Duration of Protection againstAeromonas salmonicidain Brook Trout Immunostimulated with Glucan or Chitosan by Injection or Immersion
- 1 October 1994
- journal article
- Published by Oxford University Press (OUP) in The Progressive Fish-Culturist
- Vol. 56 (4) , 258-261
- https://doi.org/10.1577/1548-8640(1994)056<0258:dopaas>2.3.co;2
Abstract
Brook trout (Salvelinus fontinalis) were given the immunostimulants glucan or chitosan by single injections or by a 30-min immersion to induce protection against the fish disease furunculosis. At 1, 2, 3, 7, 14, 21, and 28 d after immunostimulation, sublots from these groups were challenged by a 1-min bath exposure to a 48-h culture of Aeromonas salmonicida. All four groups showed high levels of protection against challenges given 1, 2, and 3 d after immunostimulants were administered. The groups injected with the immunostimulants showed a higher degree of protection than the immersed fish. They also retained a higher degree of protection against the pathogen challenge. However, by 14 d after immunostimulation, protection in both groups was greatly reduced. No significant differences in protection levels were noted between the glucan and chitosan immunostimulants. The effective short-term protection induced by these immunostimulants demonstrates the importance of nonspecific defenses in fish and ...Keywords
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