Table 1.

Morphometric parameters of the gills, and ionoregulatory status of plasma ion concentrations of the scaleless carp in normoxic and hypoxic water

Hypoxia Recovery after hypoxia
Normoxia4 h8 h12 h24 h6 h12 h
Gill morphology (μm)
   Protruding lamellar height78.9±1.780.2±1.889.1±1.4*100.6±2.2*107.2±1.6*102.3±2.0*92.4±2.3*
   Protruding lamellar basal length350.8±6.7356.5±9.0368.8±9.3*389.0±10.5*412.3±11.6*388.4±7.1*364.7±8.5*
   Lamellar thickness11.8±0.511.8±0.910.6±0.6*9.1±0.3*8.4±0.4*10.6±0.8*11.2±0.4*
   Number of nuclei in interlamellar cell mass17.5±0.612.7±0.5*10.4±0.2*10.9±0.4*12.2±0.3*
Plasma ion levels (mmol l–1)
   Ca2+3.8±0.14.0±0.23.7±0.23.9±0.23.6±0.23.8±0.23.1±0.1*
   Mg2+0.8±0.01.2±0.1*1.0±0.0*1.0±0.00.9±0.00.7±0.00.8±0.0
   K+2.1±0.22.9±0.23.0±0.43.9±0.3*3.4±0.6*3.4±0.4*3.2±0.2
  • Values are means ± s.e.m. *Significantly different (P<0.05) from respective normoxic value