Relationship between the temporal-spatial distribution of longline fishing grounds of yellowfin tuna and the thermocline characteristics in the Western and Central Pacific Ocean

Yang Shenglong; Zhang Bianbian; Jin Shaofei; Fan Wei

doi:10.3969/j.issn.0253-4193.2015.06.008

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Yang Shenglong, Zhang Bianbian, Jin Shaofei, Fan Wei. Relationship between the temporal-spatial distribution of longline fishing grounds of yellowfin tuna and the thermocline characteristics in the Western and Central Pacific Ocean[J]. Haiyang Xuebao, 2015, 37(6): 78-87. doi: 10.3969/j.issn.0253-4193.2015.06.008

Citation:

Yang Shenglong, Zhang Bianbian, Jin Shaofei, Fan Wei. Relationship between the temporal-spatial distribution of longline fishing grounds of yellowfin tuna and the thermocline characteristics in the Western and Central Pacific Ocean[J]. Haiyang Xuebao, 2015, 37(6): 78-87. doi: 10.3969/j.issn.0253-4193.2015.06.008

Citation:

Yang Shenglong, Zhang Bianbian, Jin Shaofei, Fan Wei. Relationship between the temporal-spatial distribution of longline fishing grounds of yellowfin tuna and the thermocline characteristics in the Western and Central Pacific Ocean[J]. Haiyang Xuebao, 2015, 37(6): 78-87. doi: 10.3969/j.issn.0253-4193.2015.06.008

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Relationship between the temporal-spatial distribution of longline fishing grounds of yellowfin tuna and the thermocline characteristics in the Western and Central Pacific Ocean

doi: 10.3969/j.issn.0253-4193.2015.06.008

1.
Key Laboratory of East China Sea & Oceanic Fishery Resources Exploitation and Utilization, Ministry of Agriculture, Shanghai 200090, China;Key and Open Laboratory of Remote Sensing Information Technology in Fishing Resource, East China Sea Fisheries Research Institute, Shanghai 200090, China
2.
Key Laboratory of East China Sea & Oceanic Fishery Resources Exploitation and Utilization, Ministry of Agriculture, Shanghai 200090, China
3.
Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China

Received Date: 2014-09-22

Abstract

Abstract

We evaluated the isoline distribution of thermocline characteristics (the upper and lower boundary temperatures and depths) in the yellowfin tuna (Thunnus albacares) fishing grounds in Western and Central Pacific Ocean. We plotted the thermocline characteristics contour on a spatial overlay map using data collected on a monthly basis from Argo buoys and monthly CPUE (catch per unit effort) from yellowfin tuna longlines from the Western and Central Pacific Fisheries Commission (WCPFC). In addition, frequency analysis and the empirical cumulative distribution function (ECDF) were used to calculate the optimum ranges for the thermocline characteristics of the central fishing grounds. Our analysis suggested that there were significant seasonal variations in the upper boundary temperature and depth of the thermocline in the central fishing grounds, which significantly influenced the temporal and spatial distribution of the yellowfin tuna population. However, the lower boundary temperature and depth of thermocline has little seasonal variation. The overlay maps suggest that the central fishing grounds were observed in areas where the upper boundary depth of thermocline was deeper, and south-north moved follow by thermocline. The values between 70 and 100 m in the east zonal areas of New Guinea, and the central fishing grounds were found all year. The fishing grounds distributed where the upper boundary temperature of the thermocline was higher than 26℃, but CPUE was lower than Q3 while temperature higher than 30℃. The fishing grounds located between the two high value shape of the lower boundary depth of thermocline, if the depth was more than 300 m or less than 150 m, the CPUE tended to be low. The lower boundary temperature of the thermocline in the fishing grounds was lower than 13℃ all year in the equatorial zone. Conversely, if the temperature was higher than 17℃, the hooking rates are very low. Frequency analysis and the empirical cumulative distribution function (ECDF) were used to calculate the optimum range of thermocline characteristics. The optimum depth range of the upper boundary temperature and depth were 27-29.9℃ and 70-109 m .The optimum depth range of the lower boundary and the lower boundary temperature were 250-299 m and 11-13.9℃, respectively. The results were confirmed by using the Kolmogorov-Smirnov test. A preliminarily indication of the optimum distribution interval and seasonal change characteristics of each thermocline in the longline central fishing ground of yellowfin tuna was obtained in this paper. The conclusion could provide a reference for improving the efficiency of yellowfin tuna longline fishing and aid tuna resource management in Western and Central Pacific Ocean.
- Thunnus albacares,
- Western and Central Pacific Ocean,
- thermocline,
- Argo

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References(28)

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