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An analysis of harvest strategies and information needs in the purse seine fishery for the Brazilian sardine

机译：分析巴西沙丁鱼围网渔业的捕捞策略和信息需求

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摘要

This paper evaluates a range of constant harvest rate, constant escapement, and effort control strategies in the purse seine fishery for the Brazilian sardine by accounting for uncertainties in the processes controlling recruitment and catchability. Control strategies are evaluated with a delay-difference simulation model representing three hypotheses about sardine stock-recruitment relationship, involving the effect of spawning stock size, depensation and cyclic environmental regimes. Strategies are compared by the predicted average catches, catch variability, and probability of stock collapse. Results from simulations are also used to evaluate the relative merits of different types of policies and to evaluate the relative values of reducing the uncertainties about sardine recruitment dynamics. Better understanding of the processes controlling recruitment is mostly needed if the fishery is to continue being managed by effort control. Constant harvest rate policies provide better trade-off among the performance indicators and appears more robust to uncertainties on the prevailing ecological processes controlling recruitment. Results from this analysis are used to discuss the type of research that would most likely provide the information needed to improve the quality of decisions in the purse seine fishery.
机译：本文通过考虑控制招募和捕捞过程中的不确定性，评估了巴西沙丁鱼围网渔业中恒定收获率，恒定逃逸和努力控制策略的范围。控制策略是用时差模拟模型评估的，该模型代表了关于沙丁鱼种群与招聘关系的三个假设，其中包括产卵规模，种群分布和周期性环境制度的影响。通过预测的平均捕获量，捕获量可变性和种群崩溃的可能性来比较策略。模拟结果还用于评估不同类型政策的相对优缺点，并用于评估降低沙丁鱼招募动态不确定性的相对价值。如果要继续通过努力控制对渔业进行管理，则最需要更好地了解控制招聘的过程。恒定的采伐率政策在绩效指标之间提供了更好的折衷，并且对于控制招聘的现行生态过程的不确定性似乎更为稳健。该分析的结果用于讨论最有可能提供提高围网围捕渔业决策质量所需信息的研究类型。

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