EFFECT OF PHOTOPERIOD ON DEVELOPMENT AND METAMORPHOSIS OF SPINY LOBSTER (SAGMARIASUS VERREAUXI)

TL;DRAbstract

This study examined the effects of photoperiod on the growth, survival, feeding and moulting in early and late stage spiny lobster, Sagmariasus verreauxi, phyllosoma. In the first experiment, the effects of five photoperiods (0, 6, 12, 18 and 24 h photophase) were examined in the culture of larvae from hatch to instar stage 5. Phyllosoma at 6 h photophase grew larger, however, fewer survived. Phyllosoma at 6 h photophase also ingested fewer Artemia which suggested that the observed inverse relationship between growth and survival may have been a result of cannibalism. Phyllosoma cultured in continuous light were significantly smaller, probably due to an imbalance in energy uptake and consumption due to prolonged activity. Moult increment among all photoperiods was similar. These results suggest that a light dark regime is important for early stage phyllosoma and a photophase of 12 to 18 h is recommended for culture. In the second experiment, the effects of four photoperiods (6, 12, 18

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