The African catfish (Clarias gariepinus) is an important aquaculture species in the Philippines, but it exhibits reproductive dysfunctions in captivity due to the absence of natural spawning cues and culture-induced stress. In hatcheries, sperm collection often requires sacrificing male breeders, limiting breeding program applications, and threatening genetic diversity. This study evaluated and optimized hormonal induction protocols to enhance spermiation and fertilization success in male C. gariepinus. Two experimental trials were conducted under controlled hatchery conditions. In Trial 1, human chorionic gonadotropin combined with a dopamine antagonist (hCG + DA; 5000 IU·kg−1 BW + 5 mg·kg−1 BW) and Ovaprim (1.0 mL·kg−1 BW) significantly increased circulating testosterone and estradiol levels, spermiation index, and fertilization outcomes (embryo viability, hatching, and larval survival). In Trial 2, medium to low doses of hCG + DA (3000–5000 IU·kg−1 BW + 5 mg·kg−1 BW) and Ovaprim (0.75–1.0 mL·kg−1 BW) yielded the best performance in terms of hormone levels, spermiation index, and fertilizing capabilities. The presence of a dopamine antagonist (DA) likely contributed to the efficacy of the treatments, since dopamine suppresses the secretion of gonadotropin-releasing hormone (dopaminergic inhibition), and DA counteracts this effect, increasing LH and FSH levels necessary for gametogenesis. Taken together, these results highlight the potential of optimized hormonal protocols to mitigate reproductive dysfunctions in male C. gariepinus in aquaculture settings. Further studies should refine dose combinations, assess the long-term health of broodstock, and evaluate cost-effectiveness to support sustainable broodstock management and genetic conservation.
Superio et al. (Wed,) studied this question.
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