Excretion and Distribution of Ammonia and the Influence of Boundary Layer Acidification in Embryonic Rainbow Trout (Oncorhynchus Mykiss)

This study examined ammonia excretion by embryos of the rainbow trout (Oncorhynchus mykiss). The distribution of ammonia in relation to the H+ distribution and electrical potential was determined. The influence of the pH of the unstirred layer (USL) of water next to the external surface of the embryo was also assessed. Eyed-up embryos (35­40 days post-fertilization) were exposed to various external water conditions [pH 6.0, pH 10.0, 1.6 mmol …