The application of polyculture cultivation techniques is expected to increase the carrying capacity of farmland in certain circumstances, where production growth will remain stable. In this study, to be cultivated with a polyculture system are bandeng (C. chanos), shrimp vaname (L. vannamei), and seaweed G. verucossa. The increase in productivity of ponds (optimization) can be seen by the increase in fish production related to solid spread in cultivation media. The priority of this study is to examine the difference in density of bandeng, shrimp and  seaweed in the polyculture system. The design in this study is to use complete randomized design (RAL) with 3 treatments, each treatment has 3 replays so there are 9 experimental units. The variables observed are absolute weight and Specific Growth Rate (SGR). The results of this study show that the determination of the composition of different organisms in the polyculture system gives a real influence on absolute weight and SGR with the best treatment for absolute weight is treatment A (density of shrimp and bandeng 10 tails/m2, 250 g/m2 seaweed) is 40.73 g, and the best treatment for SGR is treatment A (shrimp density and bandeng 10 tails/m2, seaweed 250 g/m2) of 1.15 %BB/Day.

Saline tilapia (Oreochromis aureus x niloticus) is a superior strain that was released by the Indonesian Ministry of Marine Affairs and Fisheries in 2012. The advantages of saline tilapia are tolerance to high environmental temperatures and high immunity against disease attacks. The feed has an important role in the growth of tilapia and requires 60-70% of the production cost. However, the high price of feed can increase production costs and require cultivators to be more careful and have a good strategy in cultivation. One of the efforts to reduce the cost of feed is the application of probiotics with the right dose. The method used in this study is an experimental method using a completely randomized design (CRD) consisting of 3 treatments and 1 control which was classified into; treatment K (without probiotics), Treatment A (5 ml/kg of feed), Treatment B (10 ml/kg of feed), Treatment C (15 ml/kg of feed). The research was carried out for 28 days, with the conclusion that the best results were obtained by treatment A (5 ml/kg of feed) with an absolute length of 3.28 cm, an absolute weight of 5.87 grams, SGR 0.21% /day, and SR 90%.