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Fig. 3. (A) Gill Na+,K+-ATPase activity (µmol ADP
mg-1 protein h-1), (B) plasma osmolality (mOsm), and (C)
plasma [chloride] (mmol l-1) levels for Shuswap sockeye salmon
captured in seawater and freshwater during migration to the spawning grounds
(distance, km). The mouth of the Fraser River is defined as 0 km. Sampling
locations as identified in Fig.
1. Spawners were sampled in Adams River, a major spawning
tributary in this system. The last two samples were collected on the spawning
grounds (480 km; H, holding, S, spawners), but sexually mature fish are offset
to prevent overlap of the data points. Sample size ranged from 74 (GS, 2002)
to 6 (QCI, 2003). Values are means ±
S.E.M. Symbols with a common letter do not
differ significantly.
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