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首页> 外文期刊>Aquaculture International >Effects of stocking density on survival and growth of juvenile tench (Tinca tinca L.)
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Effects of stocking density on survival and growth of juvenile tench (Tinca tinca L.)

机译：放养密度对少年鲈（Tinca tinca L.）生存和生长的影响

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In two 120-day experiments, performed in the laboratory at 22°C, the effects of stocking density on the survival and growth of juvenile tench (Tinca tinca L.) were evaluated. Fish were kept in fibreglass tanks, supplied throughout with flow of artesian water, and fed a dry diet for salmonids, in excess, supplemented with restricted amounts of Artemia nauplii. In the first experiment four-month-old juveniles (0.31 ± 0.04 g and 32.00 ± 1.17 mm TL) were stocked at four densities—0.18, 0.88, 1.05, and 2.10 g l−1. Survival was high (>89%) for all treatments. Final densities ranged between 1.10 g l−1 (significantly lowest) and 10.46 g l−1 (significantly highest). The density increase was significantly higher (611%) for fish stocked at the lowest initial density (0.18 g l−1) than for fish stocked at 0.88, 1.05, and 2.10 g l−1, for which the density increase averaged 457%. In the second experiment, 4.5-month-old juveniles (0.58 ± 0.17 g and 39.54 ± 0.83 mm TL) were stocked at three densities—1.05, 3.00, and 4.00 g l−1. Survival was high (>96%) for all treatments. Final densities ranged between 4.08 and 16.53 g l−1 and were significantly higher for greater initial densities. The density increase was greatest (413%) for fish stocked at the highest density (4 g l−1) and was not significantly different for fish stocked at 1.05 and 3 g l−1. Considering all the densities in the two experiments, for stocking at 4 g l−1 the final density was 15 times higher than that reached after stocking at 0.18 g l−1, without harmful effects on survival and growth. This final density (equivalent to 16.53 kg m−3) is in the range recommended for other fish species in this period under intensive conditions.
机译：在22°C的实验室中进行的两个120天实验中，评估了放养密度对少年鲈（Tinca tinca L.）存活和生长的影响。将鱼养在玻璃纤维水箱中，向其供应自流水，并过量饲喂鲑鱼干饲料，并补充一定量的无节幼体。在第一个实验中，以四个密度（0.18、0.88、1.05和2.10 g l-1）放养四个月大的幼体（0.31±0.04 g和32.00±1.17 mm TL）。所有治疗的存活率均较高（> 89％）。最终密度在1.10 g l-1 （显着最低）和10.46 g l-1 （显着最高）之间。初始密度最低（0.18 gl-1 ）时放养的鱼的密度增加显着高于（0.88、1.05和2.10 gl-1 ）中放养的鱼（611％）。密度平均增加457％。在第二个实验中，以三种密度（1.05、3.00和4.00 g l-1）储存4.5个月大的幼体（0.58±0.17 g和39.54±0.83 mm TL）。所有治疗的存活率均较高（> 96％）。最终密度在4.08至16.53 g l-1 之间，对于更高的初始密度，其显着更高。以最高密度（4 g l-1 ）放养的鱼的密度增加最大（413％），而以1.05和3 g l-1 放养的鱼的密度增加没有显着差异。考虑到两个实验的所有密度，以4 g l-1 进行储存时的最终密度比以0.18 g l-1 进行储存后达到的最终密度高15倍，而对存活和生长没有有害影响。在密集条件下，此最终密度（相当于16.53 kg m-3 ）在此期间对其他鱼类建议的范围内。

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