Feeding of Rainbow Trout (Salmo gairdneri) and Arroyo Chubs (Gila orcutti) in a California Mountain Stream

1986 ◽  
Vol 31 (2) ◽  
pp. 250 ◽  
Author(s):  
Carl Richards ◽  
David L. Soltz
Keyword(s):  
Rainbow Trout ◽  
Salmo Gairdneri ◽  
Mountain Stream

Night Feeding of Brown and Rainbow Trout in an Experimental Stream Channel

1969 ◽  
Vol 26 (12) ◽  
pp. 3275-3278 ◽  
Author(s):  
Thomas M. Jenkins Jr.
Keyword(s):  
Rainbow Trout ◽  
Salmo Trutta ◽  
Salmo Gairdneri ◽  
Mountain Stream ◽  
Stream Channel ◽  
Fish Feeding ◽  
Feeding Tubes ◽  
Night Feeding ◽  
Terrestrial Insects ◽  
Experimental Stream

This study sought to determine if stream-living brown and rainbow trout (Salmo trutta and Salmo gairdneri) will feed on drifting terrestrial insects at night. Groups of fish were confined in segments of a rocky-substrate mountain stream, and marked ants were introduced to the current from observation towers equipped with feeding tubes. After the last introductions of an experiment, the fish were removed and their stomachs were examined for marked ants.Although fish of both species fed at night, they appeared to take a smaller percentage of the ants provided than did day-feeding groups studied for comparison. Fish feeding under bright moonlight and starlight captured introduced ants at about the same rates. The results suggest that trout in the type of stream studied feed or are in feeding readiness at nearly all hours of the day or night, at least in the summer months.

An Estimate of Energy Expenditure by Rainbow Trout (Salmo gairdneri) in a Small Mountain Stream

1973 ◽  
Vol 30 (11) ◽  
pp. 1755-1759 ◽  
Author(s):  
C. Robert Feldmeth ◽  
Thomas M. Jenkins Jr.
Keyword(s):  
Rainbow Trout ◽  
Energy Expenditure ◽  
Beat Frequency ◽  
Live Weight ◽  
Time Of Day ◽  
Salmo Gairdneri ◽  
Mountain Stream ◽  
Natural Food ◽  
Published Data ◽  
Natural Stream

A method is presented which estimates energy expended by rainbow trout (Salmo gairdneri) in a natural stream habitat. Swimming speeds were determined by counting caudal fin beat frequency in the field. Published data on metabolic rates estimated in a water tunnel respirometer were then used to calculate energy expenditure.Swimming speeds and hence energy expenditure did not vary statistically for time of day or night (overall means: swimming speed, 16.1 cm/sec; energy expenditure, 736.5 cal/kg per hour). Our calculations indicate that swimming at 16 cm/sec would cost a 100-g rainbow trout 53 cal/hr at 15 C, and about 0.48 g (live weight) of natural food per 6 hr would be needed to offset the cost of swimming.

Feeding of Rainbow Trout (Salmo gairdneri) in Relation to Abundance of Drifting Invertebrates in a Mountain Stream

1970 ◽  
Vol 27 (12) ◽  
pp. 2356-2361 ◽  
Author(s):  
T. M. Jenkins Jr. ◽  
G. V. Elliott ◽  
C. R. Feldmeth
Keyword(s):  
Rainbow Trout ◽  
Salmo Gairdneri ◽  
Mountain Stream ◽  
Benthic Insects ◽  
Important Prey ◽  
Night Feeding ◽  
Generally True

Hatchery-reared rainbow trout, deprived of food for 48 or 96 hr and released in a mountain stream for 5- or 10-hr periods, consumed aerial invertebrates in numbers loosely associated with their seasonal and hourly abundance in the drift. The same was generally true for benthic insects, except that on several days feeding was much poorer relative to drift from 3:00 AM to 8:00 AM than at other times of day.In September and October tests, aerial forms were abundant during daylight, and benthic forms abundant at night, enabling trout to feed 24 hr a day. Day and night feeding in September were roughly equal in importance, but in October more food was taken during the day. Aerial invertebrates were so rare in December that benthic insects were the most important prey day and night. However, even benthics were not numerous enough to provide good feeding.

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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