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Effect of reduced salinities on nursing senatorial scallop (Mimachlamys senatoria) larvae  [2010]

Saroj Rermdumri(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Academic Supporting Division. Sriracha Fisheries Research Station) Prathak Tabthipwon(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Aquaculture) Uthairat Na-Nakorn(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Aquaculture) Suriyan Tunkijjanukij(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Marine Science)

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First stage veliger larvae of senatorial scallops (Mimachlamys senatoria) with an average initial shell length of 102+-2.35 micro g and an average initial shell height of 80.8+-1.80 micro g were stocked in 10 l cylindrical plastic jars with 5 different salinity levels at 30 25 20 15 and 10 ppt, respectively. Larvae of scallops were nursed at a density of 3 larvae/ml and fed with phytoplankton. The growth and survival rate of larvae were studied until the settle stage. The results showed that growth and survival rate of larvae in different salinity levels were significantly different (p LT 0.05). Larvae of scallops nursed at 30 ppt had better growth and survival rate than other salinity levels. At 25 and 20 ppt larvae had slow growth and mortality increased. And decreased salinity at 15 and 10 ppt showed that most larvae were died and could not survived.