Morphology and Function of Gill Mitochondria-Rich Cells in Fish Acclimated to Different Environments
Resource
Physiological and Biochemical Zoology 74 (1): 111-119
Journal
Physiological and Biochemical Zoology
Journal Volume
74
Journal Issue
1
Pages
111-119
Date Issued
2001
Date
2001
Author(s)
Chang, Il-Chi
Lee, Tsung-Han
Yang, Chi-Hwa
Wei, Yuan-Yaw
Chou, Fong-In
Hwang, Pung-Pung
Abstract
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.
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