Infestation of biofoulings (Balanus sp. and littoraria sp.) on mangrove rhizophora sp. and avicennia sp. at Gadingrejo, Pasuruan, Indonesia

Biofouling or epibionts are common organisms colonize and growth in surface of any subjects in the marine environment, including on mangrove trees. Balanus sp. and Littoraria sp. are broad known as epibionts that grow from lowest low water until highest high water in Rhizopora root. The aim of this research was to know the abundance and effect of biofouling (Balanus and Littoria) on two major mangroves in Pasuruan, Indonesia, Rhizophora sp. and Avicennia sp. Three stations were chosen to observe abundance of biofouling and the result showed abundance of Balanus sp in station 1, 2 and 3 were 0.7 individual/m², 0.45 individual/ m^2, and 0.47 individual/m², while abundance of Littoria sp showed lower were 0.2 individual/m², 0.33 individual/m² and 0.26 individual/m² (station 1, 2, and 3). Based on physical view in mangrove trees Balanus sp made damages in root because chemical liquid that produced to attach in root, there were phenol and phenoloxydase. In other hands Littoria sp did not make damage to mangrove.