I quess its probably not the case with this excample, but I know that in some other species – like red cherry shrimps (not a fish:)) – but there you always used to have a problem with finding males, – and some people said it was because the males were much less attractive than the females, so in the shop they wouldnt be able to sell for the same amount of money, – so they were simply taken out before coming to the shop.
I also heard the same thing about a fish species, which unfortunately I cant remember which one was – but where it was a known problem, that what appeared in shops was alway only one sex (the most attractive one) – because for ordinary aquarium keeper perhaps looks is more important than breeding.
But I must say, I doubt in this case that someone (like at the location of capture) would actively take away the less colourful and attactive fish (in this case the females) and keep them away from appearing in the shop .. but who can say ?
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