Parent-Progeny Relationships and Implications for Stock-Recruitment Theory in Atlantic Cod

Abstract

Fish recruitment models are being improved through our increased understanding of maternal and paternal trits that influence embryonic and iarval fitness. New knowledge of the reproductive and developmental biology of Atlantic cod (Gadus morhua), a species exploited for centuries, has fueled further paradigm shifts in stock-recruitment theory that foster an ever increasing conservation perspective. Quantifying parental characteristics that affect future cohort strength requires refined data treatment that integrates annual variation in adult body metrics and demography that in turn influence egg and sperm quality and larval survivorship. Long-term research and stock assessment programs are recommended. These programs will lead to predictions of retrospective and future recruitment levels that are based to a greater degree on reproductive biology.