This study aimed to determine the biomass culture capacity and total carotenoid content of heterotrophic marine microalgae genera, including the genus Schizochytrium and Thraustochytrium on the coast of Tra VinhProvince. Five strains of these genera, DH41.79, CN27, DH10, CN15, and CN47, were cultured for biomass and carotenoid content. The study showed that the cell density of CN47 was highest with different periods under three different dilution levels (10%, 20%, and 30%), with a positive relationship between cell density and dryweight of algae strains (R2 ≈ 1 > 0). Besides, the results indicated that all densities of strain CN47 showed carotenoid content of this strain (7,613 µg/kg) was significantly higher than that of the 04 remainings and previous studies. The research results contribute to the foundation for scientific works on the heterotrophic marine microalgae Thraustochytrids, which have a high potential for applications in biomass production,extraction of high-value nutritional compounds for aquaculture, towards sustainable development through replacing fish oil sourced from natural exploitation in Tra Vinh Province.
The paper discusses about the importance of soft skills to some students activities such as finding jobs, starting a business; the necessity as well as the challenges of integrating soft skills into teaching specialized knowledge at universities and colleges. In addition, the author proposes some solutions to improve the effectiveness of the application of training models, contributing to raising students’ awareness of the importance of learning soft skills - the key to success in the future.
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.
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