智利竹筴鱼渔场海表温度及叶绿素浓度分布特征

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。

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

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/m3, the highest CPUE between 0.14~0.18 mg/m3. ⑥ The Chilean jack mackerel fishing ground was divided into 2 fishing grounds, and the west fishing ground was probably composed of adult fish.