Genotypic response to photoperiod treatment in Atlantic cod (Gadus Morhua)

Continuous light enhanced growth at both temperatures. However, a significant interaction between genotypes and photoperiods was found at both temperatures, demonstrated by the variation in genotype response towards photoperiod treatment. At both temperatures the highest growth rates were found for Hb-I(2/2) at LD24:0, whereas the lowest overall mean growth rates were found for the same genotype reared at LDN. Conversely, the Hb-I(1/1) genotype displayed the fastest specific growth rates in the LDN groups at both temperatures.