论文部分内容阅读
越冬鳀鱼密集区主要分布于最适水温(11～13℃)水平梯度大的冷水或暖水舌锋区,其水平位置,范围大小和鱼群密集程度随最适水温分布趋势的逐月变化和年际变化而发生变化。 鳀鱼垂直分布有昼夜变化。在无温、盐跃层水域,白天鳀鱼分布于中下层或近底层,且易集成小群;夜间鱼群分散,几乎分布于整个水层。但在有温、盐跃层的水域,因受跃层的影响,鳀鱼常常分布于跃层之上的水层。
The wintering tuna intensive area is mainly distributed in cold water or warm water tongue frontal area with the most suitable water temperature (11 ~ 13 ℃), and its horizontal position, range size and fishy density change with the trend of the optimum water temperature And change from year to year. Anchovy vertical distribution of diurnal changes. In the warm, salty waters, the anchovy fish distribute in the lower and middle or near the bottom during the daytime, and are easy to integrate with small groups; the fish disperse at night and distribute almost throughout the water layer. However, in warm and salty waters, catfish are often distributed in the water layer above the thermocline due to the influence of the thermocline.