Adaptability comparison of venus clam(Cyclina sinensis)with different sizes to three new sediments
In order to explore new substrate materials suitable for industrial culture of venus clam(Cyclina sinen-sis)and to solve the reuse problem of traditional sediment substrate,venus clam with shell length of 1.5,2.5,and 3.5 cm was reared in a clean 32 cm×24 cm×20 cm tank at the bottom covered with 5 cm thickness of shell powder,quartz sand,glass beads and sand(as control group)at sea water depth of 15 cm at water temperature of(21±1)℃to compare the burrowing ability of different sizes of venus clam.The results showed that there were 6 steps for the clam to burrow into the sediment,including ready to stretch out of siphon,extension of foot,insertion of the foot into the bottom material,the vertical shell,burrowing and the completion of theburrowing.There were signifi-cant differences in the completion time,burrowing rate and burrowing depth among different sizes of the venus clam at the same sediment(P<0.01),with the shortest burrowing time in the venus clam with shell length of 1.5 cm in glass bead substrate(P<0.01),and without significantly different in the venus clam with shell length of 2.5 cm and 3.5 cm in glass bead substrate and shell powder(P>0.05).The three sizes of venus clam had the maximal bur-rowing rate in shell powder bottom(P<0.01),and the deepest in glass beads sidement(P<0.01),showing good adaptability to the three new sediment materials which can replace the traditional sediment,especially,the shortest and deepest burrowing in the glass bead sediment.The findings provide a theoretical basis for improving the bottom material of the industrial culture of C.sinensis and economic benefit of the culture.
万方数据
维普
