Table 2.

Series 2. The percentage of nitrogenous wastes excreted in the form of urea and ammonia by toadfish during an initial 24 hour control period followed by a treatment period with either a peanut oil vehicle or various concentrations of RU-486 administered in the oil vehicle

Control period
Treatment period
RU-486 concentration (mg ml–1)% Urea-N% Ammonia-N% Urea-N% Ammonia-N
0† 81.3±5.2 18.6±5.2 81.3±6.9 18.7±6.9 
20 81.8±5.1 18.6±5.1 94.2±1.1* 5.8±1.1* 
50 84.2±2.6 15.8±2.6 94.5±1.0* 5.5±1.0* 
63 88.2±1.4 11.8±1.4 96.1±0.7* 3.8±0.7* 
75 84.4±6.3 15.6±6.3 93.2±2.1* 6.9±2.1* 
100 85.5±3.9 14.5±3.9 92.3±1.8* 7.7±1.7* 
125 91.5±4.1 8.5±4.1 97.8±0.8* 2.2±0.8* 
Control period
Treatment period
RU-486 concentration (mg ml–1)% Urea-N% Ammonia-N% Urea-N% Ammonia-N
0† 81.3±5.2 18.6±5.2 81.3±6.9 18.7±6.9 
20 81.8±5.1 18.6±5.1 94.2±1.1* 5.8±1.1* 
50 84.2±2.6 15.8±2.6 94.5±1.0* 5.5±1.0* 
63 88.2±1.4 11.8±1.4 96.1±0.7* 3.8±0.7* 
75 84.4±6.3 15.6±6.3 93.2±2.1* 6.9±2.1* 
100 85.5±3.9 14.5±3.9 92.3±1.8* 7.7±1.7* 
125 91.5±4.1 8.5±4.1 97.8±0.8* 2.2±0.8* 

Values are means ± s.e.m.; N=5

*

A significant difference in percentage excretion from the corresponding control period within the treatment group (P<0.05)

†

Peanut oil vehicle only (1.5 μl g–1 body mass)

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