ảnh hưởng của kích thước đến hiệu quả sinh sản của ốc bươu đồng (Pila polita)=Effects of broodstock size on the reproductive efficiency of black apple snail (Pila polita)

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Tác giả: Văn Bình Lê, Thị Thu Thảo Ngô, Văn Như ý Nguyễn, Văn Triệu Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học (Đại học Cần Thơ), 2024

Mô tả vật lý: tr.62-70

Bộ sưu tập: Metadata

ID: 159190

Thêm vào giỏ

Nghiên cứu được thực hiện nhằm đánh giá ảnh hưởng của kích thước ốc bươu đồng (Pila polita) đến các chỉ tiêu liên quan đến hiệu quả sinh sản. Thí nghiệm được bố trí với 3 nghiệm thức chiều cao của ốc bố mẹ và được lặp lại 3 lần là: 1) óc có chiều cao từ 30-35 mm (SC1)
2) ốc có chiều cao từ 40-45 mm (SC2) và 3) ốc có chiều cao 50-55mm (SC3). ốc bố mẹ được thu từ tự nhiên và nuôi trong 9 bể nhựa có thể tích 0,5 m3 với mật độ 15 cặp/bể để thu thập các chỉ tiêu liên quan đến quá trình sinh sản. Kết quả sau 90 ngày nuôi cho thấy sức sinh sản của ốc bươu đồng đạt cao nhất ở SC3 (118,79 trứng/cá thể) và khác biệt có ý nghĩa thống kê (p0,05) so với SC2 (74,19 trứng/cá thể) và SC1. Tỷ lệ nở của trứng ốc đạt cao nhất ở SC3 (79,59 phần trăm) tiếp đến là SC2 (76,72 phần trăm), tuy nhiên khác biệt không có ý nghĩa thống kê (p0,05). Các kết quả về khối lượng và đường kính trứng do ốc sinh sản, kích thức và khối lượng ốc mới nở đều đạt cao hơn ở ốc bố mẹ thuộc nhóm Sc3 (p0,05). Kết quả nghiên cứu này cho thấy ốc bươu đồng có chiều cao 50-55 mm thích hợp hơn so với nhóm chiều cao 30-35 mm hoặc 40-45mm trong việc chọn làm ốc bố mẹ phục vụ sản xuất giống nhân tạo.This study was carried out to determine the effects of broodstock size on the reproductive efficiency of black apple snail, Pila polita. Experiment was arranged with 3 size classes of broodstocks and was run triplicates per each class: 1) Shell height 30-35mm (SC1)
2) Shell height 40-45 mm (SC2)
3) Shell height 50-55 mm (SC3). Broodstocks were collected from the wild and maintained in 9 composite tanks (0.5m3/tank) at the density of 15 snail couples/tank. After 90 days of culture, broodstock snail at SC3 obtained highest reproduction efficiency (118.79 eggs/individual) and statistically significant difference (p0.05) from SC2 (74.19 eggs/individual) and SC1. Hatching rate of snail eggs reached highest at SC3 (79.59 percent) then SC2 (76.72 percent), but no statistically significant difference (p0.05). Results of weight and egg's diameter: size and weight of newly hatched snails of broodstock in SC3 presented higher than other size classes. Our findings show that snails with shell height in the range 50 - 55 mm are more suitable than 30-35mm or 40-45mm to select as broodstock for artificial seed production.

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