Effect of the Type of Pituitary Extracts and Dose of Synthetic Hormones HCG and Ovaprim on Some Reproductive Characteristics of the Endogenous Catfish of Cameroon Clarias jaensis (Boulenger, 1909) in a Controlled Environment

P. Zango, C. Tiogué, Paulin Nyadjeu, A. Kenfack, Sidoine Gaelle Ngounou Tseuwo, Stephane Michel Kamanke Kamanke, Arnaud Bolivard Tiendeu Kameni, M. Tomedi, J. Tchoumboué
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Abstract

Aims: Improve the domestication of Clarias jaensis through fry production in a controlled environment. Place and Duration of the Study: From April to August 2020 in Integrated Aquaculture Common Initiative Group of West in Batie (LN: 5°17'0''-5°18'53'' and LE: 10°17'0''-10°19'31''), Sudano-Guinean altitude zone of West Cameroon. Study Design: 42 females and 15 males of respective weight and size: 177±40.46g, 347.62±111.72g, 29.02±1.74cm and 39.52±12.27cm were used and divided into 7 batches of comparable weights and sizes.  Two randomly selected batches were subjected to the female pituitary extract of Clarias jaensis and Toads, five others to the synthetic hormones HCG (doses 3800 and 4000 IU/kg live weight) and Ovaprim (doses of 0.4, 0.5 and 0.6 ml/kg) respectively. Methodology: Eggs were enumerated by direct observation after fertilization. At the end of the hatching (D1) and of vitelline resorption (D3), the larvae of each experimental lot were counted and measured. Results: The mean diameter of the oocytes after induction, the relative and absolute fecundities and the fertility rate were higher in batches treated with the hormone HCG at a dose of 4000 IU/kg (2.12±0.1mm;  29,584±5,19 oocytes/g;  4694±620 oocytes and 80.14±9.78%), the lowest values were obtained with HCG at 3800 IU /kg, Ovaprim at 0.4ml/kg, pituitary toad extract and Ovaprim at 0.5 ml/kg (1.93±0.06mm; 15.29 ± 4.22 oocytes/g; 1410±106 oocytes and 55.34±1.51%). The hatchability rate was higher with Ovaprim at 0.6ml/kg, followed by HCG at 4000 IU/kg, However, no significant differences were observed between treatments (P>0.05)." Conclusion:  In a fish farm of intensive production, the use of the hormone Ovaprim dose 0.6 ml/kg or HCG at 4000IU/kg will lead to high results.
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垂体提取物的类型以及合成激素 HCG 和 Ovaprim 的剂量对喀麦隆内源鲶鱼 Clarias jaensis (Boulenger, 1909) 在受控环境中的一些生殖特征的影响
目的:通过在受控环境下生产鱼苗,改进褐鲤的驯化。 研究地点和时间:2020年4月至8月,在喀麦隆西部苏丹-几内亚海拔区的巴蒂(LN:5°17'0''-5°18'53'',LE:10°17'0''-10°19'31'')西部综合水产养殖共同行动组进行。 研究设计:选取体重和体型分别为 177±40.46g、347.62±111.72g、29.02±1.74cm 和 39.52±12.27cm 的雌性 42 只和雄性 15 只,将其分为 7 批,每批的体重和体型相当。 随机抽取两批,分别用蟾蜍和胭脂鱼的雌性垂体提取物,另外五批分别用合成激素 HCG(剂量为 3800 和 4000 IU/kg活重)和 Ovaprim(剂量为 0.4、0.5 和 0.6 ml/kg)。 方法:受精后直接观察卵子数量。在孵化末期(D1)和卵黄吸收末期(D3),对每个试验批次的幼虫进行计数和测量。 结果用剂量为 4000 IU/kg 的 HCG 处理的批次,诱导后卵母细胞的平均直径、相对受精率和绝对受精率均较高(2.12±0.1mm;29584±5.19 卵母细胞/g;4694±620 卵母细胞和 80.在 4000 IU/kg(2.12±0.1mm;29584±5.19 个卵母细胞/g;4694±620 个卵母细胞和 80.14±9.78%)的条件下,HCG 为 3800 IU/kg、Ovaprim 为 0.4ml/kg、垂体蟾蜍提取物和 Ovaprim 为 0.5ml/kg(1.93±0.06mm;15.29±4.22 个卵母细胞/g;1410±106 个卵母细胞和 55.34±1.51%)的条件下,孵化率最低。孵化率以 0.6 毫升/千克的 Ovaprim 较高,其次是 4000 IU/千克的 HCG,但各处理之间无显著差异(P>0.05)"。 结论 在集约化生产的养鱼场中,使用剂量为 0.6 毫升/千克的卵磷脂或剂量为 4000IU/ 千克的 HCG 会带来很好的效果。
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