Effects on the reproduction of C. gariepinus after ovulation stimulation with carp pituitary homogenate (CPH), Ovopel or Dagin were investigated. After the application of Ovopel all the females spawned while after CPH or Dagin treatment spawning was reduced to 83.3%. No statistically significant effect of the stimulator was found on the weight of eggs expressed in g and in % of female B.W. however, the highest mean values of these parameters were found after Dagin. A statistically significant effect of the stimulator was noted for the percentage of fertilization and living embryos after 24h and 28h incubation. The highest percentage of live embryos after a 28h incubation of eggs was found after the treatment with Dagin and the lowest after Ovopel; the difference between the means of these stimulators was statistically significant. The females ovulated 12h after Ovopel treatment yielded eggs of a higher weight and of significantly higher quality compared with those obtained 3h later. The relative effectiveness of reproduction, expressed as the number of live embryos per kg of female B.W., was highest after Dagin treatment.
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