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Table 1.

Na+ and Cl- concentrations in the gut fluid of killifish

Salinity
Brackish waterFresh water
Killifish starved for 24 h   
    Na+ (mmol l-198.5±9.5 67.3±8.2 
    Cl- (mmol l-1109.2±12.3 99.4±19.4 
Killifish starved for 3 days   
    Na+ (mmol l-180.3±10.2 62.0±6.9 
    Cl- (mmol l-191.5±8.5 90.1±13.2 
Salinity
Brackish waterFresh water
Killifish starved for 24 h   
    Na+ (mmol l-198.5±9.5 67.3±8.2 
    Cl- (mmol l-1109.2±12.3 99.4±19.4 
Killifish starved for 3 days   
    Na+ (mmol l-180.3±10.2 62.0±6.9 
    Cl- (mmol l-191.5±8.5 90.1±13.2 

Values are means ± s.e.m. (N≥4).

Fluid fractions of the gut contents were analyzed 12 h after transfer in freshwater killifish. The duration of starvation had no effect on gut ion concentrations. Freshwater transfer caused a significant reduction in gut[Na+], when tested overall by 2-way ANOVA (P<0.05). There were no significant differences for any pair-wise comparisons.

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