Analysis of Fish Catches of Fishermen in the Southern Waters of Java Island in 2018 and 2020 Based on Chlorophyll-A Fertility and Sea Surface Temperature

Abstract

The decline in fish catches in 2018-2020 becomes a problem experienced by fishermen in the southern waters of Java island. This affects fishermen whose livelihoods are from marine products. From these problems, the purpose of the research is to analyze the fishermen's catches in the southern waters of Java island in 2018 and 2020 based on chlorophyll-a fertility and sea surface temperature (SST), and supported by upwelling phenomena and determination of Potential Fishing Zones. The method used is secondary data analysis taken from MODIS Level 3 imagery to visualize water conditions. The concentration of chlorophyll-a in the eastern season of 2018 had an average of 0.4-0.6 mg/m 3 with a sea surface temperature of 25.9-27.8 °C. In 2020, there was a decrease by an average of 0.3-0.4 mg/m 3 with a sea surface temperature of 26.7-28.3 °C. This is proved by all significance values of paired t-test less than 0.005. That is, there is a significant difference between both periods. In 2018, the widest strong upwelling was in July with an area of 13,0723.94 km 2 . In 2020, it occurred in June with an area of 41,515.86 km 2 . The most potential fishing zones of 2018 were in August as many as 254 points and in 2020 in July 154 points. High chlorophyll-a with low sea surface temperature levels, strong upwelling areas, and dominant potential fishing zones are mostly found in areas proximate to the coast compared to those further away from the coast.