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首页> 外文期刊>ICES Journal of Marine Science >Evaluating effort regulation in mixed fisheries: a Monte Carlo approach
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Evaluating effort regulation in mixed fisheries: a Monte Carlo approach

机译：评估混合渔业的努力监管：蒙特卡洛方法

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摘要

This paper evaluates whether effort regulation could achieve the goal of protecting low-abundance species in mixed fisheries. We construct a two-species bio-economic model and compare the stock abundance ratio in the end of the fishing season with the ratio prior to the fishing. Fishers' profit maximization problem is governed by three key factors: (i) the overall efficiency of catching different species (catchability), (ii) the price of different species, and (iii) their ability to catch the favoured species separately from the less-favoured species (separability). Using a Monte Carlo sampling of feasible parameters space, we show that effort regulation has good chances (87% of the cases) of maintaining the end stock ratio near equal levels (1/2 < stock ratio <2) when the initial stock ratio is equal. If the initial stock ratio is not equal, however, there is a high risk (about 50% of the cases) that effort control increases differences in the relative species abundances, rather than diminishing them. The effects depend on whether the key factors determining fishing profitability are counteracting or reinforcing each other, and their relative strength. Our results warn against placing too much faith on the ability of effort regulation to protect species at low abundances from excessive exploitation.
机译：本文评估了努力管理是否可以实现保护混合渔业中低丰度物种的目标。我们构建了两种生物经济模型，并将捕捞季节结束时的种群丰度比率与捕捞之前的比率进行了比较。渔民的利润最大化问题取决于三个关键因素：（i）捕获不同物种的总体效率（可捕获性），（ii）不同物种的价格，以及（iii）它们分别从少到少捕获特有物种的能力偏爱的物种（可分离性）。使用可行参数空间的蒙特卡洛抽样，我们显示，当初始库存比率为时，努力调节有很好的机会（占案例的87％）将最终库存比率保持在相等水平附近（1/2 <库存比率<2）。等于。但是，如果初始存量比率不相等，则存在很高的风险（大约50％的情况），努力控制会增加相对物种丰度的差异，而不是减少相对差异。影响取决于决定捕捞获利能力的关键因素是相互抵消还是相辅相成，以及它们的相对强度。我们的结果警告不要过分相信努力努力的能力，以保护低丰度物种免于过度开发。

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