Controlling the sex ratio is essential in finfish farming. A balanced sex ratio is usually good for broodstock management, since it enables to develop appropriate breeding schemes. However, in some species the production of monosex populations is desirable because the existence of sexual dimorphism, primarily in growth or first time of sexual maturation, but also in color or shape, can render one sex more valuable. The knowledge of the genetic architecture of sex determination SD is convenient for controlling sex ratio and for the implementation of breeding programs.
Sex determination in fish | Genome Biology | Full Text
Metrics details. An excellent candidate for the master sex-determining gene on the Y chromosome of the medaka fish is not related to the mammalian SRY gene. In contrast to mammals and birds, teleost fish display an amazing diversity of sex-determination systems. Male heterogamety males are XY and females XX, as is generally the rule in mammals and female heterogamety females are WZ and males ZZ, the system at work in birds are sometimes observed within the same fish genus and even the same fish species. More complicated systems can involve multiple sex chromosomes and multiple gene loci influence from autosomal loci on sex determination and polyfactorial sex determination. Hermaphroditism has been observed in fish; environmental factors for example temperature can also influence their sex-determination systems.