The study was conducted from June to December 2021 to assess the technical – financial aspect and the existing advantages and difficulties of the giant freshwater prawn culture in coconut garden ditch culture by interviewing 32 farming households in Thanh Phu district, Ben Tre Province. The study results showed that the average area for each ditch was 0.38 ± 0.29 ha, with density stocking 4.15 ± 1.21 PL/m2. For prawns were harvested after over 8 months, the prawn yield was 421.08 ± 172.21 ton/ha/crop, the profit was 34.02 ± 14.02  million VND/ha/crop and the benefit ratio was 1.33 ± 0.56 times. The yield and the profits were affected by density stocking and nursing survival rate. Besides the advantages of labor resources, natural conditions, and  ease and less risk of giant freshwater prawn culture; however, the system currently faces many difficulties, such as lower nursing survival rate, unguaranteed quality, and quantity of postlarvae, salinity intrusion, unstableproduct market. Therefore, in order to contribute to sustainable aquaculture development, the necessary solutions include (1) providing high quality and quantity of postlarvae; (2) using settling ponds to have active water; (3) building and improving infrastructure, and irrigation systems to prevent salinity intrusion; and (4) finding the product market.

This study was conducted to evaluate the current status of the intensive white-leg shrimp farming in earthen system and tarpaulin pond system in Tra Vinh Province by interviewing 110 farmers in Trà Vinh from May to December of 2019. The results of the study showed that an average stocking density in earthen systemand tarpaulin pond system were at 195 and 87 inds/m2 and the number of crops for earthen and tarpaulin ponds are respectively from 1 - 2 crops and 2 - 3 crops per year. The harvested shrimp size and the productivity in tarpaulin ponds (35 inds /kg; 48 tons/ha/crop) were significantly higher than those in the in earthen ponds (58 inds /kg; 12 tons/ha/crop). The net income obtained from the tarpaulin ponds model (1.760 millionVND/ha/crop) was significantly higher than that in the earthen ponds (267 million VND/ha/crop). Food change ratio in tarpaulin ponds was higher than in earthen ponds. The advantages and disadvantages of white - leg shrimp farmers in two models are also mentioned in this report.

This study was conducted through the direct interview of 90 households applying the alternative system of culturing frogs in Tra Vinh Province from 9/2020 to 3/2020. The study aimed to determine current status of frog farming. The collected data includes the technical and financial aspect of culturing frogs. The results showedthat there are two models of frog farming: culturing frogs in canvas (65.56% of households), and culturing frogs in cages (34.44% of households); Both models applied the same average farming area of 36.27 m2 with stocking density of 115 inds/m2. After 2.6 months of culturing, the average frog size was 257 g. The average frogyield produced 21,024 kg/1,000 m2/crop and the net income of 100 million VND/1,000 m2/crop was achieved. The result indicated that it is easy to raise frogs because the households can take advantage of the surrounding area of their houses for raising frogs and therefore the farmers’ could improve by this method.

This study was conducted through the interview of 48 households applying alternative system of the giant freshwater prawn and shrimp farming in Tra Vinh province. The study aimed to evaluate the effects of different factors on the efficiency of the prawn farming in order to contribute to sustainable development ofthe faming system in the brackish water area of the Mekong Delta. The results showed that the pond was in average area of 0.8 ha; water salinity varied in range of 1-10 ppt during prawn farming. Prawn stocking density was 9.0 inds./m2, and all of the prawn were fed with pellet feed or combined with by-products andtrash fish. After 5, 6 months of culture, average prawn yield of 886 kg/ha/crop and net income of 68 millions VND/ha/crop were achieved. Prawn farming covered only 28.5% of total production cost of the whole system including prawn and tiger shrimp but contributed up to 44.1% of total net income of the prawn -tiger shrimp system.  A total of 89.6% of prawn farming households succeeded in getting net income, compared to 81.3% for tiger shrimp farming households. Inaddition, the study also found that factors such as water salinity, pond preparation, seed nursing and feeding methods strongly affect to the efficiency of prawn farming. The result indicated the great potential and feasibility for farming giant freshwater alternatively with tiger shrimp in brackish water areas of the Mekong delta.