Relationship of insulin-like growth factor-I and insulin to size and adiposity of under-yearling chinook salmon.
Sub-yearling spring chinook salmon were fed either a LoFat or HiFat diet from February to November. Fish were sampled over 2 days in November, following 24- and 48-h fasts. Length vs. weight relationships between fish fed the two diets were similar; however, fish fed the HiFat diet had roughly twice the body lipid as fish fed the LoFat diet (9% vs. 4.5%, respectively). Plasma IGF-I vs. length relations between fish fed the two diets were similar; overall, there was a strong relation between plasma IGF-I and length (r(2)=0.53). Similarly, plasma log (insulin) vs. length relations did not vary between the two diets; however, the relationship of log (insulin) vs. length was weak (r(2)=0.2). There was little or no relationship between plasma IGF-I or log (insulin) and body adiposity. Finally, there was a weak relationship between plasma IGF-I and log (insulin) (r(2)=0.23).
Beckman
B R
BR
Integrative Fish Biology Program, Northwest Fisheries Science Center, National Marine Fisheries Service, 2725 Montlake Boulevard East, Seattle, WA 98112, USA. brian.beckman@noaa.gov
Shearer
K D
KD
Cooper
K A
KA
Dickhoff
W W
WW
D000273:Adipose Tissue; D000818:Animals; D001824:Body Constitution; D018752:Diet, Fat-Restricted; D007328:Insulin / Q000097:blood*; D007334:Insulin-Like Growth Factor I / Q000378:metabolism*; D012474:Salmon / Q000502:physiology*
D007328:Insulin; D007334:Insulin-Like Growth Factor I