Pre-spawning hormonal stimulation of carp in the conditions of the Al-Suwaira central fish hatchery

The experience of pre-spawning hormonal stimulation of carp at the Al-Suwaira central fish hatchery in the Wasit governorate of the Republic of Iraq is being considered. A comparative analysis of the effectiveness of the use of dried pituitary extract and the synthetic drug “Nerestin” in artificial reproduction of carp is described. The effect of a biologically active factor on reproductive processes in both male and female carp was studied under controlled artificial conditions. The results showed that the pre-spawning drug based on dried pituitary hormone and Spawning when used separately led to successful carp spawning, with slight differences in fertilization and hatching rates. During experimental pre-spawning hormonal stimulation of common carp (Cyprinus carpio) under artificial reproduction conditions at the Al-Suwaira central fish hatchery, after administration of the hormone preparation “Nerestin” to spawning females, the proportion of mature eggs in individuals reached an average of 98%. However, the combined use of pituitary extract and Nerestin resulted in greater variability of results, accompanied by a decrease in effectiveness. The indicators of the percentage of fertilization and the yield of pre-larvae for the group in which the combined effect of the drugs was used also differed by lower average values with a wider confidence interval for the measured value. Diluted pineapple juice was used to de-glue the eggs, keeping them in this solution for 20 minutes, with the addition of diluted green tea extract to strengthen the caviar shell. The drug “Nerestin”, being a synthetic and economically advantageous drug due to its lower price, may become a promising alternative to currently common pituitary extract-based drugs for stimulating carp spawning in aquaculture in Iraq.