Diel variations in circulating levels of triiodothyronine and thyroxine in goldfish, Carassius auratus

1979 ◽  
Vol 57 (3) ◽  
pp. 665-669 ◽  
Author(s):  
Richard E. Spieler ◽  
Teresa A. Noeske
Keyword(s):  
Carassius Auratus ◽  
Time Of Day ◽  
Apparent Effect ◽  
Light Onset ◽  
Goldfish Carassius Auratus ◽  
Diel Variations ◽  
Circulating Levels

Goldfish maintained on a 12 h light: 12 h dark photoperiod (light onset 0800 hours) and sampled at one of six different times of day had significant differences in both serum triiodothyronine (T3) and thyroxine (T4) levels depending on the time of day of sampling. Hormone titers were determined by commercial radioimmunoassay kits. Maximum levels for T3 and T4 occurred at 1600 hours; minimum levels occurred during the 4 h preceding the onset of light (0400- and 0800-hour samples). There was no apparent effect of sampling stress (< 15 min) on titers of T3 and T4.

Stress and adrenocorticosteroid dynamics in the goldfish, Carassius auratus

1975 ◽  
Vol 53 (8) ◽  
pp. 1012-1020 ◽  
Author(s):  
James N. Fryer
Keyword(s):  
Significant Variation ◽  
Carassius Auratus ◽  
Dark Period ◽  
Serum Cortisol ◽  
Light Period ◽  
Sham Injection ◽  
Goldfish Carassius Auratus ◽  
Competitive Protein Binding ◽  
Two Peaks ◽  
Circulating Levels

In goldfish serum, cortisol was found to constitute 77.6% of the adrenocorticosteroids measured by a competitive protein-binding radioassay. Adult goldfish maintained on a photoperiod of 14 h light: 10 h dark in November exhibited no significant variation in serum corticosteroid concentration throughout the 24-h cycle. Goldfish maintained in an 8L:16D photoperiod in June exhibited two peaks in serum adrenocorticosteroid concentration. Four hours before the onset of the light period and 4 h after the onset of the light period, serum corticosteroids were significantly higher than those observed at the midpoint of the dark period. After sham injection, swimming in shallow water, or a thermal shock, but not a handling disturbance, circulating levels of corticosteroids were significantly higher than in undisturbed fish. Betamethasone injected 24 h before a thermal stress completely blocked the stress-induced increase in serum corticosteroids observed in vehicle-injected and uninjected goldfish, demonstrating the potency of this steroid as a blocker of the pituitary–interrenal axis in this species.

Uptake, distribution, and turnover of catecholamine radiolabel in the goldfish, Carassius auratus L.

1977 ◽  
Vol 55 (10) ◽  
pp. 1656-1670 ◽  
Author(s):  
Greg P. Busacker ◽  
Walter Chavin
Keyword(s):  
Adipose Tissue ◽  
Blood Brain Barrier ◽  
Carassius Auratus ◽  
Handling Stress ◽  
Transient Event ◽  
Goldfish Carassius Auratus ◽  
Short Period ◽  
Mammalian Tissues ◽  
Circulating Levels

As the uptake, distribution, and turnover of epinephrine and norepinephrine are largely unknown in teleosts, the relative tissue affinities for these circulating catecholamines were evaluated in the goldfish, Carassius auratus L. Since sufficient circulating levels of catecholamines available for uptake by tissues in vivo are a transient event occurring after stress, it was decided to investigate the uptake and decline of radiolabeled catecholamines over a short period of time, noting that uptake would coincide with high endogenous levels from handling stress while decline would be unaffected by stress. Fish injected with l-[3H]norepinephrine and dl-[carbinol-14C]epinephrine were killed from 0.5 to 1024 min postinjection, and the catecholamine radiolabels determined in 19 tissues. Six different uptake and retention patterns for individual tissues were present, but all tissues examined showed preference for the norepinephrine radiolabel. Among the excretory mechanisms in the goldfish, the liver is prominent in catecholamine elimination via the bile. A blood–brain barrier appears present for epinephrine, but not for norepinephrine; epinephrine is excluded from the hypothalamus and pituitary. Further, adipose tissue takes up only norepinephrine. In some teleostean tissues, therefore, the two catecholamines are handled differently than in the comparable mammalian tissues.

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

Toxicity and deleterious impacts of selenium nanoparticles at supranutritional and imbalance levels on male goldfish (Carassius auratus) sperm

2021 ◽  
Vol 66 ◽  
pp. 126758
Author(s):  
Javad Seyedi ◽  
Mohammad Reza Kalbassi ◽  
Milad Esmaeilbeigi ◽  
Mohammad Behzadi Tayemeh ◽  
Jamshid Amiri Moghadam
Keyword(s):  
Carassius Auratus ◽  
Selenium Nanoparticles ◽  
Goldfish Carassius Auratus
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