Comparison of the catch of two fishing technologies for yellowfin tuna (Thunnus albacares Bonnaterre 1788) in Bone Bay waters, South Sulawesi Indonesia

Abstract

Yellowfin tuna is one of the important pelagic fishery commodities in the Bone Bay waters, exploited using hand lines and pole and line. This study aims to compare the size structure, the number of the cohort, compositions of catch according to fish maturity stage and percentage of catch suitable size. Fish length data were collected from January to August 2020. Size structure and age groups were analyzed using the Bhattacharya method. The gonad maturity stage observed morphologically using the Schaefer and Orange method, the percentage of catch suitable size using the Mallawa method. The hand line catches measuring 39 to 111 cm, dominant size 49 to 57 cm and 66 to 73 cm, consisting of three age groups and dominated by young. The pole and line catch measuring 34 to 87 cm, dominant size 35 to 37 cm, consisting of three age groups and dominated by the young fish. The percentage of catch suitable size in both fishing technologies is low.

Mapping spatial-temporal skipjack tuna habitat as a reference for Fish Aggregating Devices (FADs) settings in Makassar Strait, Indonesia

“…The existence of skipjack tuna in FAD areas is caused by the natural behavior of fish to be attracted to floating objects (Matsumoto et al 2016); this will be constructive for catching fish in a specific area. In addition, skipjack tuna is easy to get food in the FAD area because FAD has an attractor that can be a shelter from small pelagic fish (Mallawa et al 2021). It is necessary to admit that so far, the installation of FADs in the waters without improved management and good governance will impact the assessment of FADs as unsustainable tools (Dagorn et al 2013;Leroy et al 2013).…”