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Abstract
The landcrab (Gecarcoidea lalandii) is native species having high economical and ecological value at Ly Son district, Quang Ngai province. This research aims to determine the suitable culture density diet for the landcrab, providing base for defining the potential culture this species for commercial and conservation purposes. The landcrabs were cultured at five different density of 1, 3, 5, 7 and 9 inds./m². After defining the appropriate cultured density, five different food treatments were used to culture the crab: TA1:100% vegetable; TA2: 50% vegetable + 50% cooked trash fish; TA3: pellet for shrimp (GOAL 6804, CP. Group, Thailand); TA4: 50% pellet and 50% TA1; TA5: 50% pellet and 50% TA2. Results showed that survival of the landcrab decrease when incraesing the culture density. At the cultured density of 5 and 7 inds./m² the growth rate and was higher than at the density of 1,3 and 9 inds./m². The lowest survival was observed when the landcrabs were fed 100% vegetable diet (TA1) and 100% pellet for shrimp. The diet containing 50% vegetable and 50% pellet resulted in higher survival, length, wide and growth rate comparing to other diets The current results suggest that the landcrab, Gecarcoidea lalandii, should be cultured at the density 5 -7 inds./m² and feed on the vegetable diet added a small proportion of cooked trash fish or the pellet for shrimp.