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首页> 外文期刊>Aquaculture Research >Effect of dietary protein level on the reproductive performance of Niletilapia, Oreochromis niloticus (L.)
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Effect of dietary protein level on the reproductive performance of Niletilapia, Oreochromis niloticus (L.)

机译：日粮蛋白质水平对尼罗罗非鱼，尼罗罗非鱼（L.）生殖性能的影响

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摘要

The effects of Eve dietary protein levels (25%, 30%, 35%, 40% and 45%) on the individual spawning frequency and the egg production of 135 tagged female Nile tilapia, Oreochromis niloticus (L.), were studied from 8 May to 19 November 1996 in outdoor concrete tanks. Virtually identical spawning patterns were found in all treatments, but there was a great deal of variation in the frequency of spawning and egg production. Overall, individual spawning frequency varied from one to 14 and individual egg production from 31 to 2828 eggs per spawning. The average number of spawnings and average number of eggs per spawning for fish receiving dietary protein levels of 25%, 30%, 35%, 40% and 45% were 8.0 +/- 1.6, 8.4 +/- 2.2, 8.5 +/- 2.7, 8.4 +/- 2.5 and 9.4 +/- 2.1 spawnings, and 1167 +/- 305, 1082 +/- 410, 1288 +/- 324, 1145 +/- 389 and 1328 +/- 311 eggs per spawning, respectively, Fish receiving 45% dietary protein spawned more frequently than fish receiving 25% dietary protein. The total number of eggs produced per female was significantly higher for females fed 45% protein feed than females receiving 25% and 30% protein feeds. No definite trend was found in the number of eggs produced per spawning and the number of eggs produced per gram in females fed at different protein levels. Based on weekly checking, the time interval between spawnings varied from 7 to 77 days, and mean spawning intervals ranged from 15.8 to 17.1 days, Sixty per cent of females spawned after an interval 14 days, 15% after 21 days, 13.6% after 7 days, 7.2% after 28 days, 1.8% after 35 days and 1.0% after 42 days, and the time interval was 49-77 days for the rest of the females (1.5%), In all treatments, maximum spawning activity was recorded from May to August, and thereafter, it gradually decreased and no spawning females were found in November.
机译：从8中研究了夏娃饮食蛋白质水平（25％，30％，35％，40％和45％）对135个带标签的尼罗罗非鱼（Oreochromis niloticus（L.））的个体产卵频率和产蛋量的影响。 1996年5月至19日在室外混凝土罐中。在所有处理中都发现几乎相同的产卵模式，但是产卵频率和产卵率存在很大差异。总体而言，每次产卵的个体产卵频率从1到14不等，个体产卵量从31到2828不等。饮食蛋白质水平分别为25％，30％，35％，40％和45％的鱼的平均产卵数和每个产卵的平均卵数分别为8.0 +/- 1.6、8.4 +/- 2.2、8.5 +/-每次产卵分别为2.7、8.4 +/- 2.5和9.4 +/- 2.1产卵，每次产卵分别为1167 +/- 305、1082 +/- 410、1288 +/- 324、1145 +/- 389和1328 +/- 311个卵，接受45％饮食蛋白的鱼产卵的频率要高于接受25％饮食蛋白的鱼。饲喂蛋白含量为45％的雌性，每只雌性产卵的数量显着高于接受25％和30％蛋白饲料的雌性。在以不同蛋白质水平饲喂的雌性中，每产卵产生的卵数和每克产生的卵数没有明确的趋势。根据每周检查，产卵间隔时间为7到77天，平均产卵间隔为15.8到17.1天，间隔14天后产卵的雌性动物的百分比为60％，21天后为15％，7天后为13.6％。天，在28天后为7.2％，在35天后为1.8％，在42天后为1.0％，其余雌性动物的时间间隔为49-77天（1.5％）。在所有处理中，从5月至8月，此后逐渐减少，11月没有发现产卵雌性。

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