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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...
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