Mục đích của nghiên cứu là nhằm đánh giá ảnh hưởng của tảo Haematococcus pluvialis lên khả năng tăng cường hệ miễn dịch tự nhiên và đồng thời tăng cường sức đề kháng của cá tra kháng bệnh gan thận mủ gây ra bởi vi khuẩn Edwardsiella ictaluri.
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- THAÙNG 7/2013 95 VIỆN NGHIÊN CỨU NUÔI TRỒNG THỦY SẢN immune parameters of Stripped catfish fingerling, its susceptibility to E ictaluri and flesh color were determined when the fish were fed diets containing Haematococcus pluvialis at 0% (control), 0,5% and 1% for weeks Results showed that phagocytic activity (PA) of fish fed 0,5% and 1% of Haematococcus pluvialis diets were significantly higher than those of fish fed the control diet after weeks of feeding, and increased 3,78 and 3,29-fold, respectively, compared to the control group Howerver, phagocytic indexes (PI) were not significantly different between the groups Superoxide anion production of head kidney leucocytes of fish fed diet containing 1% HP was significantly higher than those of fish fed the control diet and increased 1.84-fold, compared to control group However, lysozyme activity of fish was not significant difference between groups Fish fed 0,5% and 1% HP containing diets had significantly higher survival rates than those of fish fed the control diet after challenge with E ictaluri, and increased by 26,6% and 23,3%, respectively, compared to control group Furthermore, there was no effect of HP on flesh fish color after fish fed diets containing HP for weeks We therefore recommend dietary Haematococcus pluvialis administration at 0,5% and 1% to enhance immunity and resistance against Key words: Haematococcus pluvialis, innate immune, Bacillary Necrosis of Pangasius, astaxanthin, Edwardsiella ictaluri Người phản biện: TS Lê Hồng Phước Ngày nhận bài: 6/6/2013 Ngày thông qua phản biện: 26/6/2013 Ngày duyệt đăng: 8/7/2013 96 Department of Experimental Biology, Research Institute for Aquaculture No2 Email: sonvm.ria2@mard.gov.vn TẠP CHÍ NGHỀ CÁ SÔNG CỬU LONG - - THÁNG 7/2013 ... THE EFFECTS OF Haematococcus pluvialis ON INNATE IMMUNE AND RESISTANCE OF STRIPPED CATFISH (Pangasianodon hypophthalmus) AGAINST TO BACILLARY NECROSIS Vo Minh Son1, Van Thi Thuy1 ABSTRACT Astaxanthin... weeks We therefore recommend dietary Haematococcus pluvialis administration at 0,5% and 1% to enhance immunity and resistance against Key words: Haematococcus pluvialis, innate immune, Bacillary... fed diets containing Haematococcus pluvialis at 0% (control), 0,5% and 1% for weeks Results showed that phagocytic activity (PA) of fish fed 0,5% and 1% of Haematococcus pluvialis diets were