Catching investigation of yellowfin tuna (Thunnus Albacares) based on the distribution of chlorophyll-a in the North Waters of Aceh: A November and December analysis

Muhammad Irham,Afdhal Fuadi,Maulana Wali Akbar,Muhammad Authar,Mukhlis Mukhli,Ichsan Setiawan

doi:10.1051/e3sconf/202233902004

Abstract

The purpose of this study was to analyze the distribution of chlorophyll-a on the catch of yellowfin tuna in the northern waters of Aceh. This research was conducted in the north of Aceh waters starting from November to December 2020. fish catch data was collected by direct survey in the field by following the activities of fishermen and recording the number of catches. Data on chlorophyll-a was obtained from Aqua Modis satellite imagery. The catch data analysis used the CPUE model, while the chlorophyll-a analysis was carried out using the SeaDas 7.5 and ArcGIS. The results showed that the catch of yellowfin tuna was higher in November than in December as well as the distribution of chlorophyll-a content. The coefficient of determination (Adjusted R Square) is 0.09, which means that the relationship between chlorophyll-a and yellowfin tuna catches is only 9%, while 91% is influenced by other factors. These results inform that the content of chlorophyll-a does not show a significant relationship to the catch of yellowfin tuna.

Highlights

Aceh is one of the largest producers of tuna commodities, especially Yellowfin Tuna (Thunnus Albacares) [1,2], because it is surrounded by the Indian Ocean and Andaman Sea [3], and has a high selling value [4,5,6]
Yellowfin tuna production data obtained during the study were used to calculate catch per unit effort (CPUE)
The decline in catch productivity in the northern waters of Sabang Island and the western waters of the Sabang Island was caused by weather factors, changing fishing areas, as well as the warning of the year-end Tsunami disaster in Aceh Province which resulted in fewer yellowfin tuna fishing trips by fishermen

Summary

Introduction

Aceh is one of the largest producers of tuna commodities, especially Yellowfin Tuna (Thunnus Albacares) [1,2], because it is surrounded by the Indian Ocean and Andaman Sea [3], and has a high selling value [4,5,6]. In 2012 yellowfin tuna production was 2,719 tons, in 2013 it was 3,656 tons and in 2016 production increased to 7,302 tons [7]. The distribution and abundance of yellowfin tuna is strongly influenced by several oceanographic parameters [8,9], one of which is chlorophyll-a [10,11]. Chlorophyll-a is one of the oceanographic biological parameters that plays an important role in primary productivity in the sea [12]. The distribution of chlorophyll-a contained in phytoplankton can be used as a measure of fertility in a water[13,14]. As a green pigment found in plants, chlorophyll-a use sunlight to carry out photosynthesis [15]

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Discussion

Conclusion