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How long to expose an adult zebrafish? 

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Adult zebrafish can be exposed to different substances for varying durations depending on the specific study objectives. In one study, adult zebrafish were exposed continuously to either an organochlorine insecticide, DDT, or an organophosphate insecticide, CPF, for either two or five weeks . Another study used propofol for immersion euthanasia of adult zebrafish, with exposure durations of 20 or 30 minutes . A gelatin-based feed was used to deliver an NMDAR antagonist to adult zebrafish, but the duration of exposure was not specified . In a study on the effects of early mistreatment, young zebrafish were exposed to aggressive alcoholized male adults for 30 minutes daily for 10 days . In a study on the hepatotoxicity of methylparaben, adult zebrafish were exposed to environmentally realistic concentrations for 28 days . Therefore, the duration of exposure for adult zebrafish can range from minutes to weeks, depending on the specific research question being addressed.

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The paper does not mention the duration of exposure for adult zebrafish. The paper is about the development of a gelatin-based feed for individually tailored drug delivery to adult zebrafish.
The paper states that exposure to propofol for a duration of at least 30 minutes quickly and effectively euthanizes adult zebrafish.
The paper states that adult zebrafish were exposed continuously for either two or five weeks to insecticides.

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