Abstract
A humoral antibody response was demonstrated by Western blotting and Crossover immunoelectrophoresis, in Atlantic salmon (Salmo salar L.) immunised with crude extracts derived from the copepod ectoparasites (sea lice) Caligus elongatus (Nordmann) and Lepeophtheirus salmonis (Kroyer). Antibodies were not detected in control fish. Many cross-reacting antigens were observed between both sea lice species and their various life stages. The antigenic components most clearly resolved on blots probed with salmon sera were in excess of approximately 75 kDa, although equal numbers of components of lower molecular weight were identified. The response from Atlantic salmon was compared to that from rabbits immunised with similar sea lice extracts. On blots probed with rabbit antisera a greater number of antigenic components were identified than from salmon immunoblots. Antigenic components detected with rabbit antisera were more clearly stained with little distinction between components of high or low molecular weights.
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