<![CDATA[Mackerel is one of the most frequently landed fish species and is in high demand, both in local and international markets, thanks to its delicious meat and high price. Catch data shows a significant increase for mackerel, from 293,409 tons in 2019 to 488,300 tons in 2022. However, continuous mackerel fishing can have an impact on the population of this fish. Therefore, research is needed to understand the dynamics of the mackerel population, including aspects of growth, mortality, and exploitation levels. The purpose of this study was to analyze the distribution of fish length, the relationship between length and weight, growth rate, and mortality rate. The study was preceded by a field survey to determine the condition of the location and the type of fishing gear used. Sampling was carried out randomly from fishermen. The data was processed using Microsoft Excel and FISAT 2 applications for further analysis, which included the frequency distribution of length, the relationship between length and weight, and growth parameters. The variables observed included the fork length and weight of mackerel samples and the average water temperature obtained from NASA satellite imagery data. During the research in September-November 2024 located at PPI Sukadana, Kayong Utara Regency, a total of 233 mackerel fish were taken as samples. The frequency of fish length was grouped into 9 classes with a length interval of 4 cm. The length of the mackerel found ranged from 51-86 cm. The highest length class was in the range of 71-74 cm with a total of 35 fish, while the lowest class was in the range of 83-86 cm with 12 fish. Most mackerel had a length of between 59-74 cm, with a total of 101 fish. Analysis of the relationship between the length and weight of mackerel was carried out through regression, which showed that the growth pattern of mackerel was negative allometric. With the equation W = 0.0867L ²,46, it was found that the increase in fish length occurred faster than the increase in weight. Growth parameters were analyzed based on the Von Bertalanffy equation, where the asymptotic length (L∞) was found to be 85.05 cm, with a growth coefficient (K) of 0.51 per year. Mortality and exploitation analysis shows total mortality value (Z) of 1.62 per year, natural mortality (M) of 0.87 per year, and mortality due to fishing (F) of 0.74 per year, and exploitation rate (E) of 0.46 per year. This shows that exploitation in the utilization or capture of mackerel is included in the category of utilization that is still within safe limits (Balancedfishing).]]>
