Fig. 2. Urea-N and ammonia-N excretion rates for juvenile toadfish (N=7, 14–15 mm TL). Juveniles were reared from eggs collected in Biscayne Bay and were used within 1 week of full yolk-sac absorption. The percent of waste nitrogen expressed as urea-N (% ureotelic) appears above bar pairs at each 24 h sampling interval. Values are means + S.E.M.