论文部分内容阅读
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。
From December 1997 to June 1999, a bottom trawl fishery survey was conducted on the northern shelf area of the South China Sea. The survey carried out large-scale site-specific surveys in all seasons in four seasons of Fenchun (April-June), Xia (July-September), autumn (December-December) and winter (December-February) A total of 31 species of fishes were collected, belonging to 11 genera. Through the analysis of species composition and catch rate in different regions, different seasons, different water depths and diurnal variations, the results showed that the catch rate of Beibu Gulf was the highest, the lowest in eastern Guangdong, and gradually decreased from west to east Decreasing trend. The catch rates of sablen fish in summer and winter were higher than those in spring and autumn. The variation of catch rate along the water depth was as follows: the sea depth of ≤100m water depth increased along with the increase of water depth; The catchment rate in the 80 ~ 100m sea area is relatively high. The catch rate at midnight is the lowest, reaching the highest at 14 o’clock.