Ions first: Na+ uptake shifts from the skin to the gills before O2 uptake in developing rainbow trout, Oncorhynchus mykiss.

@article{Fu2010IonsFN,
  title={Ions first: Na+ uptake shifts from the skin to the gills before O2 uptake in developing rainbow trout, Oncorhynchus mykiss.},
  author={Clarice Fu and Jonathan M Wilson and Peter J Rombough and Colin J Brauner},
  journal={Proceedings. Biological sciences},
  year={2010},
  volume={277 1687},
  pages={1553-60}
}
This is the first direct physiological evidence in support of the ionoregulatory hypothesis, challenging the long-held assumption that teleost gills develop initially for gas exchange. Resting unidirectional sodium (Na(+)) uptake and oxygen (O(2)) uptake across the skin and gills were measured simultaneously in larval rainbow trout, Oncorhynchus mykiss, during development. In soft and hard water, Na(+) uptake shifted to the gills by 15 and 16 days post-hatch (dph) while O(2) uptake took 50-80… CONTINUE READING