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A comparison of the current, light, and grouping behaviour of the chum salmon migrant (Oncorynchus Keta) and the Coho salmon fry (Oncorhynchus Kisutch) MacKinnon, Dixon


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.

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