PENGARUH PERBEDAAN JENIS MEDIA ALAMI DAN EKOSISTEM TERHADAP KEANEKARAGAMAN DAN LAJU PERTUMBUHAN JENIS MOLUSKA DI PERAIRAN PESISIR SEKOTONG

Abstract

Mollusca are one of the fouling (biofouling) organisms attaching to hard objects in the sea and freshwater waters. The attachment and growth of fouling organisms is a serious problem because it is one of the factors that can damage the structure of building materials and has a considerable impact on the development of the marine industry. This study aimed to determine the effect of distinction of natural media placed in three ecosystems towards species diversity and growth rates of mollusca. The observation of attachment conditions and growth of the mollusca populations in each media were documented by using an underwater camera. Based on the results of research and identification, the researcher found that there were 5 species from 2 classes namely Gastropoda and Bivalvia and 2 family named Vermetidae and Ostreidae. The attached species of Gastropoda class was only Petaloconchus varians, while species of Bivalvia class were Planostrea pestigris, Alectryonella plicatula, Ostrea edulis and Crassostrea gigas. The most abundant species were found in tile media with an abundance of 1,014 individuals / cm2. While the lowest abundance of individuals was found in stone media which was equal to 0.141 individuals/cm2. The species with the highest population growth rate was the species of Petaloconchus varians with a total population growth rate of 11.66 ind/ week. While species with the lowest population growth rate was found in Alectryonella plicatula species with a total population growth rate of 0.16 ind/ week.