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Sexual maturation in cod (Gadus morhua L.) in relation to strain, temperature, sex, size and haemoglobin type
Johansen, T.; Nyhammer, G.; Otterlei, E.; Naevdal, G. (2000). Sexual maturation in cod (Gadus morhua L.) in relation to strain, temperature, sex, size and haemoglobin type, 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. 343
In: Norberg, B. et al. (Ed.) (2000). Proceedings of the 6th International Symposium on the Reproductive Physiology of Fish, Bergen, Norway, July 4-9, 1999. Department of Fisheries and Marine Biology, University of Bergen: Bergen. ISBN 82-7461-048-2. 499 pp., more
In: International Symposium on the Reproductive Physiology of Fish. Museo Nacional de Ciencias Naturales, more

Available in Authors 
    VLIZ: Proceedings [4290]

Keyword
    Marine

Authors  Top 
  • Johansen, T.
  • Nyhammer, G.
  • Otterlei, E.
  • Naevdal, G.

Abstract
    Culture raised one year old cod originating from two strains, Northeast Arctic (NEAC) and coastal cod (CC), were kept at three temperatures, 8, 12 and 15 degree C. Rate of maturation, gonadosomatic (GSI) and hepatosomatic index (HSI) in their second year of life was recorded and is presented as function of strain, individual growth rate and haemoglobin type within the temperature groups. Nearly all CC were maturing or ripe at the end of the experiment, while about one fifth of the NEAC still were immature. GSI was on average higher among the CC fish than among the NEAC fish, and a slight correlation between GSI and HSI was observed.

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