title: The immune stimulatory effect of sodium alginate on the white shrimp Litopenaeus vannamei and its resistance against Vibrio alginolyticus.
abstract: The total haemocyte count (THC), differential haemocyte count (DHC), phenoloxidase activity, respiratory burst (release of superoxide anion), superoxide dismutase activity, phagocytic activity and clearance efficiency to the pathogen Vibrio alginolyticus were measured when the white shrimp Litopenaeus vannamei (9.4-11.3 g) were injected individually with sodium alginate at 10, 20 or 50 microg g(-1). No significant differences in THC, DHC and superoxide dismutase activity were observed among the shrimp injected with saline and those injected with sodium alginate at 10, 20 or 50 microg g(-1). However, L. vannamei injected with sodium alginate at 20 microg g(-1)increased its phenoloxidase activity and respiratory burst after 2 days and one day, respectively. L. vannamei injected with sodium alginate at 50 microg g(-1)maintained a higher phagocytic activity and clearance efficiency to V. alginolyticus after 4 days. In another experiment, L. vannamei which had been injected with sodium alginate, were challenged with V. alginolyticus at 2x10(5)colony-forming units (CFU) shrimp(-1)and then placed in seawater of 34 per thousand. The survival of shrimp that received sodium alginate at either dose was significantly higher than that of control shrimp at the termination of the experiment (6 days after the challenge). It is therefore concluded that L. vannamei received sodium alginate at 10 microg g(-1)or more and increased its immune ability and resistance from V. alginolyticus infection.
authors.affiliation: Department of Aquaculture, National Pingtung University of Science and Technology, Pingtung 912, Taiwan, ROC.
authors.forename: Winton
authors.initials: W
authors.lastname: Cheng
authors.forename: Chun-Hung
authors.initials: CH
authors.lastname: Liu
authors.forename: Su-Tuen
authors.initials: ST
authors.lastname: Yeh
authors.forename: Jiann-Chu
authors.initials: JC
authors.lastname: Chen
mesh_terms: D000464:Alginates / Q000494:pharmacology*; D000818:Animals; D001772:Blood Cell Count; D020723:Glucuronic Acid / Q000276:immunology / Q000494:pharmacology*; D006434:Hemocytes; D006603:Hexuronic Acids / Q000276:immunology / Q000494:pharmacology*; D007113:Immunity, Innate / Q000187:drug effects*; D007114:Immunization; D014442:Monophenol Monooxygenase / Q000378:metabolism; D033561:Penaeidae / Q000276:immunology* / Q000378:metabolism / Q000382:microbiology*; D010587:Phagocytosis / Q000276:immunology; D016897:Respiratory Burst / Q000276:immunology; D013482:Superoxide Dismutase / Q000378:metabolism; D013997:Time Factors; D044149:Vibrio alginolyticus / Q000276:immunology*
chemical_list: D000464:Alginates; D006603:Hexuronic Acids; D020723:Glucuronic Acid; D014442:Monophenol Monooxygenase; D013482:Superoxide Dismutase