AN ANALYSIS OF TECHNICAL FACTORS AND FINANCIAL EFFICIENCY OF INTEGRATED IMPROVED EXTENSIVE SHRIMP FARMING SYSTEMS IN CA MAU PROVINCE, VIETNAM

The study was conducted from May to September 2020 to evaluate technical factors and the financial efficiency of integrated shrimp farming models. Forty-five inte grated rice-shrimp rotation farming and fortyfive integrated mangrove-shrimp farming households in Ca Mau were subjects of the survey. The results show that farm sizes were relatively large (2.47-5.30 ha). Stocking density was 4.70 ind./m2 (shrimp-rice) and 17.8ind./m2 (mangrove-shrimp), reaching the productivity of 229.3 and 267.8 kg/ha/crop, respectively. Besides, the rice-shrimp model harvested 1.36 tons/ha/crop of rice and 11.8kg/ha/crop of crab. The mangrove-shrimp model could harvest 69.3kg/ha/crop of crab, 79.3 kg of wild shrimp and 73.5 kg of wild fish. The total production cost for the rice-shrimp model was 6.80 million VND/ha/crop, producing a profit of 33.4 million VND/ha/crop. The mangrove-shrimp model required a production cost at 19.9 million VND/ha/crop and brought a profit of 60.1 million VND/ha/crop. The productivity of shrimp was influenced negatively by stocking density, positivelyby cultured area (rice-shrimp model), and the ratio of forest area (for mangrove-shrimp model).