Cumulative Herring Spawn Analysis
Cumulative spawn maps are based on annual, herring spawn survey measurements. Check out a recent, survey manual. Egg depositions are estimated for each kilometre of British Columbia coastline and are separately summed by kilometre over all survey years (from 1928 to the present year). Spawn habitat indices for all BC coastal kilometre segments are re-calculated annually and plotted on digital maps. See cumulative herring spawn tables for further details.
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