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首页> 外文期刊>ICES Journal of Marine Science >Waiting for a flourishing Baltic cod (Gadus morhua) fishery that never comes: old truths and new perspectives
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Waiting for a flourishing Baltic cod (Gadus morhua) fishery that never comes: old truths and new perspectives

机译：等待永不兴旺的波罗的海鳕鱼（Gadus morhua）捕捞：旧真理和新观点

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摘要

Contrary to the declared recovery of the stock, the density-dependent growth of Eastern Baltic cod (Gadus morhua, Gadidae), probably related to increased gear selectivity, may have disrupted the size structure and substantially lowered the productivity of the stock. This naturally affects the profitability and future development of industry as well as ecosystem objectives in relation to policies such as the Marine Strategy Framework Directive. As a result, current management frameworks need to be reconsidered with a clear priority on setting objectives related to both socio-economic and ecosystem considerations. We explore various management options, using bioeconomic modelling to visualize potential trade-offs, and form an integrated decision support to inform managers regarding potential yield in biomass, revenue at both the fleet and individual levels, and environmental impact of fishing. We also investigate the consequences of preventing density-dependence by lowering selectivity, L-c, while optimizing for economic revenue and minimizing ecosystem impacts. Our findings indicate that new strategies need to be adopted by reducing L-c as well as fishing mortality, F, to restore individual growth and, hence, stock productivity. We also note that these more risk-averting strategies are positively linked to better profitability at both the individual and fleet levels as well as with enhanced ecosystem functioning and lower ecological stress.
机译：与宣布的种群恢复相反，东部波罗的海鳕鱼（加迪斯·莫尔瓦（Gadus morhua），加迪达（Gadidae））的密度依赖性生长（可能与齿轮选择性增加有关）可能破坏了大小结构并大大降低了种群的生产率。这自然会影响与海洋战略框架指令等政策相关的行业盈利能力和未来发展以及生态系统目标。结果，需要重新考虑当前的管理框架，并在确定与社会经济和生态系统考虑相关的目标方面明确地优先考虑。我们使用生物经济模型来可视化潜在的权衡，探索各种管理选项，并形成综合决策支持，以告知管理人员生物量的潜在产量，船队和个人的收入以及捕捞对环境的影响。我们还研究了通过降低选择性L-c来防止密度依赖性的后果，同时优化了经济收入并最大程度地减少了对生态系统的影响。我们的发现表明，需要通过降低L-c以及捕捞死亡率F来采取新的策略，以恢复个体生长并因此恢复种群生产力。我们还注意到，这些更多的风险平均策略与个人和船队的更好盈利能力以及增强的生态系统功能和较低的生态压力有着积极的联系。

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