Abstract
There are two essential landing sites for handline tuna in Indonesia: Palabuhanratu (in the Indian Ocean) and Kendari (in the Banda Sea). This paper analyzes handline catches from the Indian Ocean and Banda Sea waters as the main fishing ground. The catch composition of the handline tuna landed in Kendari is more varied than Palabuhanratu. Several species commonly caught are yellowfin tuna (Thunnus albacares), skipjack tuna (Katsuwonus pelamis), bigeye tuna (Thunnus obesus) as a target species, and some billfish species as bycatch. Mean CPUE for handline tuna landed in Palabuhanratu is lower than Kendari. A significant difference is based on the monthly mean CPUE variation between Palabuhanratu and Kendari landing sites (p < 0.001). Handline catches in Palabuhanratu had a more comprehensive range of length sizes than Kendari, using a two-sample K-S test showed significant differences (p < 0.001). The fish size landed in Kendari is relatively smaller than Palabuhanratu. The average length of fish caught by handline is smaller than the length at first maturity (Lm) value in both landing sites. The use of large size hook for hand lines is recommended for catching tunas in this area.
Highlights
Tuna and tuna-like species are utilized by industrial and small-scale fisheries in Indonesia using several fishing gears such as longline, purse seine, handline, pole and line, gillnet, and troll line [1]
This paper aims to analyze and compare the catch of handline tuna in these two areas, especially for catch composition, catch per unit effort (CPUE), and size of fish
The result of the two-sample K-S test showed there was a significant difference for the three target species (D yellowfin tuna (YFT) = 0.66137, D bigeye tuna (BET)= 0.31539, D skipjack tuna (SKJ) = 0.65198, p < 0.001)
Summary
Tuna and tuna-like species are utilized by industrial and small-scale fisheries in Indonesia using several fishing gears such as longline, purse seine, handline, pole and line, gillnet, and troll line [1]. Tuna fishing activities by industrial-scale have been going on since the 1960s1970s, along with the introduction of longline and purse seine [2]. The production of tuna fish resources in Indonesia in 2018 reached 670,000 tons, divided into tuna fisheries production in the Indian Ocean of 150.00 tons. The handline tuna fishery in Indonesia has been developing for a long time and was only published in the 1990s [5]. Handline fisheries in Indonesia fall into small-scale fisheries with vessel sizes < 10 GT [6]. Tuna handline fisheries provide opportunities for economic sustainability through product certification and export markets [7], biological and social [8]
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