The results of researching and evaluating the efficiency of production transition models from rice culture to shrimp farming in Ca Mau province shows that almost transition models provide higher economics efficiency. The benefit of extensive shrimp farming model is double compared to that of rice farming on the same location, meanwhile this figure of semi-intensive shrimp farming models and intensive shrimp farming models are 3.35 times and 14.18 times respectively. Extensive shrimp farming models provide highest economic efficiency as in these models farmers invested only 1 VND and can gain 14.08 VND of benefit
this rate is quite high, counted for 8.5 times higher than that of semi-intensive shrimp farming models and 10.6 times higher compared to intensive shrimp farming models (this rate in semi-intensive shrimp farming models and intensive shrimp farming models are 1.75 VND and 1.4 VND respectively). However, in term of investment scaling, intensive shrimp farming models provide highest benefit as its benefit is 91.72 millions VND/ha, this number is counted for 4.2 times higher than the benefit of semi-intensive shrimp farming models and higher (counted for 6.5 times) than benefit of extensive shrimp farming model. This figure is consider to be appropriate with status of shrimp farming models in reality
for extensive shrimp farming models, money for buying seed take a large proportion of invested finance in the model so the investment efficiency per 1 VND invested will be higher. However, in term of investment scaling, the shrimp farming model, in which the investment level is high, will provide higher production as well as benefit.