Chum salmon migrants (Oncorhynchus keta) treated with
thyroxine and testosterone show a less intense schooling
reaction than the control or thiourea treated fish. Coho
salmon fry (O. kisutch) subjected to the same treatments
showed that thiourea produced an increase in aggregation
while the grouping of fish from the other two treatments
was similar to that of the control cohos.
It was also found that thyroxine treated and control
chums subject to gradients of light intensity move toward
the areas of greater intensity. The thiourea treated chums
and the cohos from all treatments moved toward the lower
light intensity.
In another series of experiments it was established
that chum migrants and coho fry regularly move into the
faster of two parallel streams of water. The coho, however,
soon commence nipping and become indifferent to the faster
flow. / Science, Faculty of / Zoology, Department of / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/41529 |
| Date | January 1951 |
| Creators | MacKinnon, Dixon |
| Publisher | University of British Columbia |
| Source Sets | University of British Columbia |
| Language | English |
| Detected Language | English |
| Type | Text, Thesis/Dissertation |
| Rights | For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
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