Stock assessment to support sustainable management of Mackerel scad in Pasarwajo Bay, Buton Regency, Southeast Sulawesi

This study aimed to assess the stock of Mackerel scad (Decapterus macarellus) in the deep-sea ecosystem of Pasarwajo Bay, Buton Regency. Mackerel scad is an important species in the fishing industry, and in-depth understanding of their population stock in this region is essential for sustainable management. The research was conducted by collecting data from field surveys that included direct observation, fish sampling, and data analysis from fishing. In addition, historical data on the Mackerel scad fishery was also analyzed to understand trends over time. The results showed that the greatest opportunity for fishermen to be able to produce a catch of Mackerel scad was at a total length size ranging from 21 cm to 23 cm. The greatest ability of Mackerel scad to spawn was at a length of 21 cm. The total mortality rate of Mackerel scad was 11.74. The population structure of Mackerel scads appears to have more survivors than total mortality. The occurrence of peak fishing mortality at this size indicates that the utilization of Mackerel scad is still relatively sustainable because of the presence of mackerel scad that are still found in all size classes (infants, juveniles and adults). These findings provide a strong basis for the management of Mackerel scad fishery resources to maintain population viability and increase catches. The results are expected to be used to aid sustainable decision-making and maintain the deep-sea ecosystem in the Pasarwajo Bay, Buton Regency.