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Plasma norepinephrine and epinephrine from cannulated trout were measured by high pressure liquid chromatography with electrochemical detection. The catecholamines were extracted with acid‐washed alumina using a microfilter assembly which permitted analysis of small volumes of plasma. Mean (± S.D.) values for plasma norepinephrine and epinephrine were 1.83 (0.97) pmol ml−1 and 8.95 (4.94) pmol ml−1, respectively. These values are compared with catecholamine levels from other vertebrate species.
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John J. Woodward (1982) studied this question.
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