The blue economy is one of the leading sectors in Indonesia, especially fisheries. This research was conducted in three coastal cities/regencies: Semarang City, Demak Regency, and Kendal Regency, Central Java Province, Indonesia. This study examines the factors for fisheries activities topics, both aquaculture in inland water and fish capture in marine fisheries, namely: Gross Regional Domestic Product (GRDP) in each district capital in the aquaculture business, fisheries human resources, production and production value of capture fisheries, production, and production value, volume, production value of aquaculture and water quality which plays a role in increasing aquaculture yields. The secondary data are from the Central Bureau of Statistics (Badan Pusat Statistic (BPS)) and the Indonesian Ministry of Maritime Affairs and Fisheries (Kementerian Kelautan Perikanan (KKP)). The survey data used were from 2018 to 2023, with the following subjects covered it is (1) GRDP, (2) capital in aquaculture, (3) labor, (4) production of capture, (5) production of value fisheries source by data the result of fish value (Indonesian rupiah (IDR)), (6) production of aquaculture, (7) volume (kg) production of aquaculture, (8) value (IDR) production of aquaculture. The results of this study indicate that these factors are closely related to the yields of aquaculture activities. GRDP is a factor that specifically influences the outcomes of fisheries; in the analysis of the average fisheries activity in the last 5 years, Semarang City was 5.24%, Kendal Regency at 4.95%, and Demak Regency at 2.09%; furthermore, it can be concluded that fisheries activities, namely aquaculture and marine capture, have increased per year. The implications of aquaculture production results for the blue economy that stakeholders can use to implement policies are increasing economic contribution. Increased production will create new jobs, strengthen supply chains, and increase income for people involved in the fisheries industry.