Diversity of circadian organisation and light sensitivities among teleosts species
The photoperiod entrainment of reproduction in fish is highly divergent with species entraining to signals that are most relevant to their surrounding environment. Intensive aquaculture is increasingly reliant on artificial photoperiod manipulation to regulate reproduction. This work thus aimed to better characterise the diversity of circadian organisations and light sensitivities among teleost species. The demonstration of the use of retinas for non visual light perception in tilapia and to a lesser extent cod and sea bass has implications for the definition of the neuroendocrine system used to entrain sexual maturation. These results have significant implications for the design of culture systems to manage reproduction during commercial on-growing, requiring species specific lighting systems to be designed.