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Host‐parasite interactions between Ichtyobodo necator (Henneguy, 1883) and farmed salmonids
Author(s) -
ROBERTSON D. A.
Publication year - 1979
Publication title -
journal of fish diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 85
eISSN - 1365-2761
pISSN - 0140-7775
DOI - 10.1111/j.1365-2761.1979.tb00409.x
Subject(s) - biology , parasite hosting , fish <actinopterygii> , host (biology) , infestation , zoology , fish farming , veterinary medicine , aquaculture , fishery , ecology , botany , medicine , world wide web , computer science
. The prevalence and intensity of Ichtyobodo necator infestations on farmed salmonids was investigated over a 7‐month period. The infestations were found to be markedly age dependent. Ichtyobodo infestations peaked at 4 weeks after commencement of first feeding and mortalities peaked at 4 6% per week at 8 weeks in the 0+ fish. Both infestations and mortalities showed a marked decline to zero shortly after these periods with no chemotherapy. No Ichtyobodo were seen on the 1+ fish until late in the study after a drop in temperature to below 10°C, when they reappeared on the 0+fish also. Ichtyobodo were found at temperatures between 3–5°C and 16°C and in the 0+fish appeared irrespective of the condition of the fish. It is suggested that some form of host defence mechanism is operating which limits the Ichtyobodo infestations in farmed salmonids.