effect of photoperiod on growth and survival
the resulted present in Experiment 1 indicate that increasing the daylength resulted in improved growth and survival of obscure puffer larvae from 3 dah (frist feed) to 19 dah. The optimal photoperiod for the obscure puffer larvae was continuous light . this optimal photoperiod was same as that for the embryos of this species
a longer daylength resulted in better larval growth and survival because the reliance on visual cues for feeding is common in most teleosts and it probably increased the probability of the larval to feed. in the present study, a long daylength resulted in favorable effect on the growth and survival of obssure puffer larvae . the same trend were obtained with freshwater sheat-fish in a afforded an increased opportunity for the larvae to encounter food organisms and