Relationship between dietary lipid source, oxidative stress, and the physiological response to stress in sub-yearling chinook salmon ( Oncorhynchus tshawytscha )

摘要: Relationships between dietary lipid source, stress, and oxidative stress were examined in juvenile chinook salmon (Oncorhynchus tshawytscha). Four different experimental diets used: menhaden oil (MHO; elevated 20:5n-3 22:6n-3), soybean (SBO; 18:2n-6), linseed (LSO; 18:3n-3), a mixture of 55% 45% (MIX; approximately equal levels 18:2n-6 18:3n-3). Juvenile (initial body weight 16.0 g) fed for 12 weeks (early March to early June). At the end feeding, fish subjected low-water stressor 96 h had greater liver brain peroxidation compared unstressed controls; was not influenced by diet. Diet affected plasma cortisol levels. Stressed SBO greatest concentrations, followed MIX, MHO, LSO (mean concentrations differed significantly). The response may have been ratio prostaglandin 1- 2-series 3-series precursor fatty acids provided diets. results this study suggest connection physiological quality, stress. This is first evidence such relationship fish. Abbreviations: AA - arachidonic acid; ACTH adrenocorticotropin; BHT butylated hydroxytoluene; BLPO peroxidation; dGLA dihomo-γ-linolenic DHA docosahexanoic EPA eicosapentanoic FER feed efficiency ratio; FOX ferrous oxidation-xylenol orange; GLA -γ-linolenic LA linoleic LCO3 long-chain n-3 polyunsaturated acids; LLPO LN linolenic LPO oil; MHO MIX + PC cortisol; PG prostaglandin(s); PGE2- E2; PUFA oil.