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- W3141514112 abstract "Abstract The obligate air‐breathing Amazonian fish, Arapaima gigas , hatch as water‐breathing larvae but with development, they modify their swim bladder to an air‐breathing organ (ABO) while reducing their gill filaments to avoid oxygen loss. Here, we show that significant changes already take place between 4 weeks (1.6 g) and 11 weeks (5 g) post hatch, with a reduction in gill lamellar surface area, increase in gill diffusion distance, and proliferation of the parenchyma in the ABO. By using a variety of methods, we quantified the surface area and diffusion distances of the gills and skin, and the swim bladder volume and anatomical complexity from hatch to 11‐week‐old juveniles. In addition, we identified the presence of two ionocyte types in the gills and show how these change with development. Until 1.6 g, A. gigas possess only the H + ‐excreting/Na + ‐absorbing type, while 5‐g fish and adults have an additional ionocyte which likely absorbs H + and Cl − and excretes HCO 3 − . The ionocyte density on the gill filaments increased with age and is likely a compensatory mechanism for maintaining ion transport while reducing gill surface area. In the transition from water‐ to air‐breathing, A. gigas likely employs a trimodal respiration utilizing gills, skin, and ABO and thus avoid a respiratory–ion regulatory compromise at the gills." @default.
- W3141514112 created "2021-04-13" @default.
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- W3141514112 date "2021-04-05" @default.
- W3141514112 modified "2023-10-03" @default.
- W3141514112 title "Changes in gill and air‐breathing organ characteristics during the transition from water‐ to air‐breathing in juvenile <i>Arapaima gigas</i>" @default.
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- W3141514112 doi "https://doi.org/10.1002/jez.2456" @default.
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