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The effect of two different commercial products of Quillaja saponaria saponin extract on mortality of the free‐living copepodite stage sea‐lice Caligus rogercresseyi were assessed in vitro. Parasites were exposed for 24 hr to different concentrations of Quillaja extracts and then observed until 30 hr in non‐Quillaja media. The EC50 and EC90 were evaluated at 30 hr. High mortalities of copepodites...
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