Genetic analysis of lysozyme activity and resistance to vibriosis in farmed Chinook salmon, Oncorhynchus tshawytscha (Walbaum) |
| |
| Authors: | S K Balfry D D Heath G K Iwama |
| |
| Institution: | Department of Animal Science and the Canadian Bacterial Diseases Network, University of British Columbia, Vancouver, BC, Canada;Faculty of Natural Resources and Environmental Studies, University of Northern British Columbia, Prince George, BC, Canada;Department of Animal Science and the Canadian Bacterial Diseases Network, University of British Columbia, Vancouver, BC, Canada |
| |
| Abstract: | Twelve full-sib families of chinook salmon, Oncorhynchus tshawytscha (Walbaum), reared in two environments, were examined for differences in disease resistance following a natural outbreak of vibriosis on a commercial salmon farm in British Columbia, Canada. The two replicate groups differed in early rearing conditions, time of introduction to sea water, and netpen environment. Family mortality data revealed a significant genetic component to disease resistance (sire and dam). Cumulative mortalities in the two replicate groups were significantly different, at 8.1% and 5.7%. There were no significant genotype-by-environment interactions, indicating that the genetic contribution to the disease resistance was stable across environments. Plasma lysozyme activity in both environmental groups was found to have a significant genetic component (sire). There was a significant positive correlation between plasma lysozyme activity and vibriosis mortality. |
| |
| Keywords: | |
|
|
