Journal of Science – 2014, Vol (3), 79 – 84 An Giang University ẢNH HƯỞNG SỐ LẦN CHO ĂN LÊN TỐC ĐỘ TĂNG TRƯỞNG CỦA CÁ LÓC (CHANNA STRIATA) NI TRONG HỆ THỐNG TUẦN HỒN Phan Thị Thanh Vân1, Cao Văn Thích2 ThS Khoa Nơng nghiệp & Tài nguyên Thiên nhiên, Trường Đại học An Giang ThS Trường Trung Cấp Kinh tế - Kỹ thuật An Giang Thông tin chung: Ngày nhận bài: 19/06/14 Ngày nhận kết bình duyệt: 05/09/14 Ngày chấp nhận đăng: 22/10/14 Title: An effect of feeding frequency on the growth of snakehead (Channa striata) reared in recirculation systems Từ khóa: Cá Lóc, số lần cho ăn, hệ thống tuần hoàn Keywords: Snakehead fish, feeding times, recirculation system ABSTRACT Effect of feeding frequency on the growth of snakehead fish (Channa striata) was examined in a completely random design with treatments (the number of times feeding: times (11h) times (6h, 18h); times (5h, 12h, 19h) and times/day (5h, 11h, 17h, 23h)) and replicates Stocking density was 40 fish / 100 liters and feed given as pellets containing 40% protein The experiment was carried out over 110 days The results of the experiment showed that the pH of the 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 and times/day had the best growth in weight and the difference was statistically significant (P 0.05) The feed conversion ratio of treatments and were lower than treatments and Similarly, the Protein efficiency ratio of treatments and were higher than treatments and and the difference between them was statistically significant (P