Effects of Micro-current on the Survival Rate and Growth Status of Coral Reef-building Coral Seedlings in Dapeng Bay
In order to study the survival and growth of reef-building coral seedlings under the action of micro-current,Acropora pruinosa,Porites lutea,Turbinaria peltata,Pavona decussata and Montipora turgescens in Dapeng Bay of Dapeng Peninsula of Shenzhen City were taken as the research objects.The micro-currents with voltages of 6,12 and 18 V were applied to the reef-building coral seedlings respectively,and the survival rate and growth of various reef-building coral seedlings under different voltage micro-currents were analyzed and compared.During the experiment,the pH value,dissolved oxygen and nutrients in seawater did not change much.After the action of micro-current,the coral shedding rate decreased from 3.33%-6.67%to 0.00%-5.00%.Among them,the coral shedding rate of the 6 and 12 V voltage experimental groups of Porites lutea decreased to 0.The survival rate of coral seedlings increased from 91.67%-93.33%to 93.33%-98.33%.The growth rate and growth rate of different types of reef-building corals were different in the promotion of micro-current.The growth rate of A.pruinosa was the highest,and the growth rate of P.decussata was the lowest.When the voltage was 12 V,the micro-current had the best effect on the survival status and growth rate of A.pruinosa,P.lutea,T.peltata,P.decussata and M.turgescens.Micro-current reduces the shedding rate during the cultivation of reef-building coral seedlings by promoting the extension of reef-building coral tissues,and improves the survival rate and growth rate of reef-building coral seedlings.
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