Thermal conditions and age structure determine the spawning regularities and condition of Baltic herring (<i>Clupea harengus membras</i>) in the NE of the Baltic Sea.

Despite significant effects of winter air temperature on herring spawning in the NE of the GoR, we did not observe a significant trend from 1999–2015 or significant difference in the start of spawning before and after the 1990s, indicating high plasticity of gulf herring spawning.

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