Morphology and function of gill mitochondria-rich cells in fish acclimated to different environments

Physiol Biochem Zool. Jan-Feb 2001;74(1):111-9. doi: 10.1086/319304.


The objective of this study is to test the hypothesis that morphologically different mitochondria-rich (MR) cells may be responsible for the uptake of different ions in freshwater-adapted fish. Tilapia (Oreochromis mossambicus) were acclimated to high-Ca, mid-Ca, low-Ca, and low-NaCl artificial freshwater, respectively, for 2 wk. Cell densities of wavy-convex, shallow-basin, and deep-hole types of gill MR cells as well as whole-body Ca(2+), Na(+), and Cl(-) influxes were measured. Low-Ca fish developed more shallow-basin MR cells in the gills and a higher Ca(2+) influx than those acclimated to other media. However, fish acclimated to low-NaCl artificial freshwater predominantly developed wavy-convex cells, and this was accompanied by the highest Na(+) and Cl(-) influxes. Relative abundance of shallow-basin and wavy-convex MR cells appear to be associated with changes in Ca(2+) and Na(+)/Cl(-) influxes, suggesting that shallow-basin and wavy-convex MR cells are mainly responsible for the uptake of Ca(2+) and Na(+)/Cl(-), respectively.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acclimatization*
  • Animals
  • Calcium / pharmacokinetics
  • Environment
  • Female
  • Gills / anatomy & histology
  • Gills / cytology*
  • Gills / physiology*
  • Male
  • Mitochondria
  • Sodium Chloride / pharmacokinetics
  • Tilapia / physiology*
  • Water / chemistry


  • Water
  • Sodium Chloride
  • Calcium