A correlation between seasonally changing photoperiod, whole body lipid, and condition factor in juvenile spring Chinook salmon (Oncorhynchus tshawytscha)
Fig 2
Mean (± SE) length (A, B), weight (C, D), condition factor (E, F) and percent lipid (G, H) aligned by calendar date (A, C, E, G) and by photoperiod date (B, D, F, H) of Yakima spring Chinook salmon reared under three different photoperiod regimes, early emerge (circles), middle emerge (squares), and late emerge (triangles). Best fit polynomial regression curves (condition factor: y = 0.1386 + 0.0076x + 0.000017x2 + 1E-08x3, p = 0.00039, r2 = 0.798; % lipid: y = -3.483 + 0.05869x + -0.00006778x2, p = 0.00258, r2 = 0.630) are added to photoperiod date graphs to show seasonal trends in condition factor and lipid profiles.