Pineal gland N-acetyltransferase and hydroxyindole-O-methyltransferase activity in the rainbow trout (Salmo gairdneri): seasonal variation linked to photoperiod

1988 ◽  
Vol 94 (3) ◽  
pp. 333-337 ◽  
Author(s):  
Dougal J. Morton ◽  
Heather J. Forbes
Keyword(s):  
Seasonal Variation ◽  
Rainbow Trout ◽  
Pineal Gland ◽  
Salmo Gairdneri ◽  
Methyltransferase Activity

The regulation of day–night changes in hydroxyindole-O-methyltransferase activity in the pineal gland of steelhead trout (Salmo gairdneri)

1976 ◽  
Vol 54 (9) ◽  
pp. 1530-1534 ◽  
Author(s):  
John R. Smith ◽  
Lavern J. Weber
Keyword(s):  
Pineal Gland ◽  
Sharp Increase ◽  
Pineal Region ◽  
Salmo Gairdneri ◽  
Steelhead Trout ◽  
Methyltransferase Activity ◽  
Surgical Exposure

Elevation in pineal hydroxyindole-O-methyltransferase (HIOMT; EC 2.1.1.4) activity in juvenile steelhead trout was associated with the dark portions of three different photoperiods with a sharp increase in pineal HIOMT activity occurring in the first 4 h of darkness. This pattern of activity could be abolished by bilateral enucleation but not by surgical capping of the pineal region. Surgical exposure of the pineal region in blinded fish did not restore HIOMT responses to changes in lighting.

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.

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