Molecular investigations on sex determination and differentiation pathways in the common carp, Cyprinus carpio

TL;DRAbstract

Common carp is a highly important species, with significant aquaculture production and frequent use for fish biology and aquaculture research. In Australia, New Zealand and the US, common carp are declared as an invasive pest causing damage to endemic ecosystems. This thesis aims to advance our understanding of the molecular pathway of sex determination and differentiation in common carp with a view to facilitate the development of genetic control mechanisms in this species. The objective was addressed by the molecular cloning of six key genes involved in sexual development, 3 each critical for female and male development. Spatial expression of these genes was analysed in adult tissues and the onset and timing of expression was determined during early ontogeny and through larval development at two temperatures (20 and 25 °C) allowing investigation of the effect of temperature on expression and final sex ratios. The study confirms that there are two isoforms of the cytochrome P450 a

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