원양 다랑어연승어업에 이용되는 미끼 자원의 지속가능성 평가: 인도네시아산 풀가라지(Decapterus macarellus) 사례

Abstract

The mackerel scad Decapterus macarellus is a commercially important species in Indonesian fisheries and a major baitfish in the Korean tuna longline fishery. The increasing demand for sustainable fisheries has highlighted the need to assess bait resources and target species. However, stock assessment of D. macarellus is constrained by data limitations. FAO provides long-term catch data since 1950, but scads are reported only as “scads nei”, obscuring speciesspecific trends. Although species-level data from the Ministry of Marine Affairs and Fisheries (MMAF) in Indonesia existed from 2019 onward, the short time series limits long-term assessment. To address these limitations, we reconstructed the annual catches of D. macarellus from 1950–2018 by applying the proportion of D. macarellus within scads nei (2019–2023) to the FAO time series. The reconstructed dataset was analyzed using the catch-maximum sustainable yield (CMSY) method implemented in the CMSY++ packages to generate preliminary productivity and biomass estimates. Based on the CMSY results, the MSY for D. macarellus was estimated to be 48,200 tonnes (95% CI: 36,800–61,900 tonnes). This study aimed to establish the groundwork for bait stock assessment using the CMSY method to support MSC certification and ensure the sustainability of Korean distant water fisheries.