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Table 1.

Effects of water PO2 on aerial respiratory parameters of Odontamblyopus lacepedii

Water PO2 (kPa)N% Air-breathing fishfAB (breaths h-1)aBreath-holding duration (% of total time of observation)a
Field burrow     
2.5b 71.4 7.3±2.9 53.7±28.7 
Laboratory chamber     
1.0 14 100 10.8±6.1* 88.4±6.3* 
3.1 14 35.7 7.9±5.5* 58.4±38.0* 
6.2 14 35.7 1.5±0.9 0.1±0.1 
10.4 14 21.4 2.0±2.6 0.1±0.2 
20.7 14 
Water PO2 (kPa)N% Air-breathing fishfAB (breaths h-1)aBreath-holding duration (% of total time of observation)a
Field burrow     
2.5b 71.4 7.3±2.9 53.7±28.7 
Laboratory chamber     
1.0 14 100 10.8±6.1* 88.4±6.3* 
3.1 14 35.7 7.9±5.5* 58.4±38.0* 
6.2 14 35.7 1.5±0.9 0.1±0.1 
10.4 14 21.4 2.0±2.6 0.1±0.2 
20.7 14 
a

Values presented are means ± s.d. of the air-breathing individuals.

b

Based from the asymptote of a curve of burrow-water PO2 (see legend for Fig. 4).

*

Significant difference from normoxic water(PO2=20.7 kPa) (Dunnett's test, P<0.05).

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