The Effects of Water Level Pressure on Protease Enzym Activity that Promote Growth Performence and Survival Rate of Pinctada Maxima Larvae

The growth of pearl shell oyster is influenced by availability of nacre that consist of calcium carbonate. Nacre is identified as a protein metabolism product in pearl oyster. The purpose of this study was to evaluate the effects of media level pressure in larva rearing tank on protease enzyme activity to promote growth performance and survival rate of Pinctada maxima larvae. The research was conducted from March 6th to May 7th 2015 in laboratorium of Mataram Marine Bio Industry Technical Implementation Unit, LIPI. “Chi-Square” test showed that survival rate of larvae at Umbo-veliger stage (planktonic) was significantly affected by water level pressure influence within 99 persen with ratio 1,00:1,61. In contrast, water level no pressure was significantly affection survival rate of larvae in spat stage influence within 99 persen confidence with ratio of 1,00:1,93. The highest average survival rate of larvae in umbo-veliger and spat stages were 13.10 and 2.60 persen, respectively. The effect of protease enzyme activity on calcium carbonate production to produce oyster shell are also discussed in this paper. Jurnal Ilmu dan Teknologi Kelautan Tropis, Vol. 7, No. 2. Hal. 655-669