The use of growth estimation methods that depend on unreliable age data has previously hindered the quantification of perceived differences in growth rates between the two cod stocks inhabiting the Baltic Sea. Data from cod tagged in different regions of the Baltic Sea during 2007–2019 were combined, and general linear models were fit to investigate inter-regional (defined as area of release) and inter-stock (assigned to a subset of recaptures using genetic and otolith shape analyses) differences in individual growth. An average-sized cod (364 mm) caught in the western Baltic Sea and assigned to the western Baltic cod stock grew at more than double the rate (145 mm year⁻¹) on average than a cod of the same size caught in the eastern Baltic Sea and assigned to the eastern Baltic cod stock (58 mm year⁻¹), highlighting the current poor conditions for the growth of cod in the eastern Baltic Sea. The regional differences in growth rate were more than twice as large (63 mm year⁻¹) as the stock differences (24 mm year⁻¹). Although the relative importance of environmental and genetic factors cannot be fully resolved through this study, these results suggest that environmental experience may contribute to growth differences between Baltic cod stocks.

中文翻译：

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标签捕获数据揭示了波罗的海鳕鱼当代生长的区域和特定种群差异

依赖于不可靠年龄数据的生长估计方法的使用先前阻碍了对居住在波罗的海的两种鳕鱼种群之间的增长率的感知差异的量化。合并了2007-2019年在波罗的海不同地区标记的鳕鱼的数据，并采用了一般的线性模型来研究区域间（定义为释放区域）和种群间（使用遗传和遗传方法重新捕获的子集）耳石形状分析）个体生长的差异。在波罗的海西部捕捞并分配给波罗的海鳕鱼的平均大小的鳕鱼（364毫米）比东部捕捞的相同大小的鳕鱼的平均增长率（145毫米年^-1）平均高出一倍以上波罗的海并划归波罗的海东部鳕鱼种群（58毫米年^-1），突出了目前波罗的海东部鳕鱼生长的恶劣条件。增长率的区域差异（63 mm年^-1）是存量差异（24 mm年^-1）的两倍以上。尽管不能通过这项研究完全解决环境和遗传因素的相对重要性，但这些结果表明，环境经验可能有助于波罗的海鳕鱼种群之间的生长差异。