Measurements of serum thyroxine and the proportions of rhodopsin and porphyropsin in rainbow trout

1977 ◽  
Vol 55 (5) ◽  
pp. 836-842 ◽  
Author(s):  
Donald M. Allen
Keyword(s):  
Rainbow Trout ◽  
Visual Pigment ◽  
Salmo Gairdneri ◽  
Serum Thyroxine

Immersion of yearling rainbow trout (Salmo gairdneri) in 0.1 or 1.0 ppm quantities of thyroxine (T4) significantly increased both T4 in the serum and the proportion of porphyropsin visual pigment in the retina. In fish not treated with T4, levels of porphyropsin were higher at 6 °C than at 14 °C. However, under different conditions of light or temperature there was no consistent correlation between serum T4 and percentage of porphyropsin. Furthermore, there was no tendency for individuals higher in porphyropsin to have higher titre of T4, or vice versa. The results generally do not support the hypothesis that serum T4 titre and porphyropsin are physiologically interdependent.

Changes in the visual pigments of trout

1973 ◽  
Vol 51 (9) ◽  
pp. 901-914 ◽  
Author(s):  
Donald M. Allen ◽  
William N. McFarland ◽  
Frederick W. Munz ◽  
Hugh A. Poston
Keyword(s):  
Rainbow Trout ◽  
Brown Trout ◽  
Visual Pigment ◽  
Brook Trout ◽  
Forest Canopy ◽  
Environmental Control ◽  
Cutthroat Trout ◽  
Visual Pigments ◽  
Salmo Gairdneri ◽  
Canopy Access

The proportions of two visual pigments (rhodopsin and porphyropsin) were examined in four species of trout under experimental and natural conditions. Brook trout (Salvelinus fontinalis), rainbow trout (Salmo gairdneri), and brown trout (Salmo trutta) have different relative proportions of visual pigments in their retinae. The visual pigment balance in wild cutthroat trout (Salmo clarki) is related to forest canopy (access to light) and season. The brown trout have a more red-sensitive and less labile pair of visual pigments than brook or rainbow trout, which respond to photic conditions by increasing the proportion of porphyropsin (in light) and increasing rhodopsin (in darkness). The brown trout have a high percentage of porphyropsin, regardless of experimental conditions. This result does not reflect an inability to form rhodopsin but rather may relate to a consistently high proportion of 3-dehydroretinol in the pigment epithelium. The possible advantages and mechanisms of environmental control of trout visual pigment absorbance, as currently understood, are discussed.

Visual pigment changes in the rainbow trout, Salmo gairdneri

1972 ◽  
Vol 50 (8) ◽  
pp. 1117-1126 ◽  
Author(s):  
W. L. Jacquest ◽  
D. D. Beatty
Keyword(s):  
Rainbow Trout ◽  
Visual Pigment ◽  
Intramuscular Injection ◽  
Visual Pigments ◽  
The Other ◽  
Salmo Gairdneri ◽  
Thyrotropic Hormone

The retinae of rainbow trout, Salmo gairdneri, have mixtures of two visual pigments, one based on retinaldehyde (VP5031), the other on 3-dehydroretinaldehyde (VP5272). Increases in the proportion of VP5272 or maintained high percentages of VP5272 were induced in three ways: (1) feeding a diet rich in 3-dehydroretinol; (2) intraperitoneal injections of L-thyroxine; and (3) intramuscular injection of bovine thyrotropic hormone. The possible significance of these findings in relation to carotenoid conversions in fish is discussed.

scholarly journals The Function of Photomechanical Movements in the Retina of the Rainbow Trout (Salmo Gairdneri)

1982 ◽  
Vol 96 (1) ◽  
pp. 389-403 ◽  
Author(s):  
R. H. DOUGLAS
Keyword(s):  
Rainbow Trout ◽  
Dark Adaptation ◽  
Visual Pigment ◽  
Time Course ◽  
Temporal Correlation ◽  
Salmo Gairdneri ◽  
Direct Sunlight ◽  
Pigment Concentrations ◽  
Wave Sensitivity ◽  
Effect Of Light

1. The function of photomechanical movements in the retina of rainbow trout (Salmo gairdneri) was investigated by determining both the effect of light on the level of extractable visual pigment, and the electroretinographic b-wave sensitivity, during various stages of photomechanical light and dark adaptation. 2. Dark-adapted fish, light-adapted fish, and dark-adapted fish exposed to ten minutes direct sunlight had on average visual pigment concentrations of 100, 82 and 36% respectively. 3. The intensity of illumination required to bleach a specified amount of visual pigment in the light-adapted retina was found to be 1.29 log units higher than that needed to bleach the same amount of visual pigment in a dark-adapted eye. 4. The level of extractable visual pigment was observed to be relatively constant over natural twilight periods. 5. A close temporal correlation was observed between the time course of electroretinographic adaptation, measured by the b-wave sensitivity, and photomechanical changes. 6. All these observations tend to support the hypothesis that photomechanical movements serve, at least in part, to protect the rod visual pigment from overstimulation in the light-adapted retina.

Serum estradiol-17β during the preovulatory development of the rainbow trout (Salmo gairdneri)

1985 ◽  
Vol 110 (1_Suppla) ◽  
pp. S163
Author(s):  
R. SCHULZ ◽  
V. BLÜM
Keyword(s):  
Rainbow Trout ◽  
Salmo Gairdneri ◽  
Serum Estradiol ◽  
Estradiol 17Β

STUDIES ON THE HORMONAL CONTROL OF SODIUM METABOLISM IN THE RAINBOW TROUT (SALMO GAIRDNERI)

1959 ◽  
Vol XXXI (IV) ◽  
pp. 587-602 ◽  
Author(s):  
W. N. Holmes
Keyword(s):  
Rainbow Trout ◽  
Hormonal Control ◽  
Salmo Gairdneri ◽  
Sodium Metabolism

Temperature Selection of Rainbow Trout (Salmo gairdneri) Fingerlings in Vertical and Horizontal Gradients

1971 ◽  
Vol 28 (11) ◽  
pp. 1801-1804 ◽  
Author(s):  
R. W. McCauley ◽  
W. L. Pond
Keyword(s):  
Rainbow Trout ◽  
Salmo Gairdneri ◽  
Temperature Preference ◽  
Temperature Selection ◽  
Horizontal Gradients ◽  
Significant Difference ◽  
Preferred Temperatures ◽  
Laboratory Investigations ◽  
Horizontal Temperature Gradients ◽  
Selection Of

Preferred temperatures of underyearling rainbow trout (Salmo gairdneri) were determined in both vertical and horizontal temperature gradients. No statistically significant difference was found between the preferred temperatures by the two different methods. This suggests that the nature of the gradient plays a lesser role than generally believed in laboratory investigations of temperature preference.

scholarly journals The Distribution of 35S-Sulfadiazine and 14G-Trimethoprim in Rainbow Trout, Salmo Gairdneri

1979 ◽  
Vol 20 (1) ◽  
pp. 25-37 ◽  
Author(s):  
Torill Bergsjø ◽  
Inger Nafstad ◽  
Kristian Ingebrigtsen
Keyword(s):  
Rainbow Trout ◽  
Salmo Gairdneri
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