The profitability of oyster and mussel farming in the Philippines was studied by Librero, et. al. (1976). The farms surveyed were small (50 m2), medium (50–500 m2) and large farms more than 500 m2.
The study showed that farms of all sizes could be profitable under certain conditions such as farm size, location of farm and method of farming. Larger farms had greater income than small farms but they require more labour input. Smaller farms usually use family labour. Farms located far from market outlets spend more for transport of their crops. Overall, the profitability of oyster farming is attractive enough. This is borne out by the fact that there are over 1 200 private oyster farms operating in the country. Profitability of oyster farming by size of farm and method of farming ranges from 10 to 73 percent depending on culture method used. A prospectus for oyster farming is in Appendix 1.
Although current prices of materials used for oyster farming has gone up, the market price of oysters also went up. In 1987 the total oyster production of the country was 10 361 MT valued at 
52.841 million (un-shelled). On the other hand, mussel production was 11 644 MT valued at 101.855 milion.
A survey of the profitability of mussel farming by stake method showed 56 percent (Librero, et. al., 1976). Other methods of culture could earn a profit ranging from 74 to 76 percent per ha per year (SCS, 1982).
A prospectus for a mussel farm is shown in Appendix 2.
