Assessment of the Effects of Some Reproductive Hormones on Aspects of Reproductive Biology of Clarias gariepinus and Heterobranchus longifilis

P. P. Uyon, I. Akpan, R. Moruf, N. Abiaobo, I. E. Asuquo, E. Udoinyang, M. Essien-Ibok, I. E. Udosen, I. George
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Abstract

Protein food sources are highly recommended for a healthy living and fish is one of the most recommended protein sources. This research was aimed at enhancing fish seed propagation and the effects of four fish reproductive hormones (Ovaprim, Carp pituitary extract, human chorionic gonadotropin, and Deoxy-corticosterone acetate) on some aspects of reproductive biology of Heterobranchus longifilis and Clarias gariepinus bought from Itu head-bridge, Akwa Ibom state. Sixty mature broodstocks (both males and females) of each species weighing 2.0 kg were used in this study. The experimental procedure was made up of four experimental groups (treatments) with three replicates including control. Each group was administered with the appropriate dosage of the respective reproductive hormone. The mean relative fecundity in both species using ovaprim and human chorionic gonadotropin showed no significant difference, while carp pituitary extract showed significant difference (p < 0.05) in both species. The mean egg hatchability values in the species administered with ovaprim, human chorionic gonadotropin and carp pituitary extract were similar (p > 0.05). Mean values were significantly different (p < 0.05) from those administered with Deoxy-corticosterone acetate. The mean fry survival rates in both species were not significantly different (p > 0.05) with human chorionic gonadotropin, carp pituitary extract and ovaprim, but showed significant difference (p < 0.05), except Deoxy-corticosterone acetate. Female brooders in the control tanks showed no result throughout the study. Treatments with the hormones yielded better result, except in the case of Deoxy-corticosterone acetate. It could be concluded that reproductive hormones, especially ovaprim and carp pituitary are better for breeding H. longifilis and C. gariepinus. The results from the study are crucial in encouraging fish seed propagation through the application of artificial hormones.
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几种生殖激素对加里宾克拉尾鱼和长尾异鳃鱼生殖生物学影响的评价
为了健康的生活,蛋白质食物被强烈推荐,鱼类是最受推荐的蛋白质来源之一。本研究旨在研究四种鱼类生殖激素(Ovaprim、鲤鱼垂体提取物、人绒毛膜促性腺激素和醋酸去氧皮质酮)对长尾异鳃鱼(Heterobranchus longfilis)和加里平Clarias gariepinus)生殖生物学方面的影响。本研究选用各鱼种60条成熟亲鱼(雌雄均有),体重2.0 kg。试验过程分为4个试验组(处理),每组设3个重复,包括对照组。各组分别给予相应剂量的生殖激素。ovaprim和人绒毛膜促性腺激素对两种鱼的平均相对繁殖力影响不显著,而鲤鱼垂体提取物对两种鱼的平均相对繁殖力影响显著(p < 0.05)。ovaprim、人绒毛膜促性腺激素和鲤鱼垂体提取物的平均卵孵化率相近(p > 0.05)。平均值与使用醋酸脱氧皮质酮组有显著差异(p < 0.05)。除乙酸脱氧皮质酮外,人绒毛膜促性腺激素、鲤鱼垂体提取物和ovaprim对两种鱼苗的平均成活率差异不显著(p > 0.05),但差异显著(p < 0.05)。在整个研究过程中,对照组中的雌性育雏鱼没有任何结果。除醋酸脱氧皮质酮外,激素治疗效果较好。由此可见,生殖激素,尤其是ovaprim和鲤鱼垂体素对长尾鲤和加里滨鲤的繁殖效果较好。这项研究的结果对于通过应用人工激素促进鱼类种子繁殖至关重要。
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