Fig.2. Plasma total ammonia content (A), plasma pH (B) and plasma [NH3] (C) in rainbow trout exposed either to 288µmoll-1 total ammonia for 24h (open bars) or to water with no added ammonia (filled bars). Values (mean ± S.E.M., N=6) are shown for fish swum for 24h at 0.75BLs-1, at the swimming speed showing the lowest concentration of ammonia for each fish, and at Ucrit. *Significant difference from the 0.75BLs-1 overnight value (t-test, P<0.05); 
significant difference from the lowest plasma ammonia value (P<0.05).
