Date of Award

Summer 1973

Degree Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Biology

Abstract

1. Anesthesia induced by tricaine methanesulfonate (MS 222), quinaldine and urethane in the rainbow trout (Salmo gairdneri) produces initial cardioacceleration followed by prolonged bradycardia. 2. The response to anesthesia was investigated by means of atropine, dichloroisoproterenol, acetylcholine and epinephrine. 3. Cardioacceleration was found to be due to catecholamine release caused by the stress of anesthesia. 4. Bradycardia was found to be produced by an increase in vagal tone caused by anoxia. 5. Telemetric studies indicate all cardiac rates return to normal in 8 hours after removal from the anesthetic. 6. The results are discussed in relation to neural and hormonal control of the heart. 7. The suitability of each anesthetic is examined.

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