The effects of gamma irradiation on the lymphoid organs of rainbow trout and subsequent susceptibility to fish pathogens.

摘要: Fish were irradiated with 60Co gamma rays at doses ranging from 10 to 50 Gy. Lethal determined in fishes of different ages. For a given dose, fry and fingerlings more susceptible than subadults. Whatever the irradiation dose was, fish displayed sharp decrease blood leucocyte count. At lowest doses, this acute leucopaenia was reversible. The cellular damage lymphoid organs particularly obvious thymus. depletion cells immunocompetent decreased (viral hemorrhagic septicaemia, VHS) or increased (Y. ruckeri, A salmonicida) susceptibility trout pathogens. suppressive effect radiation age dependent. Irradiation appeared be reliable technique detect asymptomatic carrier fish.