The Company of Biologists

Table 1.

Series 1. The percentage of nitrogenous waste 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 saline vehicle or metyrapone

	Control period			Treatment period
Metyrapone concentration (mg ml^–1)	% Urea-N	% Ammonia-N	% Urea-N	% Ammonia-N
0^{^†}	87.1±5.6	12.8±7.1	88.6±6.2	12.7±6.9
20^{^‡}	93.8±1.1	6.9±1.9	85.2±4.2^{^*}	15.3±3.7^{^*}

	Control period			Treatment period
Metyrapone concentration (mg ml^–1)	% Urea-N	% Ammonia-N	% Urea-N	% Ammonia-N
0^{^†}	87.1±5.6	12.8±7.1	88.6±6.2	12.7±6.9
20^{^‡}	93.8±1.1	6.9±1.9	85.2±4.2^{^*}	15.3±3.7^{^*}

Values are means ± s.e.m.

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

†

Saline vehicle only (150 mmol l^–1 NaCl, 1.5 μl g^–1 body mass); N=6

‡

20 mg ml^–1 metyrapone (in 150 mmol l^–1NaCl, 1.5 μl g^–1 body mass); N=7

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