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温跃层特性与金枪鱼表层渔业的捕捞成功率有关,但温跃层特性随海域与季节的不同而变化,因此对于捕捞成功率的影响也不同。分析了中西太平洋我国金枪鱼围网船队作业渔场的温跃层特性,并结合海上实测的围网沉降性能与对应的生产资料,探讨了金枪鱼围网捕获成功率与温跃层特性的关系,结果表明:(1)调查期间91.2%的网次所对应的温跃层顶界深度超过100 m,温跃层顶界深度较深是该海域渔场温跃层的重要特征;(2)围网最大沉降深度的95%置信区间为[185.0,197.8]m,渔场温跃层顶界深度的95%置信区间为[146.0,158.3]m,网具穿越温跃层顶界后继续沉降的深度的95%置信区间为[34.3,44.0]m;(3)相关分析表明,本研究中金枪鱼围网的捕获成功率与温跃层特性并不存在显著的相关性(P>0.05),这可能是由于当地渔场较深的温跃层顶界深度使得目标鱼种在网具到达温跃层之前拥有充分的逃逸时间和空间,从而导致温跃层内急剧变化的温度梯度失去了阻碍作用。
The characteristics of the thermocline are related to the success rate of fishing in tuna surface fisheries, but the thermocline characteristics vary with the sea area and season, so the impact on the success rate of fishing is also different. Based on the analysis of the thermocline characteristics of the operating fishing grounds of the Chinese tuna seine fleet in the Western and Central Pacific Ocean, the relationship between the success rate of capture and the thermocline characteristics of tuna purse seine was discussed based on the measured seine settlement and corresponding production data. The results show that: (1) 91.2% of the grids in the survey correspond to a depth of the top of the thermocline exceeding 100 m, and the deep top of the thermocline is an important feature of the thermocline in the fishery of the area; (2) The 95% confidence interval for the settlement depth was [185.0,197.8] m. The 95% confidence interval for the top depth of the thermocline in the fishery was [146.0,158.3] m. The depth of the settlement of the relics after reaching the top of the thermocline % Confidence intervals were [34.3,44.0] m. (3) Correlation analysis showed that there was no significant correlation between the success rate of tuna purse seine and thermocline characteristics in this study (P> 0.05), which may be due to The deep depth of the top of the thermocline at the local fisheries allows the target species to have sufficient escape time and space before the mesh reaches the thermocline, resulting in a hurdle of the rapidly changing temperature gradient within the thermocline.