Table 1.

The total number of air-phase depositions by laboratory burrow-dwelling S. histophorus for periods ranging from 1-11 days

FishMass (g)SexNo. days observedWater PO2 range (kPa)No. air-phase depositions*
13.7M20.4-1.84
6.2F
25.8M12.91
3.1F
32.8F40.5-0.77
45.9F50.5-0.99
54.6F110.5-4.412
65.3F53.1-3.46
75.9F51.2-3.98
85.1M81.1-6.614
93.7M60.7-2.75
103.5M31.5-3.46
  • Fish were initially placed in the burrow system with no air phase. When observations at a later time indicated that air had accumulated in the chamber, the entire volume was removed and measured. Each subsequent air deposition was recorded and its volume measured.

    All fish and pairs of fish tested deposited an air phase and most did this repeatedly.

  • * Each air-phase deposition occurred within 24 h of withdrawal of the previous air phase by the experimenter.