Abstract
From arguments elucidated by Funkenstein and others, it was hypothesized that the aggressive display of the Siamese fighting fish was under hormonal (i.e., norepinephrine) control. 18 visually isolated fish were observed for 10 min. each under a plain water control condition and with norepinephrine bitartrate solutions in their individual living tanks. Significant increases in the frequency of fin extensions, gill-flaring responses, and increased coloration were found for the drug group. 6 fish treated with epinephrine bitartrate resembled the control fish except for color change; all 6 bleached during observation.
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