The impact of mangrove environmental conditions on the growth rate of juvenile blue swimming crab (Portunus pelagicus) in Polagan Beach, Pamekasan, Madura Island

Abstract

Mangrove forests have essential ecological functions, especially for coastal areas, one of which is as a shelter for small crab species at the juvenile stage. The research was conducted in Polagan Beach, Pamekasan Regency in November 2020-January 2021. The methods were divided into three sequential parts: pre-survey (processing of mangrove density data through Sentinel 2 satellite imagery), survey (calculating water quality and mangrove density parameters) and post-survey (determining each point/station that was used to support the continuity of the research). Data used in analysis are primary data (field) and secondary data (satellite image). The satellite image used in this research was acquired from Sentinel 2 satellite. The result concluded that temperature and salinity affect the growth rate of juvenile blue swimming crabs, but it does not occur significantly. The pH and heavy metal levels affect the survival rate of juvenile blue swimming crabs. Optimal temperature and salinity levels that can produce maximum juvenile growth are temperatures around 28-32°C and salinity around 32-34ppt. The level of mangrove density affected the water quality parameters (temperature and salinity).