Ảnh hưởng của các loại thức ăn đến sinh trưởng và tỉ lệ sống của ốc lác (Pila conica)

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Tác giả: Văn Bình Lê, Thị Thu Thảo Ngô

Ngôn ngữ: Vie

Ký hiệu phân loại: 639 Hunting, fishing, conservation, related technologies

Thông tin xuất bản: Khoa học (Đại học Cần Thơ) 2022

Mô tả vật lý: 124-131

Bộ sưu tập: Metadata

ID: 406200

Thêm vào giỏ Liên kết toàn văn

Nghiên cứu này được thực hiện nhằm đánh giá ảnh hưởng của các loại thức ăn đến sinh trưởng và tỉ lệ sống của ốc lác (Pila conica). Thí nghiệm gồm 5 nghiệm thức thức ăn khác nhau và mỗi nghiệm thức được lặp lại 3 lần gồm: 1) 100% thức ăn nhân tạo (TA), 2) 50% thức ăn nhân tạo + 50% mướp (M50), 3) 50% thức ăn nhân tạo + 50% bèo cám (B50), 4) 100% mướp (M100) và 5) 100% bèo (B100). Ốc lác có khối lượng và chiều cao ban đầu là 0,015 g và 3,25 mm, được ương trong bể composite với mật độ 500 con/bể. Tỉ lệ sống của ốc lác sau 35 ngày ương đạt cao nhất ở nghiệm thức B50 (93,7%) và M50 (93,1%), nhưng khác biệt không có ý nghĩa (p>
0,05) với nghiệm thức TA (90,47%). Khối lượng và năng suất ương ốc lác ở nghiệm thức B50 cao hơn và khác biệt có ý nghĩa (p<
0,05) so với các nghiệm thức còn lại. Kết quả thí nghiệm cho thấy thức ăn công nghiệp kết hợp với bèo cám (tỉ lệ 50:50 theo khối lượng khô) đã duy trì tỉ lệ sống cao và tăng trưởng tốt trong quá trình ương giống ốc lác., Tóm tắt tiếng anh, This study was conducted to evaluate the effects of different diets on the growth and survival rate of the snail (Pila conica). The experiment consisted of 5 different diets and each treatment was three replicates as follows: 1) 100% pellet (TA), 2) 50% pellet + 50% gourd loofah (M50), 3) 50% pellet +50% duckweed (B50), 4) 100% gourd loofah (M100), and 5) 100% duckweed (B100). The snail has initial weight and height of 0.015 g and 3.25 mm, respectively and was reared in composite tanks at a density of 500 ind./tank. The results after 35 days of rearing showed that the survival rates of the snails were highest in the treatment B50 (93.73%) and M50 (93.13%), but they were not significantly different (p>
0.05) if compared to the TA treatment (90.47%). The weight and productivity of snails in treatment B50 were higher and significant difference (p<
0.05) compared to those of other treatments. This study showed that pellet combined with duckweed at ratio of 50:50 (in DW) could maintain the high survival rate and growth performance of snail Pila conica in the rearing stage.

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