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As age of the spawning population increases, spawning begins earlier (a). Warmer temperatures mean earlier spawning to a point around 4 ; above that temperature, spawning time levels out (b)

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As age of the spawning population increases, spawning begins earlier (a). Warmer temperatures mean earlier spawning to a point around 4 ; above that temperature, spawning time levels out (b) photo copyright NOAA Fisheries taken at
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