Studies on the comparative efficiency of utilization of gross energy from some carbohydrates, proteins and fats by rainbow trout (Salmo gairdneri, R.)

Aquaculture ◽  
1980 ◽  
Vol 20 (4) ◽  
pp. 323-332 ◽  
Author(s):  
A. Pieper ◽  
E. Pfeffer
Keyword(s):  
Rainbow Trout ◽  
Salmo Gairdneri ◽  
Comparative Efficiency ◽  
Gross Energy

Apparent Digestibility in Rainbow Trout (Salmo Gairdneri): Influence of Hypoxia

1988 ◽  
Vol 45 (11) ◽  
pp. 2003-2009 ◽  
Author(s):  
T. Pouliot ◽  
J. de la Noüe
Keyword(s):  
Rainbow Trout ◽  
Feed Intake ◽  
Animal Protein ◽  
Control Fish ◽  
Salmo Gairdneri ◽  
Apparent Digestibility ◽  
Oxygen Saturation Level ◽  
Gross Energy ◽  
Isocaloric Diets ◽  
Different Sources

We assessed the influence of hypoxia, which is likely to reduce the productivity of fish culture, on the digestibility of nutrients in rainbow trout (Salmo gairdneri). Rainbow trout (seven to each diet) were kept for 8 d in water with an oxygen saturation level of 40.0 ± 4.0%, while control fish were kept in 89.4 ± 4.2% oxygen-saturated water. Three isonitrogenous and isocaloric diets composed of different sources of protein (animal, plant, and mixed) were used. The apparent digestibility coefficients (ADC) were calculated by the indirect method (chromic oxide) after the automatic collection of feces. The experimental hypoxia used did not change the ADC for protein (total nitrogen), gross energy, or dry matter. The amino acids only showed a tendency for better absorption: proline, glycine, alanine, and tryptophan had a significantly higher ADC (P < 0.05) in experimental fish than in control fish when the animal protein based diet was used. Finally, we noted that feed intake was diet dependent. In contrast with what we observed with the commercial (mixed protein sources) and plant protein based diets, the fish receiving the animal protein based diet maintained a normal (or returning to normal) feed intake when they were subjected to hypoxia.

Evaluation of Acid-Insoluble Ash as an Indicator of Feed Digestibility in Rainbow Trout (Salmo gairdneri)

1984 ◽  
Vol 41 (9) ◽  
pp. 1384-1386 ◽  
Author(s):  
J. L. Atkinson ◽  
J. W. Hilton ◽  
S. J. Slinger
Keyword(s):  
Rainbow Trout ◽  
Crude Protein ◽  
Dry Matter ◽  
Ash Content ◽  
Chromic Oxide ◽  
Salmo Gairdneri ◽  
Natural Occurrence ◽  
Feed Digestibility ◽  
Gross Energy ◽  
Dietary Acid

Relative performances of dietary acid-insoluble ash, celite (a source of acid-insoluble ash), and chromic oxide as digestibility references were compared. Apparent digestibilities of dry matter, crude protein, and gross energy in a practical diet fed to rainbow trout (Salmo gairdneri) were similar regardless of indicator used. Acid-insoluble ash can bean effective indicator for digestibility trials with fish. Its natural occurrence in fish foods and feedstuffs and ease of analysis make it preferable to added indicators, such as chromic oxide, in many circumstances. When the acid-insoluble ash content of a diet is low, the addition of celite can improve the precision of the analysis without affecting absolute values of digestibility coefficients.

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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