The effects of acid exposure on the ion regulation and seawater adaptation of coho salmon (Oncorhynchus kisutch) parrs and smolts.
Smolts exhibited decreases in plasma Na+ levels after 7 days and lower Na+, K+-ATPase activities 14 days after acid exposure. Parrs exhibited decreased plasma Na+ after 24 hr acid exposure. Plasma Na+ increased and Na+, K+-ATPase decreased in smolts after transfer to seawater. Parrs exhibited increased plasma Na+ as well as Na+, K+-ATPase activity immediately after transfer to seawater. It was concluded that acid exposure prior to entry into seawater was detrimental to coho salmon with regard to the length of acid exposure and stage of development. A possible mechanism by which fish die from acid stress is inhibition of gill Na+, K+-ATPase concomitant with decreases in plasma Na+ levels.
Powell
J F
JF
McKeown
B A
BA
D000143:Acids / Q000633:toxicity*; D000222:Adaptation, Physiological / Q000187:drug effects*; D000818:Animals; D004573:Electrolytes / Q000378:metabolism*; D005618:Fresh Water; D005880:Gills / Q000201:enzymology; D006400:Hematocrit; D006863:Hydrogen-Ion Concentration; D012474:Salmon / Q000502:physiology*; D012623:Seawater; D012964:Sodium / Q000097:blood; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000633:toxicity
D000143:Acids; D004573:Electrolytes; D014874:Water Pollutants, Chemical; D012964:Sodium; D000254:Sodium-Potassium-Exchanging ATPase