scholarly journals A comparison of the effects of environmental ammonia exposure on the Asian freshwater stingray Himantura signifer and the Amazonian freshwater stingray Potamotrygon motoro

2003 ◽  
Vol 206 (20) ◽  
pp. 3625-3633 ◽  
Author(s):  
Y. K. Ip
Keyword(s):  
Freshwater Stingray ◽  
Himantura Signifer ◽  
Ammonia Exposure

Histology of the digestive tract of the freshwater stingray Himantura signifer Compagno and Roberts, 1982 (Elasmobranchii, Dasyatidae)

2006 ◽  
Vol 211 (5) ◽  
pp. 507-518 ◽  
Author(s):  
Kannika Chatchavalvanich ◽  
Ricardo Marcos ◽  
Jintana Poonpirom ◽  
Amara Thongpan ◽  
Eduardo Rocha
Keyword(s):  
Digestive Tract ◽  
Freshwater Stingray ◽  
Himantura Signifer

Ultrastructure of spermiogenesis in a freshwater stingray, Himantura signifer

2005 ◽  
Vol 52 (4) ◽  
pp. 379-385 ◽  
Author(s):  
Kannika Chatchavalvanich ◽  
Amara Thongpan ◽  
Masaaki Nakai
Keyword(s):  
Freshwater Stingray ◽  
Himantura Signifer

Anatomy of the Ampullary Electroreceptor in the Freshwater Stingray, Himantura signifer

Copeia ◽  
1997 ◽  
Vol 1997 (1) ◽  
pp. 101 ◽  
Author(s):  
William Raschi ◽  
Elaine D. Keithan ◽  
William C. H. Rhee
Keyword(s):  
Freshwater Stingray ◽  
Himantura Signifer

Pendrin immunoreactivity in the gill epithelium of a euryhaline elasmobranch

2002 ◽  
Vol 283 (4) ◽  
pp. R983-R992 ◽  
Author(s):  
Peter M. Piermarini ◽  
Jill W. Verlander ◽  
Ines E. Royaux ◽  
David H. Evans
Keyword(s):  
Collecting Duct ◽  
Apical Region ◽  
Intercalated Cells ◽  
Cortical Collecting Duct ◽  
Gill Epithelium ◽  
Dasyatis Sabina ◽  
Proton Atpase ◽  
Atlantic Stingray ◽  
Freshwater Stingray ◽  
Gill Lamellae

Pendrin is an anion exchanger in the cortical collecting duct of the mammalian nephron that appears to mediate apical Cl−/HCO[Formula: see text]exchange in bicarbonate-secreting intercalated cells. The goals of this study were to determine 1) if pendrin immunoreactivity was present in the gills of a euryhaline elasmobranch (Atlantic stingray, Dasyatis sabina), and 2) if branchial pendrin immunoreactivity was influenced by environmental salinity. Immunoblots detected pendrin immunoreactivity in Atlantic stingray gills; pendrin immunoreactivity was greatest in freshwater stingrays compared with freshwater stingrays acclimated to seawater (seawater acclimated) and marine stingrays. Using immunohistochemistry, pendrin-positive cells were detected on both gill lamellae and interlamellar regions of freshwater stingrays but were more restricted to interlamellar regions in seawater-acclimated and marine stingray gills. Pendrin immunolabeling in freshwater stingray gills was more apical, discrete, and intense compared with seawater-acclimated and marine stingrays. Regardless of salinity, pendrin immunoreactivity occurred on the apical region of cells rich with basolateral vacuolar-proton-ATPase, and not in Na+-K+-ATPase-rich cells. We suggest that a pendrin-like transporter may contribute to apical Cl−/HCO[Formula: see text] exchange in gills of Atlantic stingrays from both freshwater and marine environments.

Effects of chronic ammonia exposure on growth and food conversion efficiency in juvenile spotted wolffish

Aquaculture ◽  
2003 ◽  
Vol 228 (1-4) ◽  
pp. 215-224 ◽  
Author(s):  
Atle Foss ◽  
Tor H. Evensen ◽  
Tone Vollen ◽  
Victor Øiestad
Keyword(s):  
Conversion Efficiency ◽  
Food Conversion ◽  
Spotted Wolffish ◽  
Ammonia Exposure ◽  
Food Conversion Efficiency
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