Abstract

The catch efficiency of towed fishing gears is the fraction of the target species in the gear path that were caught and retained. Catch efficiency is fundamental for calculating population status required for establishing fisheries management reference points. Consequently, catch efficiency has been estimated for many commercially important scallop (Pectinid) fisheries. This article synthesizes and discusses estimates of catch efficiency of towed gears used to target scallops, the methods for estimating catch efficiency and the factors that influence these estimates. There exists considerable variation in catch efficiency estimates among studies (0.1 to 0.7), and it is important that this variation is accounted for during surveys and stock assessments to avoid erroneous advice and estimates. The high variation was driven by differences in experimental conditions, estimation methods and scallop behavior. Scallop size and substrate type were the two most common reporting categories discussed in the studies and consequently should be considered the two most important drivers of catch efficiency. Other important factors such as gear specifications, and scallop species were featured in some studies. This review will be highly useful for designing catch efficiency experiments, survey design and stock assessments by understanding, and accounting for, catch efficiency variation.

摘要

拖曳式渔具的捕获效率是指渔具路径中目标物种被捕获和保留的比例。捕捞效率是计算建立渔业管理参考点所需的种群状况的基础。因此，对许多具有重要商业价值的扇贝（Pectinid）渔业的捕捞效率进行了估算。本文综合并讨论了用于捕获扇贝的拖曳装置的捕获效率的估计、估计捕获效率的方法以及影响这些估计的因素。研究之间的捕捞效率估计值存在相当大的差异（0.1 至 0.7），在调查和种群评估期间考虑这种差异很重要，以避免错误的建议和估计。巨大的变化是由实验条件、估计方法和扇贝行为的差异造成的。扇贝大小和基质类型是研究中讨论的两个最常见的报告类别，因此应被视为捕获效率的两个最重要的驱动因素。一些研究中还介绍了其他重要因素，例如齿轮规格和扇贝种类。通过理解和解释捕捞效率的变化，本综述对于设计捕捞效率实验、调查设计和种群评估非常有用。一些研究中还介绍了其他重要因素，例如齿轮规格和扇贝种类。通过理解和解释捕捞效率的变化，本综述对于设计捕捞效率实验、调查设计和种群评估非常有用。一些研究中还介绍了其他重要因素，例如齿轮规格和扇贝种类。通过理解和解释捕捞效率的变化，本综述对于设计捕捞效率实验、调查设计和种群评估非常有用。