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Fig. 5. Na+/K+-ATPase (green in A,C,E,G,I,K) and
Na+/K+/2Cl cotransporter (red in
B,D,F,H,J,L) immunoreactivity in the gills of lake trout (AD), brook
trout (EH) and Atlantic salmon (IL) kept in 0 p.p.t.
(freshwater; A,B,E,F,I,J) and those transferred gradually and kept in 30
p.p.t. (seawater) for 3 weeks (C,D,G,H,K,L). The nuclei were counterstained
with DAPI (blue). The primary filaments are horizontal, and about three
secondary lamellae are seen perpendicular to each filament. Scale bar, 20
µm.