The coral reef health at surrounding blue swimming crab fishery sites in Mandangin Island, East Java, Indonesia

Abstract

Blue swimming crab fishery activities very often do not put into account the environmental condition. Coral reef, as one of the blue swimming crab habitats, can be affected by these activities. This study aims to determine the effect of blue swimming crab fisheries on coral health in Mandangin Island, East Java, Indonesia. Data collection points are determined based on the results of interviews by participatory mapping. Water quality data includes visibility, temperature, salinity, pH, DO, current velocity. Collecting coral reef data were using Line Intercept Transect (LIT), while for reef fish Underwater Visual Census (UVC) were used. The coral health index was determined based on the relevance between benthic components and fish components. The average of Mandangin Island’s water quality is in accordance with the quality standards of the Indonesian Minister of Environment Decree No.51 of 2004. Hard coral cover and fish biomass are classified as low, but the value of resilience is high. The coral reef health index value on Mandangin Island is 3.

The Conditions of Coral Reef Ecosystem on Seureudong Island, South Aceh

“…The presence of DCs in low coral reef ecosystems is thought to be a habitat that can support the diversity of another benthic biota. This is in line with the statement that dead coral reefs have the potential to become habitats for various decapods (Madduppa et al 2019) and even become one of the crab habitats (Ardiansah et al 2021). Another base substrate that has an almost equal percentage at each station is DCA, with the highest value at station 1, while stations 2 and 3 have almost the same percentage (34.3% and 34.0%, respectively).…”

Temporal study of coral reef health in Kepulauan Seribu Marine National Park

“…Coral reefs ecosystems have high biodiversity and productivity [3][4][5]. Coral reef ecosystem have an ecological function as spawning ground, feeding ground, and habitat for their associated biota [6]. Relationship between coral reef and their associated biota must continue to run dynamically so that the marine environment becomes healthy and primary productivity is maintained.…”