Abstract
Different feeding rates were applied to determine the growth rate and biomass increase of juvenile black apple snail, Pila polita, in rearing stage. The experiment included 4 feeding treatments as follows: 1). Feeding 3% of snail biomass (SB) in 5 weeks of experiment (F3-3); 2). Feeding 3% SB in week 1 and increasing to 5% from week 2 onward (F3-5); 3). Feeding similar to treatment 2 in first two weeks and increasing to 7% from week 3 onward (F3-7) and 4). Feeding similar to treatment 3 in first 3 weeks and increasing to 10% from week 4 onward (F3-10). Juvenile snails (initial weight at 0.10 - 0.13 g and shell height from 7.05 - 8.03 mm) were reared in PVC tanks (40 × 80 cm) at the stocking density of 300 ind./m2 and fed with commercial pellet (18% protein). After 5 weeks, the survival rate was not significant difference among treatments (p>0.05). However, snail weight and height (1.66 g and 20.2 mm) in F3-10 was significantly higher than in others (p
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