Abstract
The aim of this experiment was to find out the suitable stocking density of sea weed as shelter to growth and survival rate of swimming crabs ( Portunus pelagicus ) reared in brackishwater ponds. The research was conducted in nine brackishwater ponds with the dimension of 250 m 2 for 120 days. The treatments different stocking density of sea weed ( Gracillaria sp.) as shelter were applied, namely A: 500 kg/ha, B: 750 kg/ha, and C: 1000 kg/ha, with three replicates, respectively. Crablet 9 th with carapace width 5,2 + 0.2 mm and body weight 0.04 + 0.02 g were introduced into each experimental ponds with density of 3 individu/m 2 . The crabs were fed with trash fish 15% of body weight in the first month, and then decreased to 5% in following month, twice a day. The experiments were design as complately randomized design. The result showed that the shelter were significantly increased to the survival rate and yield of swimming crabs (P<0.05), but not to the growth of charapace width and body weight. The best of survival rate and yield was obtained on the density of shelter at sum 1000 kg/ha.
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