An experimental study of the response of young Pacific salmon to sharp sea water gradients ...
The responses of chum and pink salmon fry, and coho salmon fry and smolts (Oncorhynchus keta, O. gorbuscha, and O. kisutch) to isotonic and hypertonic seawater were studied in sharp-gradient tanks to determine whether or not salinity gradients can act as directive agencies in the seaward migration o...
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| Format: | Text |
| Language: | English |
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University of British Columbia
2012
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| Online Access: | https://dx.doi.org/10.14288/1.0106300 https://doi.library.ubc.ca/10.14288/1.0106300 |
| Summary: | The responses of chum and pink salmon fry, and coho salmon fry and smolts (Oncorhynchus keta, O. gorbuscha, and O. kisutch) to isotonic and hypertonic seawater were studied in sharp-gradient tanks to determine whether or not salinity gradients can act as directive agencies in the seaward migration of juvenile Pacific salmon. Chum and pink fry responded positively to both concentrations of seawater. Coho fry responded positively to isotonic seawater but did not respond positively to hypertonic seawater. Coho smolts responded positively to hypertonic seawater. Acclimation of chum fry to seawater prior to observation of their responses resulted in a reduction of their initial response although there was no significant change in the levels of response finally obtained. Major differences in the concentration of the acclimatory solutions did not affect the responses of this species to hypertonic seawater. The activity of chum and pink fry, and of coho smolts generally decreased on first entry into seawater. ... |
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