The Analysis of Pelagic Fishing Areas during Paddy Tropical Cyclone Conditions
PL Sabrina

Meteorology Study Program, State College of Meteorology Climatology and Geophysics, South Tangerang, Indonesia

Abstract

The phenomenon of tropical cyclone formation often occurs in water areas with low latitudes, including the Indian Ocean and Pacific Ocean regions. Tropical cyclones around the Indian and Pacific Oceans will affect the dynamics of Indonesian waters. The tropical cyclone phenomenon will affect wind conditions, rainfall, waves, sea surface temperature, and the distribution of chlorophyll in these waters. During tropical cyclone conditions, the magnitude of the wind speed will increase from normal conditions. This condition will affect the movement of water masses in a body of water. When a tropical cyclone occurs, the distribution of temperature and chlorophyll will change with the mixing of water masses from the inside to the surface or the mixing of water masses from one water area to another. Changes in temperature distribution and availability of chlorophyll will affect the distribution of fish, including pelagic fish. Pelagic fish is one of the main fish commodities caught in the waters. Commodities of large pelagic fish in Indonesian waters are in great demand by the public, such as tuna, cakalang, and cob. This study will review wind parameters and surface pressure from Copernicus data to show the tropical cyclone conditions that affect water dynamics. Analysis of pelagic fishing grounds during tropical cyclone Paddy was carried out using data on sea surface temperature and chlorophyll concentrations originating from Aqua MODIS level 2. Tropical cyclone Paddy occurred on 17 until 25 November 2021 in the Indian Ocean. The wind speed increased significantly on November 18 up 22 with a wind speed magnitude of 11 until 15 meter per second. Changes in wind speed will affect the distribution of temperature and chlorophyll in water. The optimum temperature for developing pelagic fish ranges from 28 up 32 Celsius degree with chlorophyll concentrations of 0.3 up 2.0 mg per meter cubic.

Keywords: Tropical cyclone, temperature, chlorophyll, pelagic fish

Topic: Marine and Fisheries Geographic Information System