1Tạp chí Nghiên cứu Khoa học 2013:1 x-y Trường Đại học Cần Thơ ẢNH HƯỞNG CỦA CÁC MẬT ĐỘ KHÁC NHAU ĐẾN SINH TRƯỞNG VÀ TỶ LỆ SỐNG CỦA ỐC BƯƠU ĐỒNG GIỐNG (Pila polita) Lê Văn Bình Ngơ Thị Thu Thảo1 7ABSTRACT This study was conducted to evaluate the effects of different stocking densities on the growth and 9survival rate of Black apple snail Pila polita There were replicates in each treatment and densities as 10follow: 300, 600, 900, 1200 ind.m-2 Snails with initial weight (0,03 g) and shell height (4,25 mm) were 11reared in the composite tanks and fed with industrial pellet (18% protein) After 35 days, the survival rate 12at 300 ind.m-2 (97.1%) was higher than at 600 ind m-2 (90.1%), 900 ind.m-2 (85.4%) and 1200 ind.m-2 13(83.4%), there was significant difference (P