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首页> 外文期刊>ICES Journal of Marine Science >Two- And Three-dimensional Maturation Reaction Norms For The Eastern Baltic Cod, Gadus Morhua
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Two- And Three-dimensional Maturation Reaction Norms For The Eastern Baltic Cod, Gadus Morhua

机译：波罗的海东部鳕鱼的二维和三维成熟反应范数，Gadus Morhua

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摘要

Industrial fisheries have caused decreases in the size and age at maturation in several stocks of cod (Gadus morhua). Although earlier maturation can be a phenotypic response to improved growth conditions, estimation of probabilistic maturation reaction norms (PMRNs) can remove most impacts of growth and demography from maturation schedules and has often revealed a residual, potentially genetic, trend. In this study, size- and condition-based PMRNs were estimated for eastern Baltic cod cohorts from 1987 to 2003. The PMRNs suggested that both length and condition at 50% probability of maturing (Lp_(50) and Cp_(50)) had decreased by 15-20%, more notably in females. Simultaneously with changes in maturation schedules, the length-at-age of mature fish decreased for most combinations of age and sex. Decrease in growth may be partly explained by advanced maturation, but temporal fluctuations in PMRNs suggest also a residual environmental impact on both growth and maturation. The results may indicate a genetic change in the eastern Baltic cod stock, adding pressure to reduce fishing mortality on it.
机译：工业渔业已导致几种鳕鱼种群的成熟期尺寸和年龄减少。尽管较早的成熟可能是对生长条件改善的表型响应，但概率成熟反应规范（PMRN）的估计可以从成熟时间表中消除生长和人口统计学的大部分影响，并且经常揭示出残留的，潜在的遗传趋势。在这项研究中，估计了1987年至2003年波罗的海东部鳕鱼队列的基于大小和条件的PMRN。PMRNs提示，长度和条件在50％的成熟概率下都降低了（Lp_（50）和Cp_（50））增长15-20％，尤其是女性。与成熟时间表的变化同时，大多数年龄和性别组合的成年鱼的体长减少了。生长下降的部分原因可能是成熟期提前，但PMRNs的时间波动也表明残留环境对生长和成熟都有影响。结果可能表明波罗的海东部鳕鱼种群发生了遗传变化，增加了降低其捕捞死亡率的压力。

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