Morphofunctional characterization of the gills of Arapaima gigas

Morphofunctional characterization of the gills of Arapaima gigas

Changes during the transition from water breathing to air breathing

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The structure of the gills of the Amazonian fish Arapaima gigas, an obligate air breather, was analyzed during the transition to obligatory air breathing and the data obtained were related to its breathing mode. Gills from specimens with body mass between 2g and 5000g were collected, fixed and processed for morphometric, histochemical, immunohistochemical, transmission and scanning electron microscopy analyzes (fractional area of chloride cells - AFCC and density). In the initial stages of development of the species, the gill structure is similar to that of obligate aquatic breathers, but prof...