A comparison of egg quality and larval viability between cultured coastal cod and wild arcto-norwegian cod

Abstract

Experiments on cod eggs revealed an inverse relationship between egg diameter and mortality. Further, larvae hatching from small eggs showed a redeuced feeding ability. Other methods to characterice larval viability included behaviour studies of activity and a test to evaluate learning in the feeding ability of cod larvae and the egg parameters size, dry weight and the RNA and DNA relations. The results are discussed in relation to the problem of reproductive failure of the Arcto-Norwegian cod during cold years.