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Abstract
In this study we examined possible effects of night feeding (30% of daily ration) and salinity on survival, growth and feed conversion ratio (FCR) of the Indian shrimp Penaeus indicus via a split-plot experiment with salinity as the main-plot factor (15 and 30 ppt) and feeding regime as the sub-plot factor (DO: day only, and DAN: day and night). Results show that salinity strongly affect all the observed parameters. Shrimps grown at 30 ppt had significantly higher survival, FCR and growth than those grown at 15 ppt (P < 0.05). Feeding shrimp 30% of daily ration at night improved growth (P < 0.05), but had no effect on survival or FCR (P > 0.05). There was, however, no interaction between the two examined factors: salinity and feeding regime (P > 0.05). We therefore suggest that salinity of 30 ppt and night feeding should be applied in farming Penaeus indicus for growth improvement, reduction of crop length and feed cost.
Keywords: Penaeus indicus, growth, salinity, feeding regime