The peanut-wonn Sipunculus nudus Unnaeus, 1767 is a highly nutritious and economical viable species, it is common found in Khanh Hoa and Quang Ninh provinces. Experimental results of two month grow-out this species in cement tanks using 3 different bottom materials (Experiment 1: Sandy bottom
experiment 2: Muddy bottom and experiment 3: bottom with Y2 sand + Y2 mud) showed: survival rate was highest (77 percent) in experiment 3 N sand + Y2 mud bottom)
it was lower (45.0 percent) in experiment 1 (sandy bottom)
and the lowest (20.0 percent) was in experiment 2 (muddy bottom)
Peanut-wonn in bottom of d sand + d mud was 5,0 cm in length and 2.10 g in weight, it was 4.5 and 4.8 cm long and 1.71. and 1.76 g weight in sandy and muddy bottom, respectively. Experiment of grow-out peanut-wonn in cement tanks with bottom of Y2 sand + Y2 mud using 3 different food (Experiment 1: Micro-algae including Isochrysis sp., Chaetoceros sp., Platymonas sp., Navicula sp., and Nitchia sp.
experiment 2: Processing food including trast fish, fishmilk, soybean, rice bran
experiment 3: including processing food as in experiment 2 plus micro-algae as in experiment 1). Results showed that, growth rate was highest (Average length was 5.0 cm) in experiment 3 (Combination of processing food and micro-algae), it was lower (Average length was 4.6 cm) in experiment 2, and the lowest was (Average length was 4.0 cm) in the experiment 1. The survival rate was highest (76.0 percent) in experiment 3, it was lower (56.0 percent) in experiment 2, and the lowest (15.0 percent) in experiment 1.