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The ontogenetic development of the res system in the rainbow trout salmo gairdneri

, : The ontogenetic development of the res system in the rainbow trout salmo gairdneri. Journal of Fish Diseases 8(2): 189-196

The phagocytosis of colloidal carbon in the adults and fry of S. gairdneri Richardson was investigated. Adult fish accumulated trapped carbon in the spleen, kidney and heart. Fry, as early as 4 days post-hatch, had an efficient phagocytic system, the carbon being engulfed by free macrophages which accumulated in the connective tissue, under the skin, in the gut and in the gills. By 18 days post-hatch, the situation was similar to that found in the adult. The trapping of carbon in the gills of young fry is discussed, and it is suggested that it acts as a special mechanism to protect the thymus from undesirable, and possible tolerigizing antigen exposure before immunocompetence is attained.

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