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Fig. 1. Group mean
max ± 2 s.e.m. of rods for the control
group (circles) and TH treatment group (triangles) from Experiment I performed
January–March (A) and Experiment II performed in July and August (B).
Each point is the mean rod
max of all coho salmon
(Oncorhynchus kisutch, Walbaum) sampled at the specified time point
(N values below error bars equal number of fish). The mean
max for each fish was based on the mean
max of
20 rods measured using MSP. Treated fish
received commercial salmon pellets sprayed with 12 p.p.m. T3 and
120 p.p.m. T4 by weight dissolved in ethanol. The horizontal bar
shows the timing of the transition from the treatment (gray) to the control
(white) diet for the treatment group. The control group remained on a diet of
commercial salmon pellets sprayed with ethanol only for the duration of the
experiments.