Air Breathing and Ammonia Excretion in the Giant Mudskipper, Periophthalmodon schlosseri*

@article{Randall2004AirBA,
  title={Air Breathing and Ammonia Excretion in the Giant Mudskipper, Periophthalmodon schlosseri*},
  author={D. Randall and Y. Ip and S. Chew and J. M. Wilson},
  journal={Physiological and Biochemical Zoology},
  year={2004},
  volume={77},
  pages={783 - 788}
}
The giant mudskipper, Periophthalmodon schlosseri, is an amphibious, obligate, air‐breathing teleost fish. It uses its buccal cavity for air breathing and for taking and holding large gulps of air. These fish live in mud burrows at the top of the intertidal zone of mangrove mudflats; the burrow water may be hypoxic and hypercapnic and have high ammonia levels. The buccal epithelium is highly vascularized, with small diffusion distances between air and blood. The gill epithelium is densely… Expand
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The results confirm for the first time that P. schlosseri can effectively excrete a high load of ammonia on land, and corroborate the proposition that active NH(4) (+) excretion through its gills contributes in part to its high tolerance of aerial exposure. Expand
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Intermediary metabolism in mudskippers, Periophthalmodon schlosseri and Boleophthalmus boddarti, during immersion or emersion
TLDR
The phosphofructose kinase-1 (PFK) from the muscle of P. schlosseri became more sensitive to ATP inhibition after 6 h of emersion, indicating that a transient decrease in the glycolytic flux indeed occurred at this locus that led to an increase in glycogen content. Expand
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The unusual morphology of P. schlosseri's gill lamellae may be related to the animal's ability to effectively eliminate ammonia during air exposure and to the elimination of sodium chloride and ammonia. Expand
THE MUDSKIPPER PERIOPHTHALMODON SCHLOSSERI RESPIRES MORE EFFICIENTLY ON LAND THAN IN WATER AND VICE VERSA FOR BOLEOPHTHALMUS BODDAERTI
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Results confirmed that P. schlosseri, due to its special branchial morphological and morphometric adaptation, could respire more efficiently on land than in water and became significantly more alkaline upon terrestrial exposure. Expand
The mudskippers Periophthalmodon schlosseri and Boleophthalmus boddaerti can tolerate environmental NH3 concentrations of 446 and 36µM, respectively
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Results suggest that P. schlosseri might be able to maintain a low steady state level of internal ammonia during ammonia loading at a concentration which is lethal to other fishes. Expand
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Alkaline Environmental pH Has No Effect on Ammonia Excretion in the Mudskipper Periophthalmodon schlosseri but Inhibits Ammonia Excretion in the Related Species Boleophthalmus boddaerti
Experiments were performed to evaluate the effects of alkaline environmental pH on urea and ammonia excretion rates and on tissue urea, ammonia, and free amino acid concentrations in two mudskippers,Expand
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Immunolocalization of ion-transport proteins to branchial epithelium mitochondria-rich cells in the mudskipper (Periophthalmodon schlosseri).
TLDR
A proportion of the ammonia eliminated by P. schlosseri involves carbonic anhydrase activity and is not dependent on boundary-layer pH effects, and the apical CFTR-like anion channel may be serving as a HCO(3)(-) channel accounting for the acid-base neutral effects observed with net ammonia efflux inhibition. Expand
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TLDR
It was concluded that when P. schlosseri were active on land, they were capable of using certain amino acids as a metabolic fuel, and avoided ammonia toxicity through partial amino acid catabolism, which is the most cost-effective way of slowing down internal ammonia build-up without involving energy-expensive ammonia detoxification pathways. Expand
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Ammonia (NH 3 ) is only slightly more soluble (+3.4%) in the plasma of rainbow trout than in water, and its pK9 is only 0.14 units higher than in fresh water at 15 °C. Determination of theseExpand
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