Na+ and Cl- concentrations in the gut fluid of killifish
| . | Salinity . | . | |
|---|---|---|---|
| . | Brackish water . | Fresh water . | |
| Killifish starved for 24 h | |||
| Na+ (mmol l-1) | 98.5±9.5 | 67.3±8.2 | |
| Cl- (mmol l-1) | 109.2±12.3 | 99.4±19.4 | |
| Killifish starved for 3 days | |||
| Na+ (mmol l-1) | 80.3±10.2 | 62.0±6.9 | |
| Cl- (mmol l-1) | 91.5±8.5 | 90.1±13.2 | |
| . | Salinity . | . | |
|---|---|---|---|
| . | Brackish water . | Fresh water . | |
| Killifish starved for 24 h | |||
| Na+ (mmol l-1) | 98.5±9.5 | 67.3±8.2 | |
| Cl- (mmol l-1) | 109.2±12.3 | 99.4±19.4 | |
| Killifish starved for 3 days | |||
| Na+ (mmol l-1) | 80.3±10.2 | 62.0±6.9 | |
| Cl- (mmol l-1) | 91.5±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.