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Variation in growth and reproduction dynamics of fish populations substantially affects production in wild as well as domesticated fish populations. Identifying the intrinsic and environmental factors which influence the dynamics of these traits is important for stock assessment methodology and management of wild fish populations as well as for improving production in aquaculture. In this paper the relationship between growth and maturation of cod (Gadus morhua) and Atlantic halibut (Hippoglossus hippoglossus) is described using data from spawning locations along the Norwegian coast. Both species show an inverse relationship between immature growth and age/size at first spawning. Long term trends may be connected to climatic changes as well as to the increased exploitation experienced in this century. Shortterm variation may be caused by abrupt changes in the conditions for growth, e.g. due to temperature shifts and/or variation in prey abundance.

Growth Rate and Sexual Maturity in Cod (Gadus morhua) and Atlantic Halibut (Hippoglossus hippoglossus)