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首页> 外文期刊>Bangladesh journal of fisheries research >Effect of salinity and food ration level on the growth of Nile tilapia (Oreochromis Niloticus L.)
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Effect of salinity and food ration level on the growth of Nile tilapia (Oreochromis Niloticus L.)

机译：盐度和食物配比水平对尼罗罗非鱼生长的影响

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摘要

The effect of salinity (0, 10 & 20‰, water temperature 28 ± 1°C) and food ration (3 and 4.5% bw/day) on food consumption and growth of Nile tilapia, Oreochromis niloticus (10.77 ± 0.21g) were investigated. Individual food consumption was measuredusing X-radiography technique. Salinities (0, 10 & 20‰) did not have significant effect on the growth rate of groups of Nile tilapia fed at different ration levels (3 & 4.5% bw/day). This study showed that the growth of all-male fish was significantly better than all-female fish for all three salinities and two rations. Salinities from 0 to 20‰ had no effect on growth performance of males or female fish. In the present study, it was evident that fish fed at 3% bw/day ration ate all the food offered and fish fed at 4.5% bw/day did not consumed all amounts. Also, growth performance did not significantly differ among fish fed at 3% bw/day ration level and reared at different salinities. Fish reared under higher salinities (20‰) and fed at higher ration(4.5% bw/day) level had skin lesions and injuries on their body. It was assumed that fish fed at higher ration under higher salinities (20‰) and maintained higher osmoregulatory costs together with osmotic stress may have a negative influence on the appetite offish. Another possibility that may have affected the appetite could be the unionized ammonia levels that were high. The high-unionized ammonia levels combined with the osmotic stress may have been the cause, or have aided, development of skin lesions and injuries on the fish at higher salinities.
机译：盐度（0、10和20‰，水温28±1°C）和食物定量（3和4.5％bw /天）对尼罗罗非鱼，尼罗罗非鱼（10.77±0.21g）的食物消耗和生长的影响分别为调查。使用X射线照相技术测量个人食品消费量。盐度（0、10和20‰）对饲喂不同日粮水平（3和4.5％bw /天）的尼罗罗非鱼组的生长速度没有显着影响。这项研究表明，在所有三种盐度和两种配比下，全雄鱼的生长明显优于全雌鱼。盐度从0到20‰对公鱼或雌鱼的生长性能没有影响。在本研究中，很明显，以3％bw /天的定量饲喂的鱼吃掉了所有提供的食物，而以4.5％bw /天的定量饲喂的鱼并未消耗所有的食物。同样，以3％bw /天的日粮水平饲喂并以不同盐度饲养的鱼的生长性能也没有显着差异。在较高盐度（20‰）下饲养的鱼和以较高定量（4.5％bw /天）喂养的鱼的皮肤有损伤，并且身体受到伤害。据推测，在较高盐度（20‰）下以较高的定量饲喂的鱼，维持较高的渗透调节成本以及渗透压，可能会对鱼的食欲产生负面影响。可能影响食欲的另一种可能是氨化的氨含量很高。高去离子氨水平与渗透压结合可能是导致较高盐度的鱼类皮肤损伤和伤害的原因，或对此有帮助。

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