A much more common condition caused by early exposure of fish larvae to oestrogenic substances is intersex, which in males usually takes the form of ovotestis.
A survey of 1100 lesbian, gay, bisexual, transgender, intersex and queer (LGBTIQ) people by Griffith and Bond University researchers found that the overwhelming majority had been victims of targeted harassment as well as physical and sexual abuse.
An intersex, then, is an animal that shows both male and female characteristics.
It is thought that around one in 1,000 babies are born with an intersex condition, the general term for people with chromosomal abnormalities.