黄、东海越冬鳀鱼的分布与水文条件的关系

RELATIONSHIP BETWEEN DISTRIBUTION AND HYDROLOGICAL CONDITIONS OF THE WINTERING ANCHOVY IN YELLOW SEA AND EAST CHINA SEA

摘要:

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。

Abstract:

In this paper the results of investigation point out: 1. The dense area of the anchovy (Engraulis japonicus)moves from north tosouth with the decreasing of temperature from November to March of next year. 2. The dense area of anchovy is mainly distributed in the tongue peak areas ofthe cold or warm water with the optimum temperature (11-13℃) and the sharplyhorizontal gradient. And its position, the size of range and the schooling show themonthly and yearly variations depending on the distribution of the optimumtemperature. 3. The anchovy has vertical. distribution during day and night. In thehomogeneous areas the fish schools usually distribute below the middle layersduring day and densely scattered in whole layers at night. However, if there existsthermo-halocline, the anchovy is mainly distributed above the thermo-halocline.