We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Mitochondrion-rich cells distribution, Na/K-ATPase activity and gill morphometry of the Amazonian freshwater stingrays (Chondrichthyes: Potamotrygonidae).
- Authors
Duncan, Wallice; Silva, Naara; Fernandes, Marisa
- Abstract
Detailed measurements of gill area and constituent variables (total filament number, total filament length and mean filament length), and immunolocalization of the α-subunit of Na/K-ATPase and Na/K-ATPase activity were performed on both hemibranchs of all five arches of freshwater potamotrygonid stingrays ( Paratrygon aiereba and Potamotrygon sp.). Both species exhibit similar mass-specific gill area, 89.8 ± 6.6 and 91.5 ± 4.3 mm g for P. aiereba and Potamotrygon sp., respectively. The density of Na/K-ATPase-rich MRCs and Na/K-ATPase activity was higher in the 4th gill arch in both species. The Na/K-ATPase activity was positively correlated to the Na/K-ATPase-rich (Na/K-ATPase rich) mitochondrion-rich cell (MRC) distribution among the gill arches of P. aiereba but not in Potamotrygon sp. The levels Na/K-ATPase activity were not correlated to the gill surface area among the arches for both rays' species. Considering that the Na/K-ATPase-rich MRC is the main site for active ion transport in the gill epithelia and Na/K-ATPase activity plays a crucial role in osmoionoregulatory function, we suggesting that 4th gill arch is more relevant for osmoregulation and ion balance in these potamotrygonids.
- Subjects
FRESHWATER stingrays; FISH morphology; MITOCHONDRIA; ADENOSINE triphosphatase; BRANCHIAL arch; OSMOREGULATION; ELASMOBRANCH fisheries; CHLORIDE cells
- Publication
Fish Physiology & Biochemistry, 2011, Vol 37, Issue 3, p523
- ISSN
0920-1742
- Publication type
Article
- DOI
10.1007/s10695-010-9454-z