Three milliliters of arsenous acid were effective in causing walleye to regurgitate their stomach contents into the throat. Determinations using fluorescent dye in the arsenous acid indicated that 80% of the solution was expelled during the first 5 minutes. Residual arsenic in the fish flesh was well below recommended safe levels. Three milliliters of tartar emetic caused projectile vomiting in largemouth bass. In identical situations, tartar emetic would be more effective than arsenous acid. Apomorphine was not as effective as tartar emetic or arsenous acid.
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Frank Jernejcic (1969) studied this question.