Ảnh hưởng số lần cho ăn lên tốc độ tăng trưởng của cá lóc (Channa striata) nuôi trong hệ thống tuần hoàn

Journal of Science – 2014, Vol. 4 (3), 79 – 84<br /> <br /> An Giang University<br /> <br /> ẢNH HƯỞNG SỐ LẦN CHO ĂN LÊN TỐC ĐỘ TĂNG TRƯỞNG CỦA CÁ LÓC<br /> (CHANNA STRIATA) NUÔI TRONG HỆ THỐNG TUẦN HOÀN<br /> Phan Thị Thanh Vân1, Cao Văn Thích2<br /> 1<br /> <br /> ThS. Khoa Nông nghiệp & Tài nguyên Thiên nhiên, Trường Đại học An Giang<br /> ThS. Trường Trung Cấp Kinh tế - Kỹ thuật An Giang<br /> <br /> 2<br /> <br /> Thông tin chung:<br /> Ngày nhận bài: 19/06/14<br /> Ngày nhận kết quả bình duyệt:<br /> 05/09/14<br /> Ngày chấp nhận đăng:<br /> 22/10/14<br /> Title:<br /> An effect of feeding frequency<br /> on the growth of snakehead<br /> (Channa striata) reared in<br /> recirculation systems<br /> Từ khóa:<br /> Cá Lóc, số lần cho ăn, hệ<br /> thống tuần hoàn<br /> Keywords:<br /> Snakehead fish, feeding times,<br /> recirculation system<br /> <br /> ABSTRACT<br /> Effect of feeding frequency on the growth of snakehead fish (Channa striata) was<br /> examined in a completely random design with 4 treatments (the number of times<br /> feeding: 1 times (11h) 2 times (6h, 18h); 3 times (5h, 12h, 19h) and 4 times/day<br /> (5h, 11h, 17h, 23h)) and 3 replicates. Stocking density was 40 fish / 100 liters<br /> and feed given as pellets containing 40% protein. The experiment was carried<br /> out over 110 days. The results of the experiment showed that the pH of the<br /> treatments ranged from 6.4 to 7.5 and tended to decrease. The factors TAN, NO 3, NO2-tended to increase during raising. The results offeeding 3 and 4 times/day<br /> had the best growth in weight and the difference was statistically significant (P<br /> 0.05). The feed<br /> conversion ratio of treatments 3 and 4 were lower than treatments 1 and 2.<br /> Similarly, the Protein efficiency ratio of treatments 3 and 4 were higher than<br /> treatments 1 and 2 and the difference between them was statistically significant<br /> (P