Effects of Feeding Period on Development, Growth, and Survival of Larvae of the Fighting Conch Strombus Pugilis Linné, 1758 (mollusca, Gastropoda) in the Laboratory
Fighting conch, Strombus pugilis, larvae were reared from hatching to settlement under two feeding schedules: larvae were fed during 12 light hours (06:00–18:00, Set A) and larvae were fed during 12 dark hours (18:00–06:00, Set B). The study evaluated the effect of food availability during the day or night on larvae development, growth and survival. Adult heart appeared at 8 d in the larvae fed at night and after 11 d for larvae fed during light hours. The settlement period was significantly shorter in larvae of Set B. The veligers fed at night were competent for settlement in between 27 to 29 d, while the settlement had not been reached 100% for the larvae fed during the day. The percentage of survival at settlement was significantly lower for larvae fed during the day (29%), while larvae fed at night presented 37%. Average larval growth was 23.26 μm d−1 for day feeding and 41.43 μm d−1 for night feeding. The siphonal length at settlement for larvae fed at night was 1496 μm. Results obtained indicate that the larvae are more efficient if cultivated when they are fed at night.
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Document Type: Research Article
Publication date: 2000-11-01
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