智利竹筴鱼渔场海表温度及叶绿素浓度分布特征

Characteristics of Chilean Jack Mackerel Fishing Ground Distribution and Sea Surface Temperature and Chlorophyll-a

根据2015年3月~7月大型拖网加工船"开富号"在智利外海东部智利竹筴鱼渔场(38°~47°S、78°~93°W)得到的生产调查数据及通过NOAA卫星遥感获取的海洋环境数据(海表温度、叶绿素浓度),对该海域调查期间的竹筴鱼资源与海表温度(SST)及叶绿素浓度分布特征进行初步分析。结果显示:(1)整个调查期间平均日产量为146.33 t,其中以4月份最高,3月份最低;(2)平均CPUE为10.49 t/h,其中以7月份最高,3月份最低;(3)随着季节从秋季进入冬季,智利竹筴鱼渔场总体从南向北移动,秋季(3~5月初)的渔场由东向西移动,而冬季(5月末~7月)的渔场则突然向东转移;(4)智利竹筴鱼渔场主要分布在SST为10~18℃的海域,其中又以13~14℃的渔获率较高;(5)智利竹筴鱼渔场主要分布在叶绿素浓度为0.12~0.26 mg/m^3的海域,其中又以0.14~0.18 mg/m^3的渔获率较高;(6)随着秋冬交汇,智利竹筴鱼鱼群明显分裂成两片渔场进行聚集,其中西部渔场大规格个体占比较高。

According to the statistical data of Chilean jack mackerel from 2015 in fishing vessel ＂KAI FU HAO＂,the sea surface temperature （SST） and chlorophyll-a content obtained by satellite remote sensing from NOAA between March to July,2015 in east offshore waters of Chile （38° - 47° S,78° - 93° W）,the characteristics of resource distribution and SST,and the characteristics of resource distribution and chlorophyll-a had been analyzed in this study.The results were as follows：（1） The average daily catch of Chilean jack mackerel was 146.33 t in survey duration,and the highest catch month and lowest catch month was April and March,respectively.（2） The average CPUE of Chilean jack mackerel was 10.49 t/h,and the highest CPUE month and lowest CPUE month was July and March,respectively.（3） The fishing ground moved from south to north in survey duration,and the fishing ground moved from east to west in autumn and moved from west to east in winter.（4） The SST of Chilean jack mackerel fishing ground was distributed sea area between 10 - 18℃,the highest CPUE was between 13 - 14℃.（5） The chlorophyll-a of Chilean jack mackerel fishing ground was between 0.12 - 0.26 mg/m^3,the highest CPUE between 0.14 - 0.18 mg/m^3.（6） The Chilean jack mackerel fishing ground was divided into 2 fishing grounds,and the west fishing ground was probably composed of adult fish.