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Abstract
Tuna hand line-trolling line (HL-TR) fisheries have an essential role in Indonesia’s tuna fisheries, including Indonesia Fisheries Management Areas (I-FMAs) 572 and 573. The catch of tuna line in I-FMA 572 and 573 reached ~30.4% of the total catch 189,022 tonnes in 2019. Limited data and scientific advice for developing adequate management remain a challenge for tuna HL-TR fisheries in I-FMA 573 waters. Center for Fisheries Research (CFR) has conducted an assessment using the PSA method to obtain information of vulnerability level both of target and bycatch species on tuna HL-TR in 2020. Data used in the analysis were grouped into operational fishing, productivity, and susceptibility data. The operational fishing data were obtained from Sadeng Fishing Port in2019. The productivity and susceptibility data were obtained from literature review and expert consultation through a Focus Group Discussion (FGD) and expert consultative workshop. The result showed that both target and by-catch species included in the analysis have low to moderate vulnerability level scores. The results of this research are used to help managers at a national level to determine necessary management measures with high precautionary. While for by-catch species, in particular white tip sharks, its management measures must comply with agreed IOTC regulations.
Highlights
Tuna fisheries in Indonesia Fishing Management Areas (I-FMA) 572 and 573 consists of longline tuna (LL), purse seine (PS), drifting gillnet (d-GN), and lines fisheries.Thelines fisheries here mainlyrefer to several tuna fishing gears, including hand line (HL), trolling line (TR), kite line (KL), and vertical line fishery[1]
The data and information used in this paper are part of the data collected in research on smallscale fisheries of tuna associated with fish aggregating devices in the I-FMA 573 southern of Java’ which was conducted and funded by the Center for Fisheries Research (CFR) in 2020
Fishers of tuna hand line based at Sadeng fishing port use multi-gear boats referred to as HLTR boats
Summary
Tuna fisheries in Indonesia Fishing Management Areas (I-FMA) 572 and 573 consists of longline tuna (LL), purse seine (PS), drifting gillnet (d-GN), and lines fisheries.Thelines fisheries here mainlyrefer to several tuna fishing gears, including hand line (HL), trolling line (TR), kite line (KL), and vertical line (vL) fishery[1]. Lines fisheries are hereafter called HLTR tuna fisheries, and the boat operates the HL-TR gear, called HL-TR boat. A HLTR boat operates several gears in every fishing trip, including HL, TR, KL, and vL gear. Results observation in I-FMA 573 in 2019 [1] identified that the HL-TR tuna fishery has two characters which are outstanding issues were: (1) high diversity of fish species of catch including target and by-catch, (2) limited data and information available. The high diversity of fish species has shown on the HR-TR boats based in Cilacap fishing port which landed at least 28 species of catch, both tuna as a target and by-catch, included in the ecologically related species (ERS) such as sharks and rays [8]. The marine fish genera and species per genera peak around the equator (tropical waters) and decline towards the poles [9]
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