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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 height 78.9±1.7 80.2±1.8 89.1±1.4* 100.6±2.2* 107.2±1.6* 102.3±2.0* 92.4±2.3* 
   Protruding lamellar basal length 350.8±6.7 356.5±9.0 368.8±9.3* 389.0±10.5* 412.3±11.6* 388.4±7.1* 364.7±8.5* 
   Lamellar thickness 11.8±0.5 11.8±0.9 10.6±0.6* 9.1±0.3* 8.4±0.4* 10.6±0.8* 11.2±0.4* 
   Number of nuclei in interlamellar cell mass 17.5±0.6 – – 12.7±0.5* 10.4±0.2* 10.9±0.4* 12.2±0.3* 
Plasma ion levels (mmol l–1       
   Ca2+ 3.8±0.1 4.0±0.2 3.7±0.2 3.9±0.2 3.6±0.2 3.8±0.2 3.1±0.1* 
   Mg2+ 0.8±0.0 1.2±0.1* 1.0±0.0* 1.0±0.0 0.9±0.0 0.7±0.0 0.8±0.0 
   K+ 2.1±0.2 2.9±0.2 3.0±0.4 3.9±0.3* 3.4±0.6* 3.4±0.4* 3.2±0.2 
Hypoxia
Recovery after hypoxia
Normoxia4 h8 h12 h24 h6 h12 h
Gill morphology (μm)        
   Protruding lamellar height 78.9±1.7 80.2±1.8 89.1±1.4* 100.6±2.2* 107.2±1.6* 102.3±2.0* 92.4±2.3* 
   Protruding lamellar basal length 350.8±6.7 356.5±9.0 368.8±9.3* 389.0±10.5* 412.3±11.6* 388.4±7.1* 364.7±8.5* 
   Lamellar thickness 11.8±0.5 11.8±0.9 10.6±0.6* 9.1±0.3* 8.4±0.4* 10.6±0.8* 11.2±0.4* 
   Number of nuclei in interlamellar cell mass 17.5±0.6 – – 12.7±0.5* 10.4±0.2* 10.9±0.4* 12.2±0.3* 
Plasma ion levels (mmol l–1       
   Ca2+ 3.8±0.1 4.0±0.2 3.7±0.2 3.9±0.2 3.6±0.2 3.8±0.2 3.1±0.1* 
   Mg2+ 0.8±0.0 1.2±0.1* 1.0±0.0* 1.0±0.0 0.9±0.0 0.7±0.0 0.8±0.0 
   K+ 2.1±0.2 2.9±0.2 3.0±0.4 3.9±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

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