Graduate Thesis Or Dissertation
 

Radiation inhibition of salt-water adaptation in fish

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/bc386n54s

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  • Four species of euryhaline teleosts (chinook salmon, Oncorhynchus tshawytscha, Walbaum; staghorn sculpin, Leptocottus armatus, Girard; starry flounder, Platichthys stellatus, Pallas; shiner perch Cymatogaster aggregata, Gibbons) were exposed to x-rays. The irradiated animals were maintained in either of two different environments. The effects of x-radiation were determined by observing the percent survival, plasma osmotic and electrolyte concentrations and histopathological changes of gill tissue. The results obtained are: 1. Survival of fish in either a fresh- or salt-water environment following irradiation is dose and species dependent. 2. Chinook salmon living in salt water showed increased mortalities and blood osmotic properties following irradiation. Hyperplasia of the support cell area of the gill filament was observed. 3. Staghorn sculpin showed few mortalities in saltwater (<10%) but a significant increase (P> .01) in plasma osmotic and electrolyte concentrations was noted in animals maintained in salt water following irradiation. 4. Starry flounder showed an increase in mortality and osmotic properties of blood plasma when maintained in salt water following irradiation. A decrease in osmotic properties was noted when animals were maintained in fresh water following irradiation and some mortalities were noted in both control and irradiated groups. 5. Shiner perch showed variable response to x-ray exposure but appears to be radiation sensitive.
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