scholarly journals Experimental investigations on the toxicity of ammonia: effects on ventilation frequency, growth, epidermal mucous cells, and gill structure of rainbow trout Salmo gairdneri

1987 ◽  
Vol 3 ◽  
pp. 159-165 ◽  
Author(s):  
T Lang ◽  
G Peters ◽  
R Hoffmann ◽  
E Meyer
Keyword(s):  
Rainbow Trout ◽  
Salmo Gairdneri ◽  
Experimental Investigations ◽  
Mucous Cells ◽  
Ventilation Frequency ◽  
Gill Structure

Morphological Changes in Gill Epithelia of Heat-Stressed Rainbow Trout, Salmo gairdneri: Evidence in Support of a Temperature-Induced Surface Area Change Hypothesis

1981 ◽  
Vol 38 (1) ◽  
pp. 16-22 ◽  
Author(s):  
Dan Jacobs ◽  
Edward F. Esmond ◽  
Edward L. Melisky ◽  
Charles H. Hocutt
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Rainbow Trout ◽  
Morphological Changes ◽  
Salmo Gairdneri ◽  
Mucus Production ◽  
Secondary Lamellae ◽  
Gill Structure ◽  
Surface Area Change ◽  
Scanning Electron

Surface morphology of the gill structure of hatchery-reared rainbow trout (Salmo gairdneri) exposed to heat shock was examined by scanning electron microscopy. Changes were greatest in fish previously acclimated to 6 °C and exposed to 24 or 30 °C water for 3–5 d. Gill epithelia of heat-stressed fish showed a reduction and loss of the microridge patterns. The surface of the efferent arterial sides of the primary lamellae became irregular and rugose, and fusion of the secondary lamellae occurred at higher temperatures. The morphological changes along with an increase in mucus production may be a major factor in causing hypoxia in heat-stressed fish.Key words: gill epithelium, rainbow trout, primary lamellae, secondary lamellae, temperature, heat stress, scanning electron microscopy

Histogenesis of the oropharyngeal and oesophageal mucosa as related to early feeding in rainbow trout, Salmo gairdneri Richardson

1977 ◽  
Vol 55 (1) ◽  
pp. 116-128 ◽  
Author(s):  
Timothy K. Twongo ◽  
Hugh R. MacCrimmon
Keyword(s):  
Rainbow Trout ◽  
Epithelial Cell ◽  
Alimentary Canal ◽  
Taste Buds ◽  
Salmo Gairdneri ◽  
Mucous Cells ◽  
Early Feeding ◽  
First Feeding ◽  
Oesophageal Mucosa ◽  
Epithelial Layers

The histogenesis of the oropharyngeal and oesophageal mucosa of rainbow trout, Salmo gairdneri, eleutheroembryos was studied from hatching to day 40 in relation to early feeding. Numbers of epithelial layers of the mucosa increased appreciably until day 20 but little thereafter. Differentiation of mucous cells was evident by day 10 and increased rapidly in number until about day 20. The first structurally distinct taste buds were observed in the oropharyngeal mucosa at day 8 and appeared by day 20 to be fully differentiated. An epithelial cell plug that occluded the upper alimentary canal and would have prevented passage of food into the stomach disappeared at about day 17. Teeth, although developing under the mucosa by day 3, had not yet erupted at day 22, the time of first feeding.It is suggested that the onset of first feeding in rainbow trout is in synchrony with the histogenesis of the oropharyngeal mucosa, notably the mucous cells and taste buds. The oropharyngeal mucosa of the fish that failed to feed by day 37 appeared to have undergone extensive hyperplasia while mucous cells were atypical, and taste buds seemingly deformed.

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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