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Genetic analysis of lysozyme activity and resistance to vibriosis in farmed Chinook salmon, Oncorhynchus tshawytscha (Walbaum)
Author(s) -
Balfry S K,
Heath D D,
Iwama G K
Publication year - 1997
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1046/j.1365-2109.1997.00920.x
Subject(s) - oncorhynchus , biology , chinook wind , sire , lysozyme , outbreak , fishery , plant disease resistance , veterinary medicine , fish <actinopterygii> , zoology , gene , genetics , virology , medicine
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.