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Periodical of Ocean University of China. 2019, (11) Core

Relationship Between the Resource Distribution of Scomber japonicus and Seawater Temperature Vertical Structure of Northwestern Pacific OceanChinese Full TextEnglish Full Text (MT)

WANG Liang-Ming;LI Yuan;ZHANG Ran;TIAN Yong-Jun;ZHANG Jun;LIN Long-Shan;College of Fisheries, Ocean University of China;Third Institute of Oceanography,State Oceanic Administration;Key Laboratory of Open-Sea Fishery Development, Ministry of Agriculture;South China Sea Fisheries Research Institute, Chinese Academy Fishery Sciences;

Abstract: Scomber japonicus is a cosmopolitan pelagic species widely distributed in the Northwsetern Pacific and its adjacent sea areas. For the S. japonicus around Northwestern Pacific, there are two stocks, the Tsushima Current stock and the Pacific stock. The samples that were analyzed in this study all belonged to the Pacific stock, which were collected in the Northwestern Pacific high seas. Based on catch data from a light-purse seine fishing vessel and temperature data in the Northwestern Pacific Ocean from April to June 2015 and May to July 2016, the relationships among catch rate of S. japonicus, surface temperature and vertical temperature structure were studied. The results indicated that the density of resource of S. japonicus during spring（736.94 kg/h） was higher than that during summer（498.87 kg/h）; the seasonal variation in the fishing grounds of S. japonicus was not so obvious, the catch was mainly concentrated in the waters near 40°N, 151°E～153°E in spring, and in the waters near 41°N, 154°E～160°E in summer. The suitable sea surface temperature（SST） in the fishing grounds was 7～19 ℃ in spring and 8～24 ℃ in summer, the optimum SST of S. japonicus was different, which was 11～15 ℃ in spring and 8～12 ℃ in summer. The temperature gradients of 0～50 m, 50～100 m and 0～100 m in different seasons were analyzed, which indicated that the temperature gradient in fishing ground was significantly different between spring and summer, the catch rate of S. japonicus in the class interval of 0.10～0.15 ℃/m was the highest in spring, and the others were lower significantly. However, the catch rate of S. japonicus decreased with the increase in the temperature gradient from 50 to 100 m in summer, and the catch rate in the class interval of-0.05～0.00 ℃/m was higher than that of others. The degree of grey incidence（0.991） indicated that the temperature gradient form 50 to 100 m was the greatest factor affecting the catch of S. japonicus, which was followed by the latitude, longitude and T50. Simultaneously, the vertical structure of temperature at the three representative stations were analyzed, which showed that the station with thermocline in the range of 50～100 m had higher catch. Therefore, the catch of S. japonicus was closely related to the formation of thermocline in the range of 50～100 m.
Keywords：

Northwestern Pacific Ocean; light-purse seine; Scomber japonicus; resource distribution; sea surface temperature; vertical temperature structure;

  • DOI：

    10.16441/j.cnki.hdxb.20180174

  • Series：

    (A) Mathematics/ Physics/ Mechanics/ Astronomy; (D) Agriculture

  • Subject：

    Resources Science; Aquaculture and Fishery

  • Classification Code：

    S931

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