The relationship between total suspended matter and sea current for the spread of Chlorophyll-a and fishing area in Jakarta Bay

Abstract

Jakarta bay is a water with high input load due to activities from the surrounding river estuaries comes from Jabodetabek regions. This activity impacts the availability of Total Suspended Matter (TSM) in Jakarta Bay. The problem comes when the concentration of TSM exceeds the carrying capacity of the water thus encouraging plankton to grow and breed rapidly which has caused eutrophication. This research has three objectives: (1) Analyzing the relationship of TSM and Chlorophyll-a Case 2 (CHL2), (2) Analyzing impacts between sea current with CHL2 distribution, and (3) Analyzing correlation CHL2 distribution with fish catch data. Data collection was conducted on January 2018 until December 2018. Monthly TSM and CHL2 data were obtained through GlobColour data, monthly data on sea currents were obtained through Marine Copernicus data. TSM and CHL2 data were processed using the GIS and time series method to determine distribution area. Furthermore, a regression analysis is used to determine the relationship of TSM and CHL2. The result: Relationship of TSM and CHL2 obtained R = 0,8508 so that there is a strong association between TSM and CHL2; the current pattern in the Jakarta bay strongly affected by monsoon wind, the highest distribution occurs in the NWM, evenly distribution occurs in the transition 1, and SEM, the lowest distribution occurs in the transition 2; the demersal and pelagic fish catch period occurs in the end of transition 2 period where high CHL2 concentration and low sea current velocity make it easier for fishermen to catch the fish.