The temperature selection of small hypophysectomized goldfish (Carassius auratus L.)

1970 ◽  
Vol 48 (2) ◽  
pp. 323-326 ◽  
Author(s):  
A. W. Roy ◽  
P. H. Johansen
Keyword(s):  
Temperature Gradient ◽  
Carassius Auratus ◽  
Horizontal Temperature Gradient ◽  
Temperature Selection ◽  
Goldfish Carassius Auratus ◽  
Temperature Ranges ◽  
Selection Of

The selected temperature ranges of unoperated, sham-operated, and hypophysectomized goldfish were determined in a horizontal temperature gradient. Hypophysectomy did not alter the selected temperature of small goldfish.

THE EFFECT OF AGE ON TEMPERATURE SELECTION BY LABORATORY MICE (MUS MUSCULUS)

1966 ◽  
Vol 44 (4) ◽  
pp. 511-517 ◽  
Author(s):  
D. M. Ogilvie ◽  
R. H. Stinson
Keyword(s):  
Temperature Gradient ◽  
Mus Musculus ◽  
Selection Response ◽  
Laboratory Mice ◽  
Horizontal Temperature Gradient ◽  
Temperature Selection ◽  
Adult Level ◽  
Level Of Selection ◽  
High Level ◽  
Effect Of Age

Adult animals have been used for most of the previous mammalian temperature selection studies, and relatively few systematic observations have been made with young animals. In this investigation, laboratory mice (Mus musculus), ranging in age from 1 to 84 days, were studied in a horizontal temperature gradient established along a 5-ft copper bar. Despite poorly developed locomotion and cold immobilization, it was shown that the temperature selection response is present at birth. The initially high level of selection appeared to be maintained for about 2 weeks, after which it began to decrease, rapidly at first, and then more slowly until the adult level was reached.

The effect of ethanol on temperature selection in the goldfish, Carassius auratus

1988 ◽  
Vol 29 (2) ◽  
pp. 243-248 ◽  
Author(s):  
C.S. O'Connor ◽  
L.I. Crawshaw ◽  
R.C. Bedichek ◽  
J.C. Crabbe
Keyword(s):  
Carassius Auratus ◽  
Temperature Selection ◽  
Goldfish Carassius Auratus

Thermoregulatory effects of intracranial norepinephrine injections in goldfish

1987 ◽  
Vol 253 (6) ◽  
pp. R821-R826 ◽  
Author(s):  
L. P. Wollmuth ◽  
L. I. Crawshaw ◽  
H. Panayiotides-Djaferis
Keyword(s):  
Tartaric Acid ◽  
Thermal Gradient ◽  
Carassius Auratus ◽  
Behavioral Thermoregulation ◽  
Goldfish Carassius Auratus ◽  
Anterior Aspect ◽  
Intraventricular Injections ◽  
Site Of Action ◽  
Dose Dependent ◽  
Selection Of

Cannulas were implanted into forebrain loci of goldfish (Carassius auratus; 45-90 g) to determine the effects and site of action of intracranial norepinephrine (NE) injections on behavioral thermoregulation. Following 30 min in a thermal gradient, implanted fish were injected with norepinephrine-bitartrate salt (2.5-500 ng NE) in 0.2 microliter 0.7% NaCl. Injections of 5, 10, 25, and 50 ng NE into the anterior aspect of the nucleus preopticus periventricularis (NPP, Ref. 25) led to consistent dose-dependent decreases in selected temperature (Tsel). No effect on Tsel was observed following injections of 2.5 ng NE or control injections of 100 ng tartaric acid. The effects of injections into other loci, including intraventricular injections, were dependent on the dose and proximity to the anterior NPP; at sites adjacent to the anterior NPP, larger doses were required, and the effects became inconsistent. At sites further removed, no effect on Tsel was observed. Included in this category were more caudal sites within the NPP and the nucleus preopticus. We postulate that in fish the anterior NPP is an important locus for thermoregulatory integration and that increased release of NE in this area leads to the selection of cooler water.

SEM of Hepatocytes and Biliary Passages in Goldfish Liver

1977 ◽  
Vol 35 ◽  
pp. 556-557
Author(s):  
Waykin Nopanitaya ◽  
Joe W. Grisham ◽  
Johnny L. Carson
Keyword(s):  
Carassius Auratus ◽  
Cell Layer ◽  
Three Dimensional ◽  
Cell Types ◽  
Biliary System ◽  
Fish Food ◽  
Commercial Fish ◽  
Goldfish Carassius Auratus ◽  
Commercial Fish Food

An interesting feature of the goldfish liver is the morphology of the hepatic plate, which is always formed by a two-cell layer of hepatocytes. Hepatic plates of the goldfish liver contain an infrequently seen second type of cell, in the centers of plates between two hepatocytes. A TEH study by Yamamoto (1) demonstrated ultrastructural differences between hepatocytes and centrally located cells in hepatic plates; the latter were classified as ductule cells of the biliary system. None of the previous studies clearly showed a three-dimensional organization of the two cell types described. In the present investigation we utilize SEM to elucidate the arrangement of hepatocytes and bile ductular cells in intralobular plates of goldfish liver.Livers from young goldfish (Carassius auratus), about 6-10 cm, fed commercial fish food were used for this study. Hepatic samples were fixed in 4% buffered paraformaldehyde, cut into pieces, fractured, osmicated, CPD, mounted Au-Pd coated, and viewed by SEM at 17-20 kV. Our observations were confined to the ultrastructure of biliary passages within intralobular plates, ductule cells, and hepatocytes.

Induction of Gynogenesis and Androgenesis in Goldfish Carassius auratus (var. oranda)

2001 ◽  
Vol 36 (3-4) ◽  
pp. 195-198 ◽  
Author(s):  
I Paschos ◽  
L Natsis ◽  
C Nathanailides ◽  
I Kagalou ◽  
E Kolettas
Keyword(s):  
Carassius Auratus ◽  
Goldfish Carassius Auratus
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