Effects of Age and Overhead Illumination on Temperatures Preferred by Underyearling Rainbow Trout, Salmo gairdneri, in a Vertical Temperature Gradient

1978 ◽  
Vol 35 (11) ◽  
pp. 1430-1433 ◽  
Author(s):  
Wen-Hwa Kwain ◽  
Robert W. McCauley
Keyword(s):  
Rainbow Trout ◽  
Temperature Gradient ◽  
Temperature Gradients ◽  
Salmo Gairdneri ◽  
Vertical Temperature Gradient ◽  
Temperature Preference ◽  
Vertical Temperature ◽  
Preferred Temperature ◽  
Distribution Of Fish ◽  
Vertical Gradients

During their first 12 mo of life rainbow trout, Salmo gairdneri, preferred progressively cooler temperatures as they grew older; 19 °C was selected during the 1st mo and the selected temperature declined by intervals of 0.5 °C for each of the following months up to the 3rd mo. Fish swam higher in temperature gradients exposed to overhead illumination than in those in total darkness. This trend was reversed during the following 9 mo. These findings demonstrate the important role that age plays in the temperature preference of this species and the influence that overhead light may have on the distribution of fish in vertical gradients. Key words: preferred temperature, age, Salmo gairdneri, light gradients

Spectrum of Small-Scale Oceanic Temperature Gradients

1976 ◽  
Vol 33 (10) ◽  
pp. 2296-2306 ◽  
Author(s):  
J. A. Elliott ◽  
N. S. Oakey
Keyword(s):  
Temperature Gradient ◽  
Thermal Diffusion ◽  
Temperature Gradients ◽  
Small Scale ◽  
Vertical Temperature Gradient ◽  
Vertical Temperature ◽  
Spectral Maximum ◽  
Sharp Interfaces

The spectrum of the vertical temperature gradient is computed for a number of "typical" 50-m long profiles from the upper 200 m of the ocean. Most of the variance occurs in the microstructure range, between approximately 1 and 100 cycles/m; there is normally a spectral maximum near 10 cycles/m. The shape of the spectra for the range 10–100 cycles/m agrees well with that predicted for sharp interfaces that have been smoothed by thermal diffusion.

Preferred Temperature of Fish: a New Method

1976 ◽  
Vol 33 (8) ◽  
pp. 1815-1817 ◽  
Author(s):  
Rudolf Müller ◽  
F. E. J. Fry
Keyword(s):  
Body Temperature ◽  
Temperature Gradient ◽  
New Method ◽  
Lepomis Gibbosus ◽  
Vertical Temperature Gradient ◽  
Vertical Temperature ◽  
Mean Body Temperature ◽  
Preferred Temperature ◽  
Preferred Temperatures ◽  
The Mean

A simple apparatus for establishing a short, steep vertical temperature gradient is described. The preferred temperature is found by determining calorimetrically the mean body temperature of fish in such a gradient. Preferred temperatures at various acclimation temperatures for a sample of young pumpkinseed, Lepomis gibbosus, are given.

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.

Breakup and capture of two sedimenting drops in a vertical temperature gradient

2005 ◽  
Vol 17 (3) ◽  
pp. 032103 ◽  
Author(s):  
Michael A. Rother ◽  
Robert H. Davis
Keyword(s):  
Temperature Gradient ◽  
Vertical Temperature Gradient ◽  
Vertical Temperature

The research of the cross-links effect influence in the color matrix photodetector on an error of the air tract vertical temperature gradient determination

2017 ◽  
Author(s):  
Ivan S. Nekrylov ◽  
Maksim A. Kleshchenok ◽  
Aleksandr N. Timofeev ◽  
Elena A. Sycheva ◽  
Vadim F. Gusarov
Keyword(s):  
Temperature Gradient ◽  
Vertical Temperature Gradient ◽  
Vertical Temperature ◽  
Cross Links ◽  
The Cross

Laboratory Methods for Determining Temperature Preference

1977 ◽  
Vol 34 (5) ◽  
pp. 749-752 ◽  
Author(s):  
Robert W. McCauley
Keyword(s):  
Temperature Gradient ◽  
Social Interactions ◽  
Physiological State ◽  
Thermal Gradients ◽  
Temperature Preference ◽  
Laboratory Methods ◽  
Preferred Temperature ◽  
Laboratory Techniques ◽  
Different Types ◽  
Temperature Preferences

Different types of temperature-gradient devices used in the laboratory to determine temperature preferences of fish are classified and reviewed. The type of device used seems to have less effect on experimental results than do other variables such as age, size, season, physiological state, or social interactions. Key words: preferred temperature, thermal gradients, thermoregulation, behavioral, gradient devices, laboratory techniques

Effects of sexual maturation and sex steroid hormone treatment on the temperature preference of the guppy, Poecilia reticulata (Peters)

1980 ◽  
Vol 58 (4) ◽  
pp. 586-588 ◽  
Author(s):  
Peter H. Johansen ◽  
Jennifer A. Cross
Keyword(s):  
Temperature Gradient ◽  
Poecilia Reticulata ◽  
Steroid Hormone ◽  
Hormone Treatment ◽  
Sex Steroid ◽  
Horizontal Temperature Gradient ◽  
Temperature Preference ◽  
Preferred Temperature ◽  
Sex Steroid Hormone ◽  
Lower Temperature

In a horizontal temperature gradient, male guppies prefer a significantly lower temperature (24.5 °C) than females (28.2 °C) or juveniles (28.1 °C). Treatment of juveniles and females with testosterone lowers their preferred temperature to that of males. The reduction in the preferred temperature of testosterone-treated juveniles can occur without the development of male secondary sexual characters. Estrogen treatment of juveniles is without effect, as is treatment of males with estrogen or testosterone. It is postulated that testosterone acts at the level of the hypothalamic thermoregulatory centre.

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