Each Spring, vast schools of Pacific herring migrate from offshore waters to the waters close to shore. They come to these protected areas for one reason: To spawn. At this time, the females’ eggs (roe) are at their peak maturity. The male herring release their sperm (milt) into the water to fertilize the released roe. […]
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source https://photofocus.com/photography/the-pacific-herring-spawn-a-photo-essay/
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