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Maturation in the Barents Sea capelin – Contrasting length- and gonad-based metrics
Fisheries Research ( IF 2.4 ) Pub Date : 2021-01-25 , DOI: 10.1016/j.fishres.2021.105880
N.O.A.S. Jourdain , E. Fuglebakk , S. Subbey

It is assumed that maturation in the Barents Sea capelin is length-dependent, and that fish of at least 14 cm will potentially spawn. Current assessment and management models for the stock are based on this assumption of constant maturity at length (MaL). Using data from scientific surveys, this paper examines the validity of the constant MaL assumption, and contrasts it with maturation based on examination of fish gonads. Our analyses, based on time series of 16 years, show that MaL-based estimates of the proportion of maturing stock usually exceed gonad-based estimates. The difference varies consistently with time, and stock-size. We discuss the consequence of our results in the context of uncertainty associated with the current harvest rule.



中文翻译:

巴伦支海毛鳞鱼的成熟-基于长度和性腺的指标对比

假定巴伦支海毛鳞鱼的成熟取决于长度,并且至少有14厘米的鱼可能会产卵。当前的股票评估和管理模型基于恒定期限(MaL)不变的假设。利用科学调查的数据,本文检验了恒定MaL假设的有效性,并将其与基于鱼性腺检查的成熟度进行了对比。我们基于16年的时间序列的分析表明,基于MaL的成熟种群比例估计值通常超过基于性腺的估计值。差异随时间和库存量而变化。我们在与当前收获规则相关的不确定性的背景下讨论结果的结果。

更新日期:2021-01-25
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