Prolactin and Serum Osmolality of Hypophysectomized Killifish, Fundulus heteroclitus, in Fresh-water

Nature ◽  
1966 ◽  
Vol 209 (5027) ◽  
pp. 1040-1041 ◽  
Author(s):  
GRACE E. PICKFORD ◽  
PETER K. T. PANG ◽  
WILBUR H. SAWYER
Keyword(s):  
Fresh Water ◽  
Fundulus Heteroclitus ◽  
Serum Osmolality

Thermal preferences of mummichog, Fundulus heteroclitus L., and banded killifish, F. diaphanus (LeSueur), (Cyprinodontidae) in relation to thermal acclimation and salinity

1977 ◽  
Vol 55 (7) ◽  
pp. 1190-1194 ◽  
Author(s):  
E. T. Garside ◽  
G. C. Morrison
Keyword(s):  
Fresh Water ◽  
Fundulus Heteroclitus ◽  
Sea Water ◽  
Thermal Acclimation ◽  
Thermal Gradients ◽  
Frequency Distributions ◽  
Preferred Temperatures ◽  
Typical Habitat ◽  
Thermal Preferences ◽  
Banded Killifish

Frequency distributions corresponding to various levels of thermal acclimation from 5 to 35 °C were recorded for samples of marine mummichog, Fundulus heteroclitus L., and samples of freshwater banded killifish, F. diaphanus (LeSueur), in thermal gradients formed in columns of fresh water (< 0.5‰ salinity) or sea water (32‰ salinity). Mean preferred temperatures comprised roughly parallel but irregularly inflected trends for the two series of tests, within each species. In mummichog, preferred temperatures for corresponding thermal acclimations ranged from 3 to 6 °C higher in tests conducted in sea water. In banded killifish, preferred temperatures for corresponding thermal acclimations ranged from 5 to 8 °C higher in fresh water. Thus, each species regularly preferred higher temperatures in salinity which approximated that of the typical habitat. The inference to be taken is that the unusual salinity for each species places an extraordinary osmoregulative load which influences the reactions of the fish to the series of thermal or other correlated stimuli in the gradient.

scholarly journals Time course of salinity adaptation in a strongly euryhaline estuarine teleost, fundulus heteroclitus: a multivariable approach

1999 ◽  
Vol 202 (11) ◽  
pp. 1535-1544 ◽  
Author(s):  
W.S. Marshall ◽  
T.R. Emberley ◽  
T.D. Singer ◽  
S.E. Bryson ◽  
S.D. Mccormick
Keyword(s):  
Fresh Water ◽  
Plasma Cortisol ◽  
Time Course ◽  
Fundulus Heteroclitus ◽  
Citrate Synthase ◽  
Sea Water ◽  
Short Circuit ◽  
Secretion Rate ◽  
Ion Secretion ◽  
Cortisol Levels

Freshwater-adapted killifish (Fundulus heteroclitus) were transferred directly from soft fresh water to full-strength sea water for periods of 1 h, 3 h, 8 h and 1, 2, 7, 14 and 30 days. Controls were transferred to fresh water for 24 h. Measured variables included: blood [Na+], osmolality, glucose and cortisol levels, basal and stimulated rates of ion transport and permeability of in vitro opercular epithelium, gill Na+/K+-ATPase and citrate synthase activity and chloride cell ultrastructure. These data were compared with previously published killifish cystic fibrosis transmembrane conductance regulator (kfCFTR) expression in the gills measured over a similar time course. Plasma cortisol levels peaked at 1 h, coincident with a rise in plasma [Na+]. At 8 h after transfer to sea water, a time at which previous work has shown kfCFTR expression to be elevated, blood osmolality and [Na+] were high, and cortisol levels and opercular membrane short-circuit current (Isc; a measure of Cl- secretion rate) were low. The 24 h group, which showed the highest level of kfCFTR expression, had the highest plasma [Na+] and osmolality, elevated plasma cortisol levels, significantly lower opercular membrane resistance, an increased opercular membrane ion secretion rate and collapsed tubule inclusions in mitochondria-rich cells, but no change in gill Na+/K+-ATPase and citrate synthase activity or plasma glucose levels. Apparently, killifish have a rapid (&lt;1 h) cortisol response to salinity coupled to subsequent (8–48 h) expression of kfCFTR anion channel proteins in existing mitochondria-rich cells that convert transport from ion uptake to ion secretion.

Influence of osmotic stress on upper lethal temperatures in the cyprinodontid fish Fundulus heteroclitus (L.)

1972 ◽  
Vol 50 (6) ◽  
pp. 787-791 ◽  
Author(s):  
E. T. Garside ◽  
Z. K. Chin-Yuen-Kee
Keyword(s):  
Thermal Stress ◽  
Osmotic Stress ◽  
Fresh Water ◽  
Thermal Tolerance ◽  
Fundulus Heteroclitus ◽  
Thermal Acclimation ◽  
Lethal Temperature ◽  
Lethal Temperatures

Upper lethal temperatures determined for the mummichog Fundulus heteroclitus (L.) for exposures of 10 000 min ranged from 18.58C to 36.31C. Osmotic acclimations were prepared at 0, 14, and 32‰ salinity (S), at thermal acclimations of 5 and 15C, and at 14 and 32‰ S at 25C. Mummichog could not survive in the acclimatory combination of 0‰ S at 25C. Subsamples from these acclimatory combinations were exposed to thermal stress at 0, 14, and 32‰ S. Highest upper lethal temperatures were observed in isosmotic test salinity (14‰). Intermediate lethal levels occurred in seawater (32‰ S) and the lowest lethal temperatures occurred in fresh water (0‰ S). Upper lethal temperature increased with increasing thermal acclimation but generally, prior osmotic experience did not modify thermal tolerance. There was no relation between order of death and size in 18 of the 24 test combinations. In the remaining six, the largest members died first in four and the smallest died first in two test combinations.

Ca2+ transport by opercular epithelium of the fresh water adapted euryhaline teleost, Fundulus heteroclitus

1995 ◽  
Vol 165 (4) ◽  
pp. 268-277 ◽  
Author(s):  
W. S. Marshall ◽  
S. E. Bryson ◽  
J. S. Burghardt ◽  
P. M. Verbost
Keyword(s):  
Fresh Water ◽  
Fundulus Heteroclitus ◽  
Euryhaline Teleost

Characterization of ion and acid-base transport in the fresh water adapted mummichog (Fundulus heteroclitus)

1997 ◽  
Vol 279 (3) ◽  
pp. 208-219 ◽  
Author(s):  
Marjorie L. Patrick ◽  
Peter Pärt ◽  
William S. Marshall ◽  
Chris M. Wood
Keyword(s):  
Fresh Water ◽  
Fundulus Heteroclitus ◽  
Acid Base
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