... and larvae by administration of different concentrations of thiourea (TU) and T 3 , respectively, for 13 days. T 3 and TU had little effect on otolith growth during the larval stage. However, T 3 increased otolith growth and TU retarded, or stopped, otolith growth during the juvenile stage. Furthermore, TU...

...C. M. Pilley; P. A. Wright ABSTRACT We tested the hypothesis that urea transport in rainbow trout ( Oncorhynchus mykiss ) embryos is dependent, in part, on a bidirectional urea-transport protein. Acute exposure to phloretin and urea analogs [acetamide, thiourea, 1,(4-nitrophenyl)-2-thiourea...

... permeability; and (iii) the presence of a specific facilitated diffusion transport system that is periodically activated. Exposure of toadfish during non-pulse periods to treatments designed to block a ‘back-transport’ mechanism (Na + -free sea water or the urea analogues 30 mmol l −1 thiourea or 30 mmol l −1...