 farm to experience injection with pituitary extract from other species of cyprinids, silver carp pituitary. The experiment took place in the period from 2-25 June 2008.

To verify the effectiveness of injections of silver  carp pituitary suspension were used two experimental groups of 30 exemplars (1:1), the first group of females received a total dose of 2.9 mg/kg, and the second batch a dose of 4.5 mg/kg. The total dose used for breeding male is 2 mg/kg pituitary. During the Asian cyprinid reproductive guided aimed to determine: the proportion of breeding maturation, fertilization rates and survival during embryonic development index and the index of survival to hatch from eggs to larvae of 3-5 days (most representative for the whole process of reproduction). Determining the number of larvae from each batch of fertilized eggs, the ultimate goal of action is guided by reproductive hormonal stimulation with silver carp pituitary. The number of larvae obtained from experimental plots 3-5 days silver carp injected with silver carp pituitary extract (63,96 and 64,67 thousand) comparable with those obtained in experimental groups grass carp (36,21 and 31,14 thousand) and bighead carp (39,36 and 41, 34 thousand) was approximately 58% higher.