Length, weight and secondary sex character development in male and female phenotypes in three sex chromosomal genotypes (XX, XY, YY) in the killifish, Oryzias latipes

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Abstract
Length and weight of medaka appeared to be influenced by sex hormone‐treatment and genotype. Hormone‐treated genotypes were significantly shorter in length and slightly lighter in weight than untreated genotypes. The degree of response to androgenic and estrogenic treatment appeared to be strongly influenced by genotype. Growth of XX fish was stunted more by androgenic treatment than by estrogenic treatment. Growth of XY and YY fish was stunted more by estrogenic than by androgenic treatment. Differences in the metabolism of sex hormones by the three genotypes might be responsible for the variation in response to androgenic or estrogenic treatment. Sex phenotype, a unique interaction between genotype and exogenous hormone‐treatment, strongly influenced secondary sex character development (relative papillary size and number).