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首页> 外文期刊>Fisheries and Aquatic Sciences >Effect of High Stocking Rates on Growth and Survival of the Endangered Rio Grande Silvery Minnow Hybognathus amarus
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Effect of High Stocking Rates on Growth and Survival of the Endangered Rio Grande Silvery Minnow Hybognathus amarus

机译：高放养率对濒临灭绝的里奥格兰德银小Silver鱼Hybognathus amarus生长和存活的影响

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摘要

The endangered Rio Grande silvery minnow Hybognathus amarus was cultured in 2.44-m-diameter outdoor tanks in a 131-day yield trial to assess growth, survival, and percentage of taggable-sized fish ( total length) when stocked at 500/tank (1.07 million/ha), 1,000/tank (2.14 million/ha), and 1,500/tank (3.21 million/ha). At harvest, fish averaged 45.6 mm and 0.94 g in the 500/tank treatment, 42.6 mm and 0.74 g in the 1,000/tank treatment, and 38.4 mm and 0.55 g in the 1,500/tank treatment; the differences were significant (P = 0.05). Survival in the three treatments was 70%, 64%, and 52%, respectively, but the differences were not significant. Percent taggable-sized fish was 86%, 89%, and 65%, respectively, but the differences were not significant. Yield was 672.5 kg/ha, 1,026.6 kg/ha, and 887.8 kg/ha, respectively; yield in the 1,000/tank treatment was significantly greater than that in the 500/tank treatment, but was not significantly greater than that of the 1,500/tank treatment. This facility is a conservation facility and a major goal is to raise fish without formulated feed. Fertilization produced good growth for the first month, but little growth occurred during the second month so supplemental feed had to be used for the final 60 d of the yield trial.
机译：在131天的产量试验中，将濒临灭绝的里约格兰德银色小鱼Hybognathus amarus在直径为2.44米的室外水箱中进行养殖，以评估以500只/箱的储量（1.07）时鱼的生长，存活率和可加标签大小的鱼（总长）的百分比。 （百万/公顷），1,000 /储罐（214万/公顷）和1,500 /储罐（321万/公顷）。收获时，在500 /桶处理中鱼平均为45.6毫米和0.94 g，在1000 /桶处理中鱼平均为42.6毫米和0.74 g，在1500 /桶处理中鱼分别为38.4毫米和0.55 g;差异显着（P = 0.05）。三种治疗的存活率分别为70％，64％和52％，但差异不显着。可标记大小的鱼类百分比分别为86％，89％和65％，但差异不显着。产量分别为672.5千克/公顷，1,026.6千克/公顷和887.8千克/公顷; 1,000 /罐处理的产量显着高于500 /罐处理的产量，但不明显高于1,500 /罐处理的产量。该设施是一个保护设施，主要目标是在不配制饲料的情况下饲养鱼类。施肥在第一个月生长良好，但在第二个月几乎没有生长，因此在增产试验的最后60天必须使用补充饲料。

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