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In page Zebrafish:

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When close relatives mate, progeny may exhibit the detrimental effects of inbreeding depression. Inbreeding depression is predominantly caused by the homozygous expression of recessive deleterious alleles.[1] For zebrafish, inbreeding depression might be expected to be more severe in stressful environments, including those caused by anthropogenic pollution. Exposure of zebrafish to environmental stress induced by the chemical clotrimazole, an imidazole fungicide used in agriculture and in veterinary and human medicine, amplified the effects of inbreeding on key reproductive traits.[2] Embryo viability was significantly reduced in inbred exposed fish and there was a tendency for inbred males to sire fewer offspring.[citation needed]