A comparison is made of the fecundities of herring from Seal Rock, Washington, British Columbia, Hokkaido, Japan, and Peter the Great Bay, Siberia. Among herring of the same size, the Seal Rock fish produce more eggs than the British Columbia herring; and the British Columbia specimens bear more eggs than the Siberian herring. Among herring of the same age, the Siberian herring is far more fecund than either the herring of Seal Rock or Hokkaido. Fecundity is suggested as an additional criterion to aid in the differentiation of herring races.