Severely skewed sex ratios in zebrafish stocks can pose significant hurdles for line propagation and sperm cryopreservation. To overcome female-biased sex ratios in stocks derived from imported sperm samples, the Zebrafish International Resource Center has implemented routine supplementation of larval food with 17α-methyltestosterone to skew gonadal sex differentiation toward masculinization. Resulting stocks averaged 80% males.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9810344PMC
http://dx.doi.org/10.1089/zeb.2022.0029DOI Listing

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