Potency and Spatial Distribution of Trochus sp. In Intertidal Zone of Rhun Island Waters, Banda Sub-District, Central Maluku Regency

Abstract

Trochussp belongs to class gastropods in order Archaeo gastropoda. Most of this mollusks live in intertidal zone of coastal waters area. Utilization on fishery resource by inappropriate-based information toward this potential resource will cause population structure changes inflicting extinction. This study aims to know the size, density, potency, diversity index, homogeneity index, dominance index and distribution pattern of Trochus sp. Research site is located in intertidal zones which are divided into three zones (high, middle and low) in an area width of 111.000 m², while the observed area is 20.875 m² (18.81%). Applied method is transect quadrant in size of 5x5 m with 25 m of transect distance which is perpendicular to the shoreline and this quadrant is set based on the line transect with no distance. The findings show that dominant species in high and mid intertidal zones is T. Pyramis, while the dominant species in low zone is T.niloticus. Average size of Trochus sp. basal diameter increases in a deeper waters; this is in contrast to the density. Trochus sp. potency in high zone is 46 ind.ha^-1, 28 ind ha^-1 in the mid zone and 25 ind.ha^-1 in the low zone. Diversity index value of Trochus sp.is moderate, low. Obtained distribution pattern of Trochus sp. in research sites from the three zones are clumped pattern based on habitat and food.