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Oocyte growth and fecundity regulation of Atlantic herring (Clupea harengus) in relation to declining body reserves during overwintering
Kurita, Y.; Thorsen, A.; Fonn, M.; Svardal, A.; Kjesbu, O.S. (2000). Oocyte growth and fecundity regulation of Atlantic herring (Clupea harengus) in relation to declining body reserves during overwintering, in: Norberg, B. et al. (Ed.) Proceedings of the 6th International Symposium on the Reproductive Physiology of Fish, Bergen, Norway, July 4-9, 1999. pp. 85-87
In: Norberg, B. et al. (2000). Proceedings of the 6th International Symposium on the Reproductive Physiology of Fish, Bergen, Norway, July 4-9, 1999. International Symposium on the Reproductive Physiology of Fish, 6. Department of Fisheries and Marine Biology, University of Bergen: Bergen. ISBN 82-7461-048-2. 499 pp., meer
In: International Symposium on the Reproductive Physiology of Fish. Museo Nacional de Ciencias Naturales. , meer
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  • Kurita, Y.
  • Thorsen, A.
  • Fonn, M.
  • Svardal, A.
  • Kjesbu, O.S.
Abstract
    Oocyte growth, fecundity regulation, and condition effects on fecundity for repeat spawners of Norwegian spring spawning herring were examined using periodically collected samples from July 1998 to February/March 1999. As early as July more than half of the examined fish had started vitellogenesis. Oocyte diameter increased linearly over time. Fecundity decreased from July to January by around 60% and both prevalence and average intensity of atresia were very high in October and November. Oocytes were most frequently found to be atretic at the size of 800 to 1000 µm when incorporation of lipid and solids (protein, ash and carbohydrates) also speeded up. Fecundity was strongly controlled by fish condition after October. Solids (protein) appeared to be essential in determining fecundity.
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