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Abstract
Mangrove snail N. balteata is a potential aquaculture species with high nutritional and economic value. Although the artificial seeds production of this species have been successful but still having problems as low survival rate in the process by veliger larvae are transformed into spat larvae. Experiments were conducted to determine the effects of salinity and food on growth rate and survival rate of this snail in the stage of veliger larvae in Quang Ninh provice. The results showed that the optimal salinity for growth of veliger larvae was 25 ppt, that resulted in a absoluted growth rate of 8.99 ± 0.4 μm/day and survival rate of 54.11 ± 2.37%. The diet of algae combined with commercial feed was most suitable for the growth of mangrove snail at the veliger larvae stage with absoluted growth rate and the survival rate reached 10.35 ± 0.51 μm/day and 58.50 ± 3.04 %, respectively. These results could contribute technical knowledge of rearing veliger larvae of N. balteata with optimal salinity of 25 ppt and diet of algae combined commercial feed.
Key words: veliger larvae; salinity, mangrove snail, feed, growth, survival rate