Bioeconomic analysis of cage culture of tilapia in Sampaloc Lake, San Pablo City, Laguna [Philippines]
1987
Tan, R.L.
The explanatory variables found to have significant impacts on yield were number of pieces of tilapia harvested per kilogram, number of times of harvesting, fingerling size at stocking, depth of lake area occupied by cage structure, stocking density, mortality during stocking and total area of cages within 50 meter periphery. Supplemental feeds interacts with pieces per kilogram and total area of cages within the peripheries and becomes significant when the former was omitted and the latter included in the model. It is concluded that it is better to grow tilapia in the northeastern and/or northwestern parts of the lake particularly at the shallower portions regardless of the distance from shore given the existing ecological conditions. Overcrowding as measured through the number of cages within the immediate neighborhood was in general not a major factor affecting yield, primarily because of supplemental feeding. However, when no feeding is done, an overcrowding effect does register. For the income analysis, the value of the financial feasibility indicators are strong manifestations that the industry is a lucrative investment opportunity. With an internal rate of return of 61%, a short payback period of 1.3 years and an earning capacity of one peso and forty centavos for every peso investment, this would explain why operators or new investors continue to enter in this business venture.
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