Experimental Observations on the Effects of Predation by Goldfish (Carassius auratus) on the Zooplankton of a Small Saline Lake

1975 ◽  
Vol 32 (9) ◽  
pp. 1589-1594 ◽  
Author(s):  
Chris P. Archibald
Keyword(s):  
Carassius Auratus ◽  
Saline Lake ◽  
Daphnia Pulex ◽  
Fish Predation ◽  
Field Studies ◽  
Minimum Size ◽  
Size Distributions ◽  
Short Term ◽  
Goldfish Carassius Auratus ◽  
Zooplankton Communities

The short-term effects of various intensities offish predation on zooplankton communities were examined. Field studies indicated that fish predation was, as expected, size-selective: in the presence of fish, size distributions of the principal prey, Daphnia pulex, were skewed toward the smaller size-classes and the minimum size of egg-bearing D. pulex was also smaller. Fecundity of Diaptomus ashlandi, and probably also of Daphnia pulex, was greater with fish present. This caused the abundance of these two dominant species to increase initially with increasing predation. Subsequently, the species declined at higher predation levels in order of their interest to fish, with large D. pulex[Formula: see text] declining before small D. pulex (< 1.35 mm) and both groups doing so at lower predation levels than Diaptomus ashlandi.

Effects of short-term starvation on the rhythmic expression of microRNAs in skeletal muscle of goldfish (Carassius auratus )

2017 ◽  
Vol 49 (2) ◽  
pp. 726-737 ◽  
Author(s):  
Ping Wu ◽  
Jun Shi ◽  
Chengyong Yang ◽  
Fangliang Zhang ◽  
Yulong Li ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Carassius Auratus ◽  
Short Term ◽  
Rhythmic Expression ◽  
Goldfish Carassius Auratus

Brain lesions and short-term endocrine effects of monosodium L-glutamate in goldfish, Carassius auratus

1980 ◽  
Vol 212 (3) ◽  
Author(s):  
RichardE. Peter ◽  
Olivier Kah ◽  
ChristineR. Paulencu ◽  
Harry Cook ◽  
AnnL. Kyle
Keyword(s):  
Carassius Auratus ◽  
Brain Lesions ◽  
Endocrine Effects ◽  
Short Term ◽  
Goldfish Carassius Auratus

Anaerobic metabolism in goldfish (Carassius auratus)

1977 ◽  
Vol 55 (8) ◽  
pp. 1304-1311 ◽  
Author(s):  
R. M. Walker ◽  
P. H. Johansen
Keyword(s):  
Carassius Auratus ◽  
Glycogen Phosphorylase ◽  
Anaerobic Metabolism ◽  
Liver Glycogen ◽  
Energy Yield ◽  
Low Oxygen ◽  
Short Term ◽  
Liver Size ◽  
Goldfish Carassius Auratus ◽  
Glycogen Stores

At 20 °C goldfish survive anaerobic conditions for only a few hours while at 4 °C survival is extended to several days. During the course of low-temperature anaerobiosis there was a rise in blood glucose and lactate, a decline in liver glycogen concentration, and an increase in liver water content, while liver size remained constant.The better cold anaerobic survival of winter and hypophysectomized goldfish compared with spring and sham-operated animals was correlated with greater glycogen stores in the livers of the former. It is concluded that liver glycogen is a necessary energy source during cold anaerobiosis, and it is suggested that the resulting hyperglycemia may represent a mechanism to increase glycolytic energy yield. Cold anaerobiosis also resulted in elevated liver glucose-6-phosphatase (EC 3.1.3.9) activity, suggesting an increase in glycogenolysis, but no change in glycogen phosphorylase (EC 2.4.1.1) activity. While cold anaerobic survival is short term it is possible that liver glycogen may sustain goldfish for longer periods at low oxygen levels through a mixed aerobic–anaerobic metabolism.

Short-Term Serum Prolactin Concentrations in Goldfish (Carassius auratus) Subjected to Serial Sampling and Restraint

1976 ◽  
Vol 33 (1) ◽  
pp. 183-186 ◽  
Author(s):  
Richard E. Spieler ◽  
Albert H. Meier
Keyword(s):  
Carassius Auratus ◽  
Marked Decrease ◽  
Circadian Variation ◽  
Serum Prolactin ◽  
Short Term ◽  
Goldfish Carassius Auratus ◽  
Serial Sampling ◽  
The Times ◽  
Initial Capture

Serum prolactin concentrations in serially sampled goldfish (Carassius auratus) did not vary significantly between 30 s and 3 min after initial capture. A marked decrease in prolactin concentration was noted 9–17 min after initial capture followed by a recovery at 30–48 min. Although there was a circadian variation in prolactin concentration, the pattern of response to capture and sampling did not vary significantly among the times tested.

Short-Term Serum Cortisol Concentrations in Goldfish (Carassius auratus) Subjected to Serial Sampling and Restraint

1974 ◽  
Vol 31 (7) ◽  
pp. 1240-1242 ◽  
Author(s):  
Richard E. Spieler
Keyword(s):  
Carassius Auratus ◽  
Serum Cortisol ◽  
Light Period ◽  
Short Term ◽  
Goldfish Carassius Auratus ◽  
Serial Sampling ◽  
Initial Capture

Serum cortisol from serially sampled goldfish (Carassius auratus) did not demonstrate a stress-evoked increase (P >.05) until 10–22 min after initial capture. This response did not differ (P > 0.5) among fish sampled at the beginning, middle, and end of a 12-h light period.

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.

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