Effects of broodstock sex pairing ratios and rest periods of the nile tilapia Oreochromis niloticus on fry production

S. Addo, E. N. A. Oblie, C. P. Duodu, S. K. K. Amponsah, W. Sowah, E. Asamoah
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Abstract

 This study evaluated the effects of varying male to female brood stock pairing ratios of 1:1, 1:2 and 1:3 with resting intervals of 0, 3 and 7 days on fry production of the Nile tilapia at the Aquaculture Demonstration Centre (ADC), Ashaiman, Ghana. Nine (9) treatments were arranged according to a 3 x 3 factorial design with three replicates giving a total of 27 spawning hapas (1 m3). Male and female brooders of mean body weight (229 ± 5.43 g and 171.6 ± 21.7 g respectively) were paired at the different sex ratios. Water temperature and DO were taken daily whiles pH, salinity and ammonia were measured weekly. All the water quality parameters were within suitable range for Nile tilapia fry production. The total mean fry output for the sex pairing ratios (1:1, 1:2, 1:3) were 716 ± 344, 973 ± 325 and 723 ± 577 respectively. The total fry output for 0, 3 and 7 days of resting were 1503 ± 868, 2030 ± 637 and 3051 ± 1054 respectively with an observed 35% (3 days rest) and 103% (7 days rest) fry production increment over the 0-resting treatment. With respect to the combined effect of varying sex ratios and resting periods, the highest mean fry production (701 ± 405) was attained under the 7 days resting period at a pairing ratio of 1:2. The high reproductive performance of broodstock pairing ratio 1:2 and resting period of 7 days under this study confirms its efficient as a broodstock management technique for an increased Nile tilapia fry production.  
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尼罗罗非鱼育苗性别配对比例和休渔期对鱼苗产量的影响
本研究评估了加纳阿塞曼水产养殖示范中心(ADC)不同雌雄配对比例(1:1、1:2 和 1:3)和 0、3 和 7 天休眠间隔对尼罗罗非鱼鱼苗产量的影响。九(9)种处理按照 3 x 3 的因子设计进行排列,三个重复共计 27 个产卵池(1 立方米)。雌雄育雏鱼的平均体重(分别为 229 ± 5.43 克和 171.6 ± 21.7 克)按不同性别比例配对。每天测量水温和溶解氧,每周测量 pH 值、盐度和氨氮。所有水质参数都在适合尼罗罗非鱼鱼苗生产的范围内。性别配对比例(1:1、1:2、1:3)的平均鱼苗总产量分别为 716 ± 344 尾、973 ± 325 尾和 723 ± 577 尾。休眠0天、3天和7天的鱼苗总产量分别为1503±868尾、2030±637尾和3051±1054尾,与休眠0天相比,鱼苗产量分别增加了35%(休眠3天)和103%(休眠7天)。在不同性别比例和休眠期的综合影响方面,在配对比例为 1:2 的情况下,休眠 7 天的平均鱼苗产量最高(701 ± 405)。在本研究中,1:2 的配对比例和 7 天的休养期所产生的高繁殖性能证实了其作为提高尼罗罗非鱼鱼苗产量的育苗管理技术的高效性。
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