南极磷虾渔业CPUE及其丰度估算适用性

Catch per unit effort of Antarctic krill(Euphausia superba) fishery and its suitability to abundance estimation

作为一种衡量渔业资源丰度变化的指标,CPUE常用于多种渔业资源评估。南极磷虾作为一种集群性的生物资源,其资源存在着较为明显的时空变化特征,加之该物种本身所具有的特殊性以及渔业特点,这也使得采用CPUE作为衡量该资源丰度指标的有效性存在着较大的不确定性。为此,本实验详细介绍了4种南极磷虾渔业CPUE的常用估算方法,并总结了这些方法所具有的特点、优势以及劣势,在此基础上从时空尺度和环境影响因素等方面对南极磷虾渔业CPUE估算的影响进行了分析。最后,实验就CPUE作为评估南极磷虾资源丰度的适用性及可行性进行了探讨。近年来,南极磷虾渔业日益受到全球的关注,但如何将渔业调查数据纳入到南极磷虾资源评估当中,一直未得到统一的结论,从而导致基于生态系统的南极磷虾渔业管理进展缓慢,本研究结果可为更好地开展南极磷虾资源评估和丰度估算提供思路。

Normally, catch per unit effort（CPUE） is the total catch in a specific period（such as, year, month or season） divided by the total amount of effort used to harvest the catch in the corresponding period. As an index of measuring the abundance variation of fishery resources, CPUE is often used for fishery stock assessments. As a living marine resource with aggregation trait, the abundance of Antarctic krill has a significant spatial-temporal variation. Additionally, particularities of this species and fishery characteristics result in remarkable uncertainty in efficiently measuring the variation of abundance. Thus, this review provides detailed information on four methods to calculate CPUE of Antarctic krill fishery and summarizes the characteristics, advantages and disadvantages of these methods, and further analyzes the impacts of estimating CPUE of Antarctic krill fishery in view of temporalspatial scale and environmental factors. The suitability and feasibility of CPUE being considered as an index of abundance were also discussed. In recent years, Antarctic krill fishery has attracted more attention worldwide,however, there is no consistent argument on how to include fishery survey data into krill fishery stock assessment,which hampers the development of ecosystem-based Antarctic krill fishery management. The conclusion derived from this review can provide ideas for conducting better stock assessment and abundance estimation of Antarctic krill resources.