The Efficacy of quinaldine sulfate as an anesthetic for freshwater fish
1973
Gilderhus, P. A. (Philip A)
Quinaldine sulfate (QdSO4), an improved formulation of the fish anesthetic qualidine, was tested for its efficacy on 15 species of freshwater fish. The new crystalline formulation is water soluble and thus easier to use than is practical grade quinaldine. QdSO4 anesthetizes most salmonids at 25 mg/l in less than 4 minutes and the fish recover in 1 to 13 minutes in fresh water. The efficacy of the anesthetic was little affected by water temperature, but the compound lowers the pH of some soft waters to below 6, the point at which it becomes ineffective as an anesthetic. All fish retained some reflex action and thus, some large fish were difficult to handle.
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