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本文从拖网网次渔获量的数学表达式入手,在假设捕捞效率与拖网作业宏观技术水平呈幂函数关系的情况下,推导出底拖网作业捕捞努力量和捕捞努力量指数的教学表达式。公式表明一个海域(或渔场)所投入(或所承受)的底拖网作业捕捞努力量不仅与单位渔船数量(决定渔具数量)和单位渔船主机功率有关,而且还与渔船类型(性能)、拖网网型、作业技术水平和作业时间有关。同时,作者还探讨了各有关参数的计算方法,可为底拖网作业的捕捞努力量标准化计算提供一条新的途径,而且在进行不同底拖网网型捕捞努力量标准化的同时,也完成了其年间的标准化。因此,该公式能较全面、较真实地反映底拖网作业的捕捞努力量面貌,有助于较合面地描述和理解捕捞努力量的基本概念。
Based on the mathematical expression of trawl catch, this paper deduces the teaching expression of trawling fishing effort and fishing effort index under the assumption of a power function relationship between fishing efficiency and macroscopic technical level of trawl operation. The formula indicates that fishing effort at the bottom trawling effort invested (or sustained) by one sea area (or fishery) is not only related to the number of fishing vessels per unit (determining the number of fishing gear) and the main engine power of the fishing vessel, but also to the type of fishing vessel (performance) Type, operating skill level and working time. At the same time, the author also discussed the calculation method of all the relevant parameters, which could provide a new way for the standardized calculation of fishing effort for bottom trawling operations. Meanwhile, while standardizing on different bottom trawling fishing effort, Standardization. Therefore, the formula can reflect the fishing effort of bottom trawling work more comprehensively and truthfully, and help to describe and understand the basic concepts of fishing effort more comprehensively.