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首页> 外文期刊>ICES Journal of Marine Science >Effect of changes in reproductive potential on perceived productivity of three Northwest Atlantic cod (Gadus morhua) stocks
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Effect of changes in reproductive potential on perceived productivity of three Northwest Atlantic cod (Gadus morhua) stocks

机译：繁殖潜能变化对西北大西洋鳕（Gadus morhua）3种种群感知生产力的影响

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摘要

Variation in maturity-at-age, sex ratio, and potential egg production (through changes in length at age) were examined for northern cod (NAFO Division 2J + 3KL), southern Grand Bank cod (3NO), and southern Newfoundland cod (3Ps). All showed significant interannual variability in each stock. Estimates of reproductive potential were produced by sequentially incorporating estimates of proportion mature at age, sex ratio at age, and potential egg production. The estimates of reproductive potential produced by each method were broadly similar, but there were important differences. This leads to differing perceptions of stock productivity, as measured by relative rate of recruitment of a stock and in the spawning stock produced per recruit. These differing perceptions can have a major impact on expectations for the recovery of depleted stocks and the sustainability of various levels of fishing. Efforts should be made to improve estimates of reproductive potential by further exploring the impacts of changes in the spawning characteristics of populations, and by collecting such basic information as fecundity data.
机译：检查了北部鳕鱼（NAFO Division 2J + 3KL），南部大银行鳕鱼（3NO）和南部纽芬兰鳕鱼（3Ps）的成熟度，性别比和潜在产蛋量的变化（通过年龄的变化）。 ）。所有股票均显示每只股票具有重大的年际变化。生殖潜力的估算是通过依次纳入年龄成熟的比例，年龄的性别比和潜在的产卵量来估算的。每种方法产生的生殖潜力的估算值大致相似，但存在重要差异。这导致对种群生产力的不同看法，这是通过种群的相对招聘率和每位参与者生产的产卵种群来衡量的。这些不同的看法可能对人们对枯竭种群的恢复以及各级捕鱼的可持续性的期望产生重大影响。应通过进一步探讨种群产卵特性变化的影响，并收集诸如繁殖力数据等基本信息，努力提高对生殖潜力的估计。

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