Impact of Abnormal Climatic Events on the CPUE of Yellowfin Tuna Fishing in the Central and Western Pacific

文献类型： 外文期刊

第一作者： Zhou, Weifeng

作者： Zhou, Weifeng;Hu, Huijuan;Zhou, Weifeng;Fan, Wei;Hu, Huijuan;Jin, Shaofei

作者机构：

关键词： central and western Pacific; thermocline; yellowfin tuna; CPUE; El Nino; La Nina; GAM model

期刊名称：SUSTAINABILITY （ 影响因子：3.889； 五年影响因子：4.089 ）

ISSN：

年卷期： 2022 年 14 卷 3 期

页码：

收录情况： SCI

摘要： To explore the impact of climate change on fishery resources, the temporal and spatial characteristics of the thermocline in the main yellowfin tuna purse-seine fishing grounds in the western and central Pacific Ocean during La Nina and El Nino years were studied using the 2008-2017 Argo grid data (BOA_Argo) and the log data of commercial fishing vessels. A generalized additive model (GAM) was used to analyze the variables affecting yellowfin tuna fishing grounds. The results showed that in La Nina years, the catch per unit effort (CPUE) moved westward as the high-value zone of the upper boundary contracted westward to 145 degrees E, and in the El Nino years this moved eastward to 165 degrees E. Compared with normal years, the upper boundary depth difference of the thermocline on the east and west sides of the equatorial Pacific was larger in La Nina years, and the upper boundary depth of 80-130 m shifted westward. The thermocline strength was generally weaker in the west and stronger in the east. The thermocline had two band-like distribution structures with an axis at 15 degrees N and 15 degrees S. The CPUE was distributed from 120 m to 200 m. The CPUE distribution was dense when the temperature range of the upper boundary of the thermocline was 27.5-29.5 degrees C, and the intensity was 0.08-0.13 degrees C center dot m(-1). The upper-boundary temperature had the greatest impact on the CPUE. The eastward shift of the CPUE during El Nino and the westward shift during La Nina were associated with the optimal thermocline parameter values. The factor of year had a fluctuating effect on the CPUE, and the influence of the La Nina years was greater. The areas with high abundance were 5 degrees N-5 degrees S and 150 degrees E-175 degrees E. The results showed that the changes in the thermocline caused by abnormal climate events significantly affected the CPUE.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序