Bubara Fish (Local Name) or Kwee Fish (National Name) is a local economic fish from the Carangidae Family which is very popular in Maluku. Almost all restaurants and restaurants in Ambon City always serve this fish. Starting in 2007, the activity of rearing trevally fish in floating net cages has been carried out in floating net cages belonging to the Ambon Sea Cultivation Fisheries Center until now. This technology model for rearing fish in floating net cages has apparently been able to encourage farmers in Ambon Bay and West Seram Regency as well as several other districts in Maluku Province and even other provinces to develop the cultivation of trevally in floating net cages and increase their income. Fish growout in aquaculture activities aims to produce consumption-sized fish. In rearing activities, fish are encouraged to grow optimally until they reach marketable size by providing an optimal fish living media environment, and providing the right amount, quality, method and time of feed as well as controlling pests and diseases. Apart from individual growth, in rearing it is important to reduce the death rate of fish in production containers. So that fish production biomass can be achieved as high as possible. This activity aims to increase the production of trevally in floating net cages using several cultivation approaches and will take place from May - October 2020. The results of the activity show that the growth rate of trevally ranges between 2.88 - 3.23%, the survival rate ranges from 70-82% and FCR ranges from 3.01 – 3.22. The results of the business analysis obtained a B/C ratio = 1.78, Payback Period = 0.8 years and ROI 77.81%. In general, this fish rearing activity is worth doing because it provides benefits during the rearing period. Apart from that, to reduce the seed mortality rate, what must be considered is the adaptability of the seeds, transportation, changing nets and handling when sampling seeds.