Table 1.

Plasma Na+ and Cl- levels of Arctic char, rainbow trout and Atlantic salmon acclimated to freshwater or seawater for up to 30 days

Days in freshwater (control) Days in seawater (32‰)
Species[Ion] (mEq l-1)1301241030
Arctic charNa+150.3±2.8152.1±2.5208.6±7.6*231.4±9.3*ND216.7±21.2*181.2±13.6*,a
Cl-137.0±1.9138.3±2.9167.5±8.2*174.5±7.4*ND168.5±17.0*155.2±10.1*,a
Atlantic salmonNa+158.0±2.9153.2±6.2NDND171.2±6.4*156.2±1.5b158.9±2.0b
Cl-134.0±1.7130.5±3.2NDND136.9±3.5124.0±1.9b121.1±0.7b
Rainbow troutNa+157.4±1.3159.7±3.5ND210.0±12.9*218.3±4.6*198.6±16.3*165.8±5.2a
Cl-131.4±2.2136.2±2.8ND159.3±5.4*172.7±4.9*159.5±10.8*139.8±4.2a
  • Values are means ± s.e.m.; sample size ranged from 5 to 8, as listed in Results.

    ND, not determined (species not sampled on that day).

    Interspecies comparisons not included in table, see Results.

  • * Significantly different (P<0.05) from both freshwater control groups.

  • a Significantly different (P<0.05) from all other corresponding seawater groups.

  • b Significantly different (P<0.05) from corresponding 4 day seawater group.