PENDUGAAN POTENSI LESTARI IKAN LAYANG BIRU (Decapterus macarellus) DI PERAIRAN SEBELAH BARAT SUMATERA UTARA

Abstract

Uncontrolled, continuous fishing activities and the absence of recruitment processes are indicated to lead to the degradation of fish species. A significant portion of the mackerel scad stock currently relies on natural resources, resulting in unstable fish stocks and abundance when captured without proper management. This research aims to calculate the Catch Per Unit Effort (CPUE), and evaluate the Maximum Sustainable Yield (MSY), and Total Allowable Catch (TAC/JTB) of mackerel scad. The study was conducted at the Sibolga Fishing Port with data collection carried out through surveys and utilizing the surplus production method of the Schaefer model. The findings indicated that the CPUE value in 2018 was 0,639 tons per trip, which increased to 0,764 tons per trip in 2019, then decreased to 0,527 tons per trip in 2020, and further reduced to 0,506 tons per trip in 2021. However, in 2022 it increased, back to 0,639 tons per trip again. Purse seine gear emerged as the most influential fishing method for mackerel scad resources, experiencing fluctuations in effort levels every year. In the meantime, the C_MSY value from the Schaefer model was 8,699.7, leading to the conclusion that the fishing status is already fully exploited. Meanwhile, the F_MSY value was  5,447 trips, indicating an overfishing situation since the annual catch effort has exceeded the F_MSY value. The allowable catch limit (TAC/JTB) was set at 6,959.7 tons.