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首页> 外文期刊>Bangladesh journal of fisheries research >Effects of socking density on ammonia excretion and the growth of Nile tilapia (Oreochromis Niloticus L.)
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Effects of socking density on ammonia excretion and the growth of Nile tilapia (Oreochromis Niloticus L.)

机译：袜子密度对尼罗罗非鱼氨排泄和尼罗罗非鱼生长的影响

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摘要

The effects of stocking density (10,15, 50 & 75 fish in 65Ltank) and ammonia excretion on the growth of Nile tilapia, Oreochromis niloticus (12.19 ± 1.21 g) were investigated. Increasing stocking density of Nile tilapia from 15 fish/tank (2.81 g fish/L) to 75 fish/tank (14.07 g fish/L) resulted in associated increase in ammonia level (1.48 ± 0.87 mg/L to 26.44 ±11.4 mg/L) and significantly lower growth rates. Significantly better feed conversion ratios were found for fish reared at lower (15 fish/tank) stocking densities compared to higher (75 fish/tank) stocking densities. Individual growth rates were significantly better for fish reared at a lower stocking density 15 fish/tank compared to higher stocking density 75 fish/tank and size variation(coefficient of variation in weight) were positively correlated with stocking density. Although water exchange did not have a significant effect on the growth of Nile tilapia for fish stocked at 10 fish/tank (1.88 g fish/L) and 50 fish/tank (9.38 g fish/L), however, the fish in the higher stocking density (9.38 g fish/L) groups and without water exchange, significantly changed the coloration of their bodies (silver to black) which may be due to the lower oxygen levels combined with higher ammonia levels. Ammonia level increased with increasing stocking density and without water exchange. In this study, it may be suggested that when fish reared at higher stocking densities then water exchange must be taken in to consideration so as to help avoid environmental and physiological stress to the fish.
机译：研究了65Ltank中的放养密度（10、15、50和75条鱼）和氨排泄对尼罗罗非鱼，尼罗罗非鱼（12.19±1.21 g）的生长的影响。尼罗罗非鱼的放养密度从15条鱼/罐（2.81 g鱼/升）增加到75条鱼/罐（14.07 g鱼/升）导致氨水平相关增加（1.48±0.87 mg / L到26.44±11.4 mg / L） L）并显着降低增长率。与较低的（75种鱼/坦克）放养密度相比，以较低的（15种鱼/坦克）放养密度养殖的鱼饲料转化率明显更高。与较高的放养密度75的鱼/坦克相比，在较低放养密度15的鱼/桶中养殖的鱼的个体生长速度明显更好，并且尺寸变化（重量变化系数）与放养密度呈正相关。尽管水交换对10尾/箱（1.88克鱼/升）和50尾/箱（9.38克鱼/升）的鱼类的尼罗罗非鱼的生长没有显着影响，但是，高放养密度（9.38 g鱼/升）组且未进行水交换，显着改变了其身体的颜色（从银色变为黑色），这可能是由于较低的氧气含量和较高的氨含量造成的。氨含量随着放养密度的增加而增加，并且没有水交换。在这项研究中，可能建议当以较高的放养密度养鱼时，必须考虑水交换，以帮助避免对鱼的环境和生理压力。

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