STUDY ON F4DD AND SUBSTRATEOF SIlNONOVACULA CDNSTRICTA (LAMARCK) SPAT

1.The spats of SraonoaaczaLr eorastrici;rc (Ls,mare)i) were fed with the mimedacultures coidrccf aLum tracosterrna,aetpceros Cadc trasas, zcaterjirrggensis and aeoesos erZcztrcas, to obtian the epicted results. The spats notonly attaizz fast growth in increasing shell length duly but also has a high survivlrats at 2.In adclitior to the screexzing of Food culture, a,ttentioxs should also be paid tothe density of fvpt. According to the experiments, daily food dexsity sheuld be keptat 25-50 thousand individual per milliliter at the first four days, and abut 100 tou-.sand individuals per riuiIliliter during thefifth to eighth da,y_ The density can Beensinereused to 200 thousand individuals par mIliliter after tha ninth dayr of oulturin.g. 3.In the artificial culturing of uaorsecc eoastrctcc, fine sand or silt wtend substrata should. be prided tvharz the metamorphosis of larvae into spts taaplace In order to obtain high survival rate of the spats, the proportion of mud shouldke ixa.creased with. the Velapmcaa.t arzd growth of the spats, (in the stage of bifora,sand: mud=5:4).