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A modified protocol for the extraction and analysis of cortisol in individual zebrafish, Danio rerio, embryo, and larva samples has been developed and evaluated. Recovery efficiency of the method was high, specifically calculated at 93.8% ± 6.5%. Dilution tests showed high parallelism, while increasing the number of individuals used in each extraction sample resulted in a linear, although slightly underestimated, increase of cortisol yield. Results of cortisol content from 0, 3, and 5 days postfertilization (dpf) fish using the proposed