南海北部陆架区海域科鱼类的分布

Distribution of the Carangidae fishes in the continental shelf waters of northern South China Sea

1997年12月至1999年6月对南海北部陆架区海域进行了底拖网渔业资源调查。调查分春(4-6月)、夏(7-9月)、秋(10-12月)、冬(12-2月)4个季节,每个季节都进行全海域的大面积定点调查,共采获科鱼类31种,分隶属于11属。通过对渔获种类组成和渔获率在不同区域、不同季节、不同水深以及昼夜变化等的分析,结果表明,北部湾海区的渔获率最高,粤东海区最低,并由西往东呈逐渐递减的趋势;夏、冬季科鱼类的渔获率较高,而春、秋季较低;渔获率沿水深梯度的变化为≤100m水深海域沿水深的增加而增加,>100m水深海域随水深的增加而下降,以80～100m海域的渔获率相对较高;午夜的渔获率最低,14时最高。

A fishery resources survey was conducted with demersal trawl in northern continental shelf waters of the South China Sea in spring (April to June), summer (July to September), autumn (October to December) and winter (December to February) from December 1997 to June 1999. A total of 31 species of Carangidae fishes was caught in the survey, belonging to 11 genera. The paper analyzes the distribution and variation of catch rates of the Carangidae species. The results show that the catch rates decrease gradually west to east, the highest in Beibu Gulf and the lowest in Yuedong waters; along water depth gradient, however, the catch rates increase with water depth within 100m fathom line, while beyond 100m deep, the catch rates decrease with water depth, so the higher catch rates occur between 80～100m waters. In addition, with respect to season, the catch rates are higher in summer and winter than those in spring and autumn, but as for day and night, the catch rates are lower at night than by day, the minimum at midnight, while the maximum at 14:00, mainly because of diurnal vertical migration.