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首页> 外文期刊>Belgian Journal of Zoology >Evaluation of a man-made shelter's effects on survival and growth of Heterobranchus longifilis fry under cage culture
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Evaluation of a man-made shelter's effects on survival and growth of Heterobranchus longifilis fry under cage culture

机译：网箱养殖对人工庇护所对长鳍杂种鱼存活和生长的影响评估

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The effects of shelter made from inert synthetic shade materials on the survival and growth of Heterobranchus longifilis fingerlings were evaluated under cage (lm(3)) culture conditions in man-made Lake Ayame (Cote d'Ivoire) from September 2003 to March 2004 (180 days). In the first experiment, fishes (initial mean weight: 0.9 +/- 0.1 g; density: 100 fishes/m(3)) were reared during 90 days in either unsheltered or sheltered (white, blue or black synthetic shade material) cages. Survival and final mean weight were not affected by the colour of the shelter but were significantly higher (p<0.05) when shelter was provided (70.9-74.0% and 16.2-17. 1g for sheltered cages vs 64.0% and 11.8g for unsheltered). During the second experiment (90 days), H. longifilis (initial mean weight 0.9 +/- 0.1 g) were reared at four different stocking densities (100, 200, 500 and 1000 fishes/m3) in both sheltered and unsheltered cages. Survival and final mean weight noted were better in the sheltered cages. In both sheltered and unsheltered cages, these parameters were better for cages of 100 fishes/m3 and worst for cages of 1000 fishes/m3. In the third experiment (stocking density: 100 fishes/m(3)), H. longifilis of four different initial mean weight (13.2 +/- 1.3g, 25.2 +/- 2.5g, 40.3 +/- 4.0g and 60.3 +/- 6.0g) were reared during 60 days in either unsheltered or sheltered cages. Results showed two different effects of the shelter on survival and final mean weight of fishes: (1) positive effect for fishes weighting from 13.2 to 29.2g, and (2) negative effect for fishes weighting from 60.3 to 92.0g.
机译：在2003年9月至2004年3月的人造y菜湖（科特迪瓦）中，在笼养（lm（3））培养条件下，评估了由惰性合成遮荫材料制成的遮蔽物对长杂种鱼的存活和生长的影响（ 180天）。在第一个实验中，将鱼（初始平均重量：0.9 +/- 0.1 g;密度：100条鱼/ m（3））在无遮蔽或遮蔽（白色，蓝色或黑色合成阴影材料）网箱中饲养90天。存活率和最终平均体重不受庇护所颜色的影响，但提供庇护所时显着更高（p <0.05）（庇护笼的重量为70.9-74.0％和16.2-17。1g，非庇护笼的重量为64.0％和11.8g） 。在第二个实验期间（90天），在有遮蔽网箱和无遮蔽网箱中以四种不同的放养密度（100、200、500和1000条鱼/立方米）饲养了长柄嗜血杆菌（初始平均重量为0.9 +/- 0.1克）。在庇护笼中记录的存活率和最终平均体重更好。在有棚和无棚网箱中，这些参数对每立方米100条鱼的网箱比较好，而对于每千立方米1000条鱼的网箱，这些参数最差。在第三个实验中（放养密度：100条鱼/米（3）），长柄假单胞菌具有四种不同的初始平均重量（13.2 +/- 1.3g，25.2 +/- 2.5g，40.3 +/- 4.0g和60.3 + /-6.0g）在无棚或有遮盖的笼子中饲养60天。结果表明，避难所对鱼类的存活率和最终平均重量有两种不同的影响：（1）重量为13.2至29.2g的鱼类有正面影响，（2）重量为60.3至92.0g的鱼类有负面影响。

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