Effect of stanniectomy on calcium activated adenosinetriphosphatase activity in the gills of fresh water adapted North American eels, Anguilla rostrata LeSueur

1976 ◽  
Vol 29 (3) ◽  
pp. 383-387 ◽  
Author(s):  
James C. Fenwick
Keyword(s):  
Fresh Water ◽  
North American ◽  
Anguilla Rostrata ◽  
American Eels

The renal handling of calcium and renal Ca2+(Mg2+)-activated adenosinetriphosphatase activity in freshwater- and seawater-acclimated North American eels (Anguilla rostrata LeSueur)

1981 ◽  
Vol 59 (3) ◽  
pp. 478-485 ◽  
Author(s):  
James C. Fenwick
Keyword(s):  
Fresh Water ◽  
North American ◽  
Clearance Rate ◽  
Anguilla Rostrata ◽  
Renal Tubules ◽  
Renal Handling ◽  
Apparent Affinity ◽  
Calcium And Magnesium ◽  
American Eels

In fresh water a small fraction of the calcium filtered across the glomerular apparatus is recovered whereas in seawater the clearance rate of calcium greatly exceeds that of inulin. This indicates a lower translocation of calcium by the renal tubules in fresh water when compared with that in seawater. This increased translocation of calcium in the seawater-acclimated eels was associated with an increase in the activity of renal Ca2+(Mg2+)-ATPase and a decrease in the apparent affinity of the enzyme for calcium. The enzyme was equally stimulated by calcium and magnesium and this may be associated with the fact that in seawater the eel faces a similar problem with regard to each of these ions.

Pigmentation, otolith rings, and upstream migration of juvenile American eels (Anguilla rostrata) in a coastal Rhode Island stream

1991 ◽  
Vol 69 (3) ◽  
pp. 812-814 ◽  
Author(s):  
Alexander J. Haro ◽  
William H. Krueger
Keyword(s):  
Phase Transition ◽  
Fresh Water ◽  
Rhode Island ◽  
Late Summer ◽  
Anguilla Rostrata ◽  
Upstream Migration ◽  
Total Length ◽  
Winter Temperatures ◽  
American Eels ◽  
Yellow Eels

American eels of <250 mm total length were collected in late summer and fall from three stations on the coastal Annaquatucket River. All eels possessed the yellow–green pigmentation characteristic of the yellow phase. Transition of partially pigmented elvers to fully pigmented yellow eels occurred during the summer months following the spring entry into fresh water and was accompanied by significant growth. Mean total length and mean number of annulus-like otolith rings increased significantly with distance upstream, suggesting that elvers migrate a limited distance in the 1st year, but continue on for at least several years thereafter as yellow eels. Upstream progress of eels in this system may be impeded by low winter temperatures, high stream gradient, dams, and impoundments.

Occurrence of American Eels, Anguilla rostrata, in Waters Overlying the Eastern North American Continental Shelf

1973 ◽  
Vol 30 (11) ◽  
pp. 1752-1755 ◽  
Author(s):  
Charles A. Wenner
Keyword(s):  
Continental Shelf ◽  
Chesapeake Bay ◽  
North American ◽  
Cape Cod ◽  
Anguilla Rostrata ◽  
American Eel ◽  
Morphometrical Analysis ◽  
Assateague Island ◽  
American Eels

Eleven reproductively maturing specimens of the American eel, Anguilla rostrata, were collected during three independent off-shore trawling operations. Three females were taken on December 5, 1967 southeast of the mouth of Chesapeake Bay in 10–13 fathoms, one male and one female on November 5, 1969 southeast of Cape Cod in 35–45 fathoms, and six females east of Assateague Island on December 22, 1971 in 5 fathoms. Morphometrical analysis showed that the specimens were within the range of "silver" phase of Anguilla rostrata. Gonadal observations were made on all specimens.

Sign in / Sign up

Export Citation Format

Share Document