Sometimes the colourof the second dorsal is a help in younger fish - if the
dark colour extends all the way (except to the white edge) then it is more
likely to turn out to be a male -
DG's can change sex too - but I have only seen females change to males and
not vice versa.
bhansen at ozemail.com.au
> From: John Grylls <jgrylls at bendigo.net.au>
> To: rainbowfish at pcug.org.au
> Subject: [RML] Sexing desert gobies
> Date: Friday, 8 August 1997 20:49
> Hello all,
> I have recently purchased a nominal pair of Coward Springs desert
> gobies, the "male" is about 40-45 mm in length, and the "female" is
> 5-10 mm shorter. They quite are similar in appearance and behaviour,
> sparring and displaying on occasions.. The larger fish has a slightly
> more yellow head, and I think that I can convince myself that his head
> is flatter and proportionately larger, but there is not much in it.
> Their differences could be explained by sex, but I suspect it could
> also be explained by differing levels of maturity. Neither fish is
> sufficiently mature for genital papilla differences to be apparent.
> Any opinions would be greatly appreciated.
> John Grylls