摘要
从1986～2002年闽南-台湾浅滩渔场29组灯光围网信息船渔捞日志中提取了鲐鲹鱼类多年月平均的渔获量数据，按单位捕捞努力量的渔获量（CPUE）〈1．0t／网次、1．0≤CPUE〈2．0t／网次、CPUE≥2．0t／网次3个量级，计算其出现的网格数（GN），同时以CPUE为权重计算渔场面积指数（AI）。结果表明：台湾海峡南部鲐鲹鱼类资源分布的逐月变化特征显著，不同量级的CPUE出现面积的逐月变化各不相同，高资源密度出现最大面积的时间为3月和8～9月；AI值逐月变化的空间差异显著，8月大陆沿岸区出现最高的AI值（1．10），台湾浅滩区年平均的AI值为最高（0．70）。
Based on the logbooks of lighted purse-seine fishery of 1986 - 2002, monthly time-space distribution of the fishery resources of Chub Macherel and Round Scab of the shallow fishing ground in the southern Tatwan Strait is analyzed. Three categories, which are referred to as low, medium and high rates, are defined based on CPUE of less than 1.0 ton/net,equal to or greater than 1.0 ton/net but less than 2.0 ton/net,and equal to or greater than 2.0 ton/net. The grid number（GN）of each category is counted to estimate the areal change of certain CPUE. It is found that the GN, of different rates have different monthly pattern. The GN of high rate changes most significantly among the three. It rapidly increases from July to August by 25 ,approximated to an increase of fishing area of 7 862.5 km^2 ,and it drops from September to October by 18,approximated to a decrease of fishing area of 5 661 km^2.
Using CPUE as the weighting factor and 1-3 weighting coefficients were given to the three categories, the areal index of fishing ground（AI） is further constructed to show the change of the catchability of Chub Macherel and Round Scad. A strong seasonal variation of the catchability is found for the coastal region off southern Fujian-eastern Guangdong but not in the vicinity of the Taiwan Bank and Penghu Islands. Monthly AI could increase by a factor of up to 10 from winter to summer in the coastal waters of the mainland,while the year-round change is about a factor of 3 in the offshore region. The highest monthly AI（1.10）occurred in August in the coastal waters of the mainland,while the highest annual mean AI（0. 70）occurred in the offshore region in the vicinity of the Taiwan Bank. This temporal -spatial variation of catchability is highly related to the variation of upwelling, which contributes to high primary production by pumping cold and nutrient-rich water to the upper water.
出处
《海洋学研究》
北大核心
2008年第3期18-24,共7页
Journal of Marine Sciences
基金
国家自然科学基金资助项目(40521003)
教育部长江学者和创新团队发展计划
厦门大学新世纪优秀人才支持计划联合资助项目
关键词
鲐鲹鱼类资源
CPUE
时空分布
台湾海峡南部
Chub Macherel and Round Scad
CPUE
temporal-spatial distribution
the southern Taiwan Strait
