Age of sexual maturation and recruitment in Pacific herring / D.E. Hay and P.B. McCarter. : Fs70-1/1999-175E-PDF

This paper presents evidence to support the contention that most Pacific herring mature sexually at age 3 in all major assessment areas of British Columbia. The paper is organized according to 3 main topics: (1) percent at age data, (2) analyses of sexual maturity, and (3) a brief analysis of some temporal and spatial factors associated with the samples of spawning fish. Within the section on analyses of sexual maturity, 2 different approaches are presented in support of the contention that age 3 herring are sexually mature: based microscopic analyses of the size composition of developing eggs (oocytes) in ovaries as criteria of maturation, and catch sampling data to support an analysis of gonad weights in conjunction with the Hjort maturity index. The paper concludes with a discussion of the implication of the results presented and recommendations concerned with stock assessment and management.

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