Effects of thyroxine administration on plasma thyroxine levels in the goldfish, Carassius auratus L.

1977 ◽  
Vol 55 (1) ◽  
pp. 255-258 ◽  
Author(s):  
Mary E. Hurlburt
Keyword(s):  
Carassius Auratus ◽  
Control Fish ◽  
Goldfish Carassius Auratus ◽  
Treated Fish

Pellet implantation, immersion, or feeding of thyroxine (T4) raised plasma T4 levels above values of control fish (usually less than 1 μg/100 ml). Values for treated fish in the lower dosage groups generally fell between 1 and 4 μg/100 ml, while in the higher dosage groups plasma T4 levels ranged from 5 to 16 μg/100 ml.

Effects of dexamethasone and metopirone on ovulation in the goldfish, Carassius auratus

1977 ◽  
Vol 55 (8) ◽  
pp. 1342-1350 ◽  
Author(s):  
S. Pandey ◽  
T. J. Lam ◽  
Y. Nagahama ◽  
W. S. Hoar
Keyword(s):  
Carassius Auratus ◽  
Histological Analysis ◽  
Nuclear Size ◽  
Dexamethasone Treatment ◽  
Gonadotropin Secretion ◽  
Histological Evidence ◽  
Induced Ovulation ◽  
Goldfish Carassius Auratus ◽  
Treated Fish ◽  
Stimulation Of

At 12 ± 1 °C, a temperature at which goldfish will not ovulate, metopirone induced ovulation in gravid fish. Histological analysis revealed marked stimulation of the pituitary–interrenal axis but did not reveal any change in stainability (granulation) or nuclear size of gonadotrops. It is suggested that metopirone induced ovulation in goldfish by stimulating secretion of 11-deoxycortisol and (or) 11-deoxycorticosterone. Other possibilities are discussed.When the ambient temperature was gradually raised to 20 ± 1 °C, dexamethasone treatment blocked the ovulatory response consistently seen in the saline-injected controls. However, fish injected with human chorionic gonadotropin in addition to dexamethasone ovulated like the saline-injected controls. No change in stainability (granulation) was seen in gonadotrops of dexamethasone-treated fish (20 ± 1 °C) compared to saline-injected and uninjected controls held at 12 ± 1 °C, but marked degranulation was observed in saline-injected fish warmed to 20 ± 1 °C. There appeared to be a reduction of gonadotrope nuclear size in some dexamethasone-treated fish. It is suggested that dexamethasone inhibited ovulation in goldfish by suppressing gonadotropin secretion. Action by way of suppression of corticosteriodogenesis, for which there is good histological evidence, is also discussed, as well as the possibility of direct ovarian action.

Effects of hypoxia, anoxia, and endogenous ethanol on thermoregulation in goldfish, Carassius auratus

2000 ◽  
Vol 278 (3) ◽  
pp. R545-R555 ◽  
Author(s):  
Richard N. Rausch ◽  
Larry I. Crawshaw ◽  
Helen L. Wallace
Keyword(s):  
Carassius Auratus ◽  
Response Pattern ◽  
Threshold Value ◽  
Control Fish ◽  
Similar Response ◽  
Brain Oxygen ◽  
Goldfish Carassius Auratus ◽  
Endogenous Ethanol ◽  
Ambient Oxygen ◽  
Normoxic Control

Effects of hypoxia, anoxia, and endogenous ethanol (EtOH) on selected temperature (Tsel) and activity in goldfish were evaluated. Blood and brain EtOH concentrations ([EtOH]) and brain oxygen partial pressure ([Formula: see text]) were quantified at crucial ambient oxygen pressures. Below a threshold value near 31 Torr, Tsel decreased as a function of environmental[Formula: see text]. Tsel of 15°C-acclimated fish was ∼10°C at the onset of anoxia and changed little over 2 h. Activity showed a similar response pattern. Brain [EtOH] was significantly elevated above control levels after 1 h anoxia. In normoxic water, Tsel remained different in previously anoxic and normoxic control fish for ∼20 min. Blood [EtOH] of previously anoxic fish remained significantly elevated ([EtOH] >4.0 μmol/g blood), and activity was significantly depressed at 20 min. Brain[Formula: see text] reached normal levels in <3 min. We conclude that [EtOH] (brain or blood) and brain[Formula: see text] are not proximal causes of either behavioral anapyrexia (hypothermia) or inactivity in goldfish exposed to oxygen-depleted environments.

Effects of sex steroids on plasma lipids in the goldfish, Carassius auratus

1980 ◽  
Vol 58 (6) ◽  
pp. 967-972 ◽  
Author(s):  
Murray D. Wiegand ◽  
R. E. Peter
Keyword(s):  
Sex Steroids ◽  
Carassius Auratus ◽  
Plasma Lipids ◽  
Plasma Lipid ◽  
Plasma Triglyceride ◽  
Control Fish ◽  
Warm Temperature ◽  
Plasma Total Cholesterol ◽  
Goldfish Carassius Auratus ◽  
Phosphorus Levels

The effects of sex steroids on plasma lipids in female goldfish were studied in sexually regressed and maturing fish at 12 °C, and in recent postovulatory-regressed fish at 21 °C. Intraperitoneal injection of oestrone (E1), but not oestradiol (E2), raised plasma triglyceride (TG) concentrations in regressed fish, but oestrogen had no effect on plasma TG in either maturing fish at 12 °C or in recent postovulatory–regressed fish at 21 °C. Progesterone injection caused high levels of plasma TG in maturing fish at 12 °C. Fish injected with E1or E2 had higher plasma total cholesterol (TC) levels posttreatment compared with control fish in both experiments at 12 °C, but E1 and E2 were without effect on plasma TC at 21 °C. Both E1 and E2 raised plasma lipid phosphorus levels in all three experiments. Testosterone generally had little effect on plasma lipids. These results support the hypothesis that oestrogen is involved in lipid mobilization in teleosts, and it appears that this effect is sensitive to warm temperature. There was no support for a mammalian-like, progesterone-stimulated system for clearance of plasma TG in the female goldfish.

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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