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  • Title: The immunostimulatory effects of sodium alginate and iota-carrageenan on orange-spotted grouper Epinephelus coicoides and its resistance against Vibrio alginolyticus.
    Author: Cheng AC, Tu CW, Chen YY, Nan FH, Chen JC.
    Journal: Fish Shellfish Immunol; 2007 Mar; 22(3):197-205. PubMed ID: 16784873.
    Abstract:
    The lysozyme activity, alternative complement activity (ACH50), respiratory burst, SOD (superoxide dismutase) activity and phagocytic activity of orange-spotted grouper Epinephelus coicoides were examined when the fish were injected intraperitoneally with sodium alginate at 10, 20, 30mgkg-1 and iota-carrageenan at 10, 20, 30mgkg-1, respectively after 24, 72 and 120 h. Serum ACH50 increased directly with dose after 24 and 72 h for both sodium alginate and iota-carrageenan treatments. The fish that received sodium alginate at 20mgkg-1 after 24 and 72 h, and the fish that received iota-carrageenan after 72 and 120 h showed significantly increased respiratory burst, SOD activity and phagocytic activity, respectively. In another experiment, E. coicoides which had been injected individually with sodium alginate and iota-carrageenan at 10, 20, 30mgkg-1, were challenged with Vibrio alginolyticus at 1.8x10(9) colony-forming units (cfu)fish-1 and then placed in seawater of 33 per thousand. The survival of fish that received sodium alginate at 20mgkg-1, and the fish that received iota-carrageenan at 30mgkg-1 was significantly higher than that of fish which received saline and the control fish after 48 h as well as at the termination of the experiment (120 h after the challenge). It is therefore concluded that E. coicoides which received sodium alginate at 20mgkg-1 or iota-carrageenan at 30mgkg-1 increased the non-specific immune response and resistance from V. alginolyticus infection.
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