NGHIÊN CỨU SỰ ẢNH HƯỞNG CỦA MẬT ĐỘ NUÔI VỖ VÀ PHƯƠNG PHÁP ẤP TRỨNG LÊN NĂNG SUẤT SINH SẢN TÔM CÀNG SÔNG (Macrobrachium nipponense, de Haan 1849)

The oriental river prawn (Macrobrachium nipponense, de Haan 1849) is a freshwater crustacean species with high economic value and strong development potential. The success of artificial reproduction greatly depends on broodstock conditioning and the method of egg incubation. This study aims to determine the appropriate broodstock rearing density and incubation method in river prawn seed production. In this experiment, male and female prawns were reared at densities of 50, 100, and 150 individuals per square meter in tanks, using commercial feed for white-leg shrimp with a protein 40% and lipid 7%. The results showed that at a rearing density of 50 individuals/m², the survival rate (71.0%) and maturation rate (79.1%) were significantly higher ( P <0.05) compared to the densities of 100 and 150 individuals/m². During the broodstock maturation process, female prawns carrying eggs on days 9-10 were selected to test two egg incubation methods: natural incubation (eggs carried by the female) and artificial incubation (eggs removed from the female and incubated separately). After 9 days of observation at temperatures ranging from 24.5 to 26.5°C, the results showed that natural incubation achieved a higher hatching rate (80.4%) compared to artificial incubation (71.8%). However, artificial incubation offers advantages in environmental control and is more suitable for large-scale production.