The effects of thyroxine or a GnRH analogue on thyroid hormone deiodination in the olfactory epithelium and retina of rainbow trout, Oncorhynchus mykiss, and sockeye salmon, Oncorhynchus nerka

2002 ◽  
Vol 127 (1) ◽  
pp. 59-65 ◽  
Author(s):  
E.M Plate ◽  
B.A Adams ◽  
W.T Allison ◽  
G Martens ◽  
C.W Hawryshyn ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Thyroid Hormone ◽  
Oncorhynchus Mykiss ◽  
Olfactory Epithelium ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Gnrh Analogue ◽  
Rainbow Trout Oncorhynchus Mykiss

Horizontal and vertical movements of telemetered rainbow trout (Oncorhynchus mykiss) in Lake Washington

1995 ◽  
Vol 73 (1) ◽  
pp. 146-153 ◽  
Author(s):  
Eric J. Warner ◽  
Thomas P. Quinn
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Average Velocity ◽  
Sockeye Salmon ◽  
Depth Distribution ◽  
Prey Species ◽  
Nearshore Zone ◽  
Vertical Movements ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Lake Washington

In summer and fall 1989, six rainbow trout (Oncorhynchus mykiss) were tracked in Lake Washington with ultrasonic transmitters for a total of 349 h to determine their movements in relation to the distribution of possible prey species. The trout moved primarily in the nearshore area at an average velocity of 12.4 cm/s (~ 0.25–0.3 body lengths/s). Five of the six fish made one more rapid (>1 body lengths/s) excursion across the lake, then continued moving in the nearshore zone. The trout were generally inactive, staying close (<50 m) to shore at night, and became more active near dawn; however, the highest average velocities were at dusk. They spent over 90% of their time in the top 3 m of the water column and 10% in brief (2 min), shallow (mean 6.6 m) dives. Dives occurred most frequently at dawn and during the day (0.8/h), less often near dusk (0.5/h), and seldom at night (0.1/h). The depth distribution and movement patterns suggest that the trout were feeding on Daphnia pulicaria during the day, in both nearshore and offshore areas, supplementing this diet with nearshore fishes such as prickly sculpins (Cottus asper). Predation on pelagic planktivores (longfin smelt, Spirinchus thaleichthyes, and juvenile sockeye salmon, Oncorhynchus nerka) was unlikely because the trout were primarily found nearshore and near the surface, whereas the planktivores are primarily offshore and closer to the bottom.

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