Ảnh hưởng của việc thay thế thức ăn chế biến bằng thức ăn Lansy PL lên tăng trưởng và tỉ lệ sống ấu trùng tôm càng xanh (macrobrachium rosenbergii)

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Tác giả: Văn Đầy Phạm

Ngôn ngữ: Vie

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

Thông tin xuất bản: Tạp chí Khoa học Trường Đại học Trà Vinh, 2022

Mô tả vật lý: 104-111

Bộ sưu tập: Metadata

ID: 419979

Thêm vào giỏ Liên kết toàn văn

Nghiên cứu được thực hiện nhằm tìm ra số lần thay thế thức ăn chế biến bằng Lansy PL. Thí nghiệm gồm bốn nghiệm thức là ấu trùng tôm càng xanh được cho ăn với các chế độ ăn khác nhau. Nghiệm thức 1 (đối chứng) cho ăn ba lần thức ăn chế biến và hai lần Artermia. Nghiệm thức 2 (thay thế một lần Lansy PL) cho ăn hai lần thức ăn chế biến, một lần Lanzy PL và hai lần Artermia. Nghiệm thức 3 (thay thế hai lần Lansy PL) cho ăn một lần thức ăn chế biến, hai lần Lansy PL và hai lần Artermia. Nghiệm thức 4 (thay thế ba lần Lansy PL) cho ăn ba lần Lansy PL và hai lần Artermia. Bể ương có thể tích 120 L, mật độ ương 60 con/L, độ mặn 12o /oo. Sau 30 ngày ương, nghiệm thức 3 thay thế hai lần Lansy PL cho kết quả chỉ số biến thái là 10,73 ± 0,06 cao nhất, không khác biệt (p >
0,05) với nghiệm thức thay thế một lần thức ăn Lanzy PL, nhưng khác biệt (p <
0,05) so với hai nghiệm thức còn lại và chiều dài Postlarvae 15 là 9,83 ± 0,09 mm, tỉ lệ sống là 62,78 ± 0,66%, năng suất là 37,67 ± 0,40 con/L cũng tốt nhất, khác biệt (p <
0,05) so với các nghiệm thức còn lại. Vì vậy, việc thay thế thức ăn chế biến bằng Lansy PL với hai lần ăn/ngày cho kết quả tốt nhất khi ương ấu trùng tôm càng xanh., Tóm tắt tiếng anh, This study aimed to research the effects of replacing farm-made feed with Lansy PL. The experiment consisted of 4 treatments in which giant freshwater prawn larvae were fed with different feeding regimes. Treatment 1 (Control) consisted of 03 feeding times of farmmade feed and 02 times of Artermia per day
Treatment 2 consisted of 2 times of farm-made feed, 1 time of Lansy PL and 2 times of Artermia per day
Treatment 3 consisted of 1 time of farmmade feed, 2 times of Lansy PL and 2 times of Artermia per day
and Treatment 4 consisted of 3 times of Lansy PL and 2 times of Artermia per day. Each container for larval rearing was made of plastic and had a volume of 120 liters, and larvae were stocked at a density of 60 inds/l with water salinity at 12o /oo. After 30 days of rearing, Treatment 3 reached the highest metamorphosis index of 10.73 ± 0.06, which was not statisticaly different (p >
0.05) than the treatment substituting Lanzy PL 1 time per day, but was statistically different from the other two treatments. The length of Postlarvae 15 was 9.83 ± 0.09 mm, and the survival rate was 62.78 ± 0.66%. Its yield of 37.67 ± 0.40 fish/L was also the best and was statistically different compared to the rest of the treatments. Therefore, the results of the study conclude that replacing farm-made feed with Lansy PL for 2 meals per day gives the best results when rearing giant freshwater prawn larvae.

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