The Diversity of Tolerant Fish in the Coastal Waters of Lusi Island Sidoarjo Regency

Abstract

Abstract One of the government’s effort in overcoming the Lapindo mudflow is to drain mud through the Porong River to form sediments which over time form an artificial island called Lusi Island. As a result of the mud accumulation in the waters of the Lusi Island region can reduce the waters quality and existing organisms diversity. The purpose of this research was to descibed the diversity of fish that are tolerant in the Coastal Waters of Lusi Island Sidoarjo Regency, explained the relationship between the diversity index of fish and water quality in the Coastal Waters of Lusi Island Sidoarjo Regency, explained the relative abundance index of toleran fish in the Coastal Waters of Lusi Island Sidoarjo Regency, and know the water quality in the Coastal Waters of Lusi Island Sidoarjo Regency based on the diversity of fish. This research was did in November 2019 - February 2020. The type of research was observational reseach. Accumulation of sample fish and physical chemical quality of the waters were taken at five station. Identification fish of water based on morphological charateristics. The diversity index was analyzed according to the Shannon-Wiener index. The relative abundance index was analyzed index was analyzed based on the Odum Abundance. The result revealed that there were eleven species belonging to nine family. The relation between water quality and fish diversity index showed a positive relation which the bigger value of water quality was also followed by the bigger value of fish diversity index. The highest relative abundance index is in Mystus nigriceps fish species with 50% percentage and the lowest is Ethmalosa fimbriata with 3% percentage. The value of fish diversity in the Coastal Waters of Lusi Island Sidoarjo Regency is 2.31 which included in the uncontaminated category. So, it can be concluded the relation of fish diversity index with the physical and chemical quality of the water in the territorial waters of Lusi island Sidoarjo Regency is classified as not polluted, because the value of H > 2.0 which according to Lee, Wang & Kuo is included in the uncotaminated category.