Discrimination by External Features between Alewife (Alosa pseudoharengus) and Blueback Herring (A. aestivalis)

Abstract
This study reviews methods formerly recommended for discriminating between the alewife (Alosa pseudoharengus) and blueback herring (A. aestivalis) and suggests an alternate, more efficient, external species-specific character. The method relies on differences in scale imbrication patterns and scale morphology.Key words: alewife, Alosa pseudoharengus; blueback herring, A. aestivalis; morphology, meristics, identification

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