Title
Gill morphology and acute hypoxia : responses of mitochondria-rich, pavement, and mucous cells in the Amazonian oscar (**Astronotus ocellatus**) and the rainbow trout (**Oncorhynchus mykiss**), two species with very different approaches to the osmo-respiratory compromise Gill morphology and acute hypoxia : responses of mitochondria-rich, pavement, and mucous cells in the Amazonian oscar (**Astronotus ocellatus**) and the rainbow trout (**Oncorhynchus mykiss**), two species with very different approaches to the osmo-respiratory compromise
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
Ottawa ,
Subject
Biology
Source (journal)
Canadian journal of zoology. - Ottawa, 1951, currens
Volume/pages
89(2011) :4 , p. 307-324
ISSN
0008-4301
0008-4301
ISI
000291185800006
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The hypoxia-intolerant rainbow trout (Oncorhynchus mykiss (Walbaum, 1792)) exhibits increased branchial ion permeability and Na+ influx during acute exposure to moderate hypoxia (Po2 = 80 torr; 1 torr = 133.3224 Pa), manifesting the usual trade-off between gas exchange and electrolyte conservation. In contrast, the hypoxia-tolerant oscar (Astronotus ocellatus (Agassiz, 1831)) is unusual in exhibiting decreased branchial ion permeability to ions and Na+ influx during acute exposure to severe hypoxia (Po2 = 1020 torr). These different physiological approaches to the osmo-respiratory compromise correlate with rapid, oppositely directed changes in gill morphology. In oscar, pavement cells (PVCs) expanded, partially covering neighboring mitochondria-rich cells (MRCs), which were recessed and reduced in size. Those remaining open were transformed from shallow-basin to deep-hole forms with smaller openings, deeper apical crypts, and smaller numbers of subapical microvesicles, changes that were largely reversed during normoxic recovery. In contrast, moderate hypoxia caused outward bulging of MRCs in rainbow trout with increases in size, surface exposure, and number of subapical microvesicles, accompanied by PVC retraction. These changes were partially reversed during normoxic recovery. In both rainbow trout and oscar, hypoxia caused discharge of mucus from enlarged mucous cells (MCs). Rapid, divergent morphological changes play an important role in explaining two very different physiological approaches to the osmo-respiratory compromise.
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