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(0. kisutch) to a range of concentrations of copper (6.35 to 635 µg/L) or zinc (6.54 to 654 µg/L) for 105 min and reported that avoidance of L-serine was inhibited at all copper concentrations, but zinc concentrations had no effect. Bloom et al. (1978) exposed zebrafish (Brachydanio rerio) to 5000 µg/L zinc and reported that toxicant-exposed males failed to respond to concentrations of a female pheromone that attracted control fish. Despite variable exposure durations and concentrations, conclusions of other behavioral studies are consistent with results of this research. Our estimate of the 24-h EC1 for copper was 0.888 µg/L and is in relatively close agreement with results of Rehnberg and Schreck (1986) whose data reflect a concentration-response relationship and suggest that copper concentrations less than the lowest concentration tested (6.35 µg/L) would have adversely affected olfaction. Saucier et al. (1991) studied only one copper concentration (22 µg/L), but noted a significant loss of olfactory discrimination ability in exposed fish. Our estimate of the 24-h EC1 for zinc (135 µg/L) is considerably less than the no observed effect concentration of 654 µg/L reported by Rehnberg and Schreck (1986); however, the duration of exposure in the latter investigation was relatively short (105 min), and olfactory receptors may not have been irreversibly damaged over the concentration range studied. This conclusion is supported by Bloom et al. (1978) who showed that zinc exposure does adversely 15