| Summary: | 18 páginas, 3 figuras, 6 tablas.-- Scientific Council Meeting Ovaries of cod from Flemish Cap were sampled at three different times during the reproductive cycle. We study the use of the oocytes in the circumnuclear ring, cortical alveoli and vitellogenesis stages, the postovulatory follicles and gonosomatic index for the identification of females at the beginning of the ripening. The results obtained indicate that there is a period of less than two months between the end of spawning and the beginning of the development of the cortical alveoli stage, and more than three months to the beginning of vitellogenesis in all mature females. It is necessary to wait for these periods to use these structures to identify all the females at the beginning of ripening. Postovulatory follicles last a long time in the ovary, and their identification is possible seven months after spawning; the reconstruction of the last maturation ogive can be made three months after spawning. The mean gonosomatic index of mature and immature females showed significant differences three months after spawning, but the overlap between the maximum and minimum values impedes the use of this index to identify all females at the beginning of ripening. Peer reviewed
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