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本文研究了上市前的网箱暂养对千岛湖所产、经OFDC有机认证的鳙鱼的体重、丰满度及体重损耗率的影响。结果表明 ,在 6 7月水温逐渐升高 (2 4 30℃ )阶段 ,暂养鳙鱼的体重和丰满度均随时间呈指数式下降 ,而在 10 11月水温逐渐下降 (2 2 17.5℃ )阶段则随时间呈对数式下降。在不同暂养密度下和不同季节 ,鳙鱼的体重损耗率呈现不同的变化态势 :在 6 7月当暂养密度为 10 0尾 /箱 (2 72 7.6g/m3 )时 ,体重损耗率随时间呈指数式增加 ,而其他各高密度暂养组的体重损耗率均随时间呈对数式增长 ;在 10 11月 ,各密度组鳙鱼的体重损耗率均随暂养时间呈抛物线式变化 ,出现最大损耗率的时间各组均在 2 12 6d之间 ,最大损耗率出现的时间各组之间无显著差异 (P >0 .0 5 ) ,但损耗率极值的大小与暂养密度有一定关系。为了使暂养过程中的损耗降到最低 ,鳙鱼的适当暂养密度在 6 7月以 10 0尾 /箱 (2 72 7.6 g/m3 )左右为宜 ,而在 10 11月可以增加到 15 0尾 /箱 (35 97.2g/m3 ) ;暂养时间不宜超过 2 0d。
This paper studies the effect of cage holding before listing on the weight, fullness and weight loss rate of the anchovy produced by Qiandao Lake and organically certified by OFDC. The results showed that the body weight and fullness of the holding mackerel all decreased exponentially with time while the water temperature gradually decreased (22 17.5 ℃) from October to November at the gradually increasing water temperature (24 ℃) The stage is logarithmically declining over time. At different holding densities and in different seasons, the body weight loss rate of the anchovy showed a different trend: the body weight loss rate increased with the holding density of 10 0 tail per box (2 72 7.6 g / m 3) in July Time increased exponentially, while the body weight loss rates of other high-density holding groups both increased logarithmically with time. In October, the body weight loss rate of each species of fish varied parabolically with the holding time, There was no significant difference between the two groups (P> 0.05), but there was no significant difference between the maximum loss rate and the temporary holding density A certain relationship. In order to minimize losses during holding, the appropriate holding density for anchovy is about 10 0 fish per box (2 72 7.6 g / m 3) in June and increased to 15 in 10 November 0 tail / box (35 97.2g / m3); holding time should not exceed 20d.