... cardiorespiratory responses to environmental hypercarbia in the air-breathing fish, Hoplerythrinus unitaeniatus (jeju). Fish were exposed to graded hypercarbia (1, 2.5, 5, 10 and 20% CO 2 ) and also to graded levels of environmental acidosis (pH ~7.0, 6.0, 5.8, 5.6, 5.3 and 4.7) equal to the pH levels...

...D. J. McKenzie; H. A. Campbell; E. W. Taylor; M. Micheli; F. T. Rantin; A. S. Abe SUMMARY The jeju is a teleost fish with bimodal respiration that utilizes a modified swim bladder as an air-breathing organ (ABO). Like all air-breathing fish studied to date, jeju exhibit pronounced changes in heart...

... the possibility that that the evolutionary loss of hypoxic bradycardia may have coincided with some forms of air breathing in fishes. Experiments are needed to test some of these possibilities. Ultimately, any potential benefit of hypoxic bradycardia must be placed in the proper context of myocardial oxygen...

...% of air saturation, and that it can tolerate at least 2 h at even lower O 2 levels. Furthermore, during air exposure, which was tolerated for more than 3 h, it upheld a rate of O 2 consumption that was 60% of that in water. The hypoxia tolerance and air breathing abilities enables this fish to stay...

...Matthieu R. Gervais; Bruce L. Tufts ABSTRACT The purpose of this study was to examine the subcellular distribution and isoenzyme characteristics of carbonic anhydrase from the gills and respiratory air bladder of bowfin Amia calva , a primitive air-breathing fish. Separation of subcellular...

...Brian R. Mcmahon; Warren W. Burggren ABSTRACT The Japanese weatherloach ( Misgurns anguillicaudatus Cantor) can exchange gases both with water, via gills and skin, and with air, via the posterior region of the alimentary canal (intestine). Air breathing occurs by unidirectional ventilation...

... these costs, and intermittent gill use in aquatic breathing, which is the exact analogue of the pattern for branchial respiratory use during air breathing, seems to optimize aquatic O 2 uptake with minimal ventilatory cost. * Present address: Department of Zoology, University of British Columbia...

...Jeffrey B. Graham; Troy A. Baird ABSTRACT Synbranchus marmoratus (Bloch) breathes air during terrestrial excursions and while dwelling in hypoxic water and utilizes its gills and adjacent buccopharyngeal epithelium as an air-breathing organ (ABO). This fish uses gills and skin for aquatic...