The South-west waters area of Aceh Province features extensive topography and encompasses a vast sea. The waters area was included in the Republic of Indonesia State Fisheries Management Area (WPPNRI) 572, which directly neighbors the Indian Ocean. The area was contained in marine biodiversity, including tuna species. However, in marine areas in the world, marine resources are currently facing environmental threats, including illegal fishing, coral reef degradation, pollution, and climate change. The research aimed to assess and analyze the frequency distribution of size and sustainability of yellowfin tuna (Thunnus albacares) in WPPNRI 572 which landed on PPI Ujong Baroh.  Descriptive and quantitative approaches were used in the current study to collect and analyze data on the length frequency, and sustainability of yellowfin tuna. It was determined that the catch of yellowfin tuna landed at PPI Ujong Baroh with a frequency of fork with a length that ranged between 44- 95.2cm. In the rapid appraisal fisheries analysis (Rapfish), the institutional dimension scored 76.02, classifying it as sustainably good (score 76- 100), while the results of the economic dimension analysis scored 72.67, fell into the quite sustainable category (score 51- 75).