Further Observations on the Response of Rainbow Trout, Salmo gairdneri, to Overhead Light

1969 ◽  
Vol 26 (12) ◽  
pp. 3233-3237 ◽  
Author(s):  
Wen-hwa Kwain ◽  
Hugh R. MacCrimmon
Keyword(s):  
Rainbow Trout ◽  
Salmo Gairdneri ◽  
Artificial Light ◽  
Significant Preference ◽  
Minimum Light ◽  
Light Minimum ◽  
Overhead Light

The response of rainbow trout (Salmo gairdneri Richardson) to overhead light changed with the growth of the fish. No response was evident until the age of 7 months, after which the response became more pronounced with age. Trout exhibited a significant preference for the darkest chamber when given a choice of five intensities of artificial light. Minimum light threshold for 10-month-old fish was between 0.01 and 0.005 lux. However, 24-month-old fish had a lower level of light threshold between 0.005 and 0.001 lux.

Influence of light on early development and meristic characters in the rainbow trout, Salmo gairdneri Richardson

1969 ◽  
Vol 47 (4) ◽  
pp. 631-637 ◽  
Author(s):  
H. R. MacCrimmon ◽  
Wen-Hwa Kwain
Keyword(s):  
Rainbow Trout ◽  
Light Intensity ◽  
Metabolic Rate ◽  
Early Development ◽  
Salmo Gairdneri ◽  
Artificial Light ◽  
Meristic Characters ◽  
Fin Rays ◽  
Test Light ◽  
Pelvic Fin

Initial mortality of newly fertilized rainbow trout eggs incubated in artificial light increased with intensity. The mortality among eyed eggs exposed to the same set of conditions was comparatively low regardless of intensity. Mortality, time to hatch, metabolic rate, and the number of vertebrae formed correlated positively with visible light intensity but only during the pre-eyed stage of incubation. By contrast, the numbers of dorsal and anal fin rays were affected by light intensity during the posteyed incubation period, the greatest number of rays on these fins occurring in fish incubated at light intensity of 10 lux. The numbers of pectoral and pelvic fin rays were constant at all test light intensities. Further research is imperative if the importance of light as an environmental factor in the early development of fish is to be understood.

Age and Vision as Factors in Bottom Colour Selection by Rainbow Trout, Salmo gairdneri

1969 ◽  
Vol 26 (3) ◽  
pp. 687-693 ◽  
Author(s):  
Wen-hwa Kwain ◽  
Hugh R. MacCrimmon
Keyword(s):  
Rainbow Trout ◽  
Light Intensity ◽  
Visible Light ◽  
Total Darkness ◽  
Salmo Gairdneri ◽  
Colour Discrimination ◽  
Significant Preference ◽  
Light Intensities ◽  
Behavioural Patterns ◽  
Normal Fish

Rainbow trout exposed in a circular tank to a choice of black or white bottom at a light intensity of 10−2 lux were randomly distributed until the age of 14 months at which time a significant preference for black began and became more pronounced with increasing age.Groups of fish (18–24 months of age) with normal eyes, without eye lenses, and lacking eyes, were held in total darkness and at 10−2, 10, and 200 lux. In total darkness all groups were randomly distributed and quiescent. Fish without eye lenses selected black at all visible light intensities and acted similarly to normal fish at 10−2 lux. Fish lacking eyes were randomly distributed and more-or-less inactive at all intensities.The eye is essential for bottom colour discrimination and behavioural patterns occurring in normal trout exposed to different light intensities.

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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