Makassar Strait plays a vital role as one of the skipjack tuna fishing grounds in Indonesia. This study aimed to detect the skipjack tuna preference of sea surface temperature (SST) and chlorophyll-a (Chl-a) in Makassar Strait and to map out the possible shifting potential fishing zone (PFZ) of skipjack tuna by simulating sea surface temperature increase. We analyzed the skipjack catch data from July to November 2020, and we added the previous data in June, July, August, October, and December 2019 in the same study area. We analyzed together with satellite imagery data set of SST and Chl-a using GAM. We used three scenarios for the SST increase model simulation, which are 0.25, 0.5, and 1℃. The results showed that skipjack tuna is relatively high in SST ranging from 28.3 to 30.4°C and Chl-a ranging from 0.18 to 0.28 mg/m3. The PFZ based on sea surface temperature simulation showed that PFZ area form in the northern part shifting to the southern part of Makassar Strait based on the increasing sea surface temperature simulation visible in September, which shifted from 0.017-5.421⁰S to 2.923-6.802⁰S and October shifted from 0.017-6.802⁰S to 5.007-6.802⁰S. Knowing the shifting of the potential fishing zone of skipjack tuna could be an important step toward fishing operation and management for skipjack tuna resource management in Makassar Strait.
The purpose of this study is to detect chlorophyll-a front by using the Single Image Edge Detection (SIED) method and analyze the influence of the closest distance of chlorophyll-a front to the skipjack tuna catches. This study was conducted from June to August 2019. Data collecting was conducted by using survey method by following fishing operations in two research areas namely Barru Regency and Pinrang Regency, South Sulawesi, which is the representation of the fishing base area of skipjack tuna fishing in Makassar Strait. We collected skipjack tuna catches data and fishing ground positions (longitude and latitude). We used chlorophyll-a imagery data which was downloaded from https://oceancolor.gsfc.nasa.gov/. The results showed that chlorophyll-a front was detected in every observation month and more detected in offshore of the southern part of Makassar Strait. Based on GAM analysis, there is a relationship of the closest chlorophyll-a front distance from the catch point where the skipjack tuna catches is relatively higher at a distance of 15 -20 km from the nearest chlorophyll-a front distance. This research is dedicated to being used as a reference for skipjack tuna resources management in Makassar Strait.
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