The shark by-catch of tuna longline fisheries in Southern Indian Ocean of Java, Indonesia

Priyo Suharsono Sulaiman,Rauf Achmad Sue,Mufti Petala Patria,H Herdiansyah

doi:10.1051/e3sconf/20187402004

Priyo Suharsono Sulaiman, Rauf Achmad Sue + Show 2 more

Open Access

https://doi.org/10.1051/e3sconf/20187402004

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Abstract

In relation to the achievement of the target SDG’s No. 14, the sustainable shark fisheries management need to implement. As a part of the tuna fisheries by-catch, a high number of shark resources have been caught in the Indian Ocean waters. One of the main vessels of tuna catchers in the Southern Indian Ocean of Java is the tuna longline from Cilacap. This paper aims to analyze the shark by-catch of tuna longline in the Indian Ocean in the south Java that landed in Cilacap. The research data was obtained from daily recording activities of fishing vessel loading activities by Cilacap Ocean Fisheries Port staff during the period of 2013-2017. The analysis was done through data tabulation, graphical approaches, and data trend analysis through the availability of time series data. The data analyzed include fleet development, fishing ground, catch composition and CPUE value. The results of the analysis show that there are about eight species of sharks that are by-catch of tuna longline from Cilacap. The highest shark by-catch occurred in April with CPUE averaging 9 kg/day/vessel. The blue shark (Prionace glauca) is the dominant shark catch which reaches 66% of the total sharks catch.

Highlights

Cilacap Ocean Fisheries Port (OFP) is the largest fishing port on the south coast of Java Island
A total of 188 tuna longline fishing vessel were recorded based on this port with a total catch of various species of fish reaching 3,178.75 tons in 2016 [1]
Many shark resources are captured as by-catch using tuna longline fishing gear, drifting gill nets, bottom set gill nets, and become the target by shark longline

Summary

Introduction

Cilacap Ocean Fisheries Port (OFP) is the largest fishing port on the south coast of Java Island. Based on Cilacap OFP fisheries statistics, tuna longline is one of the dominant fishing gears used to catch tuna in the Indian Ocean. A total of 188 tuna longline fishing vessel were recorded based on this port with a total catch of various species of fish reaching 3,178.75 tons in 2016 [1]. In each activity of catching tuna as a target, other marine biotas are caught namely by-catch. As part of tuna fishing by-catch, sharks are one of the main predators in the food chain in marine waters. In Indonesia, most shark fishery products are by-products (72%), and 28% are produced as a result of major catches [3]

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