Transient occurrence of chloride cells in the abdominal epidermis of the guppy, Poecilia reticulata Peters, adapted to sea water

1978 ◽  
Vol 191 (3) ◽  
Author(s):  
WalterK. Schwerdtfeger ◽  
J�rgen Bereiter-Hahn
Keyword(s):  
Poecilia Reticulata ◽  
Sea Water ◽  
Chloride Cells

Ultrastructure and distribution dynamics of chloride cells in tilapia larvae in fresh water and sea water

1999 ◽  
Vol 297 (1) ◽  
pp. 119-130 ◽  
Author(s):  
A. J. H. van der Heijden ◽  
J. C. A. van der Meij ◽  
G. Flik ◽  
S. E. Wendelaar Bonga
Keyword(s):  
Fresh Water ◽  
Sea Water ◽  
Chloride Cells ◽  
Distribution Dynamics

scholarly journals Difference in Osmoregulatory Function in Sea Water among Strains of the Guppy Poecilia reticulata

1997 ◽  
Vol 63 (1) ◽  
pp. 69-72 ◽  
Author(s):  
Takahito Shikano ◽  
Masamichi Nakajima ◽  
Yoshihisa Fujio
Keyword(s):  
Poecilia Reticulata ◽  
Sea Water ◽  
Osmoregulatory Function

A light microscopic study of the action of sodium orthovanadate on the gills of fresh-water and sea-water eels (Anguilla anguilla L.)

1979 ◽  
Vol 59 (4) ◽  
pp. 859-865 ◽  
Author(s):  
K. F. Kelly ◽  
B. J. S. Pirie ◽  
M. V. Bell ◽  
J. R. Sargent
Keyword(s):  
Light Microscopy ◽  
Fresh Water ◽  
Constant Pressure ◽  
Sea Water ◽  
Anguilla Anguilla ◽  
Chloride Cells ◽  
Sodium Orthovanadate ◽  
Central Venous ◽  
Water Fish ◽  
Gill Filaments

Gills of fresh-water and sea-water eels were perfused at a constant pressure with physiological Ringer containing 10−6 M sodium orthovanadate and examined by light microscopy. The secondary gill filaments were markedly vasoconstricted in both freshwater and sea-water fish although the peripheral blood route around the secondary filaments was unaffected. The central venous space in the primary filament was largely unaffected. Significant constriction of both afferent and efferent arteries on the primary filament occurred. We conclude that orthovanadate vasoconstricts eel gills mainly at the level of the secondary filaments. The study also emphasizes that chloride cells are located on both the primary and secondary filaments of fresh-water gills but solely on the primary filaments of sea-water gills.

Differences in Measurements of Smolt Development Between Wild and Hatchery-Reared Juvenile Coho Salmon (Oncorhynchus kisutch) Before and After Saltwater Exposure

1994 ◽  
Vol 51 (10) ◽  
pp. 2170-2178 ◽  
Author(s):  
J. Mark Shrimpton ◽  
Nicholas J. Bernier ◽  
George K. Iwama ◽  
David J. Randall
Keyword(s):  
Citrate Synthase ◽  
Coho Salmon ◽  
Sea Water ◽  
Salt Water ◽  
Oncorhynchus Kisutch ◽  
Sodium Concentration ◽  
Chloride Cells ◽  
Plasma Sodium ◽  
Hatchery Fish ◽  
Saltwater Tolerance

We compared the saltwater tolerance of coho salmon (Oncorhynchus kisutch) juveniles that were reared in different environments. The groups examined consisted of fish reared exclusively in the hatchery, a hatchery group transplanted into the upper watershed of the river (colonized), and wild fish from natural spawning broodstock in the river. Although hatchery fish were much larger than their wild or colonized counterparts, they consistently showed a reduced saltwater tolerance as assessed by a much greater perturbation in plasma sodium concentration following transfer to salt water. Within each group there was no relationship between size of the fish and saltwater tolerance. Following transfer to sea water, hatchery fish showed a significant decline in haematocrit and a significant increase in circulating plasma cortisol concentration. Neither of these changes was seen in wild smolts. Hatchery fish possessed fewer chloride cells, and lower specific activities of the enzymes Na+K+ATPase and citrate synthase. The weaker osmoregulatory ability of hatchery fish led to a greater mortality following abrupt transfer to 35‰ seawater. We believe that the differences in saltwater tolerance seen among the different groups of fish are due to rearing environment.

Angiotensin II receptors in the gill of sea water- and freshwater-adapted eel

1997 ◽  
Vol 18 (1) ◽  
pp. 67-76 ◽  
Author(s):  
S Marsigliante ◽  
A Muscella ◽  
G P Vinson ◽  
C Storelli
Keyword(s):  
Image Analysis ◽  
Angiotensin Ii ◽  
Atpase Activity ◽  
Sea Water ◽  
Anguilla Anguilla ◽  
Chloride Cell ◽  
Chloride Cells ◽  
Angiotensin Ii Receptors ◽  
Receptor Subtypes ◽  
Ang Ii

ABSTRACT Immunocytochemistry of paraffin-embedded and cryostat sections of eel (Anguilla anguilla) gill showed that angiotensin II receptors (Ang II-R) were present in chloride cells, uniformly distributed in the cytoplasm and on surface membranes. Computerised image analysis of these preparations showed that gills from sea water (SW)-adapted animals had a significantly (3-fold) higher Ang II-R concentration compared with freshwater (FW)-adapted eel gills. Isoelectric focusing gel electrophoresis revealed two Ang II-R isoforms with pI 6·5 and 6·6 that were differentially modulated by environmental salinity: they were equally abundant in SW while in FW the pI 6·6/pI 6·5 ratio was 1·66. Using catalytic cytochemistry with image analysis, gill chloride cell membrane Na+/K+ATPase activity was shown to increase 4-fold in response to SW adaptation. Additionally, perfusion of gills for 30 min with 0·1, 10 or with 100 nM Ang II provoked a dose-dependent increment in Na+/K+ATPase activity in FW, and a biphasic response in SW gills in which activity was significantly increased at low Ang II concentrations but was reduced to basal values at 100 nM. The data suggest that adaptation to sea water significantly increases Ang II-R concentration in the chloride cell and, together with the effects of Ang II on Na+/K+ATPase activity, suggest a role for this hormone in gill NaCl retention. The different responses of Na+/K+ATPase to Ang II stimulation in FW and SW may be attributed to the presence of two receptor subtypes that are differently modulated by salinity and that have opposing effects on Na+/K+ATPase.

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