Abstract
The effect of photoperiod (light/dark cycle) on the development of the central glutamate system was investigated in tilapia, Oreochromis mossambicus. Tilapia, at 0, 5, and 10 days posthatching were respectively divided into three equal groups to be kept in different photoperiods: 12/12 h, 24/0 h (full day), and 0/24 h (full night). Neither the full-day nor the full-night photoperiod showed any influence on the development of the central glutamate system, including glutamate content and mRNA expression of glutamate receptor 3α, in the developing tilapia brain. These results suggest that neither constant light nor dark photoperiods affected the influence of the central glutamate system on brain sex differentiation in tilapia during the early developing period.
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