|Re: crossing xiphophorus helleri|
Subject: Re: crossing xiphophorus helleri
by Chromedome on 2010/5/23 13:49:59
so does this means that one "mating event" will decide everything for 5-9 broods?
No. Jim Langhammer advised me of a study that indicates that recent matings are more likely to fertilize the eggs of helleri than older, stored spermatophores. However, one cannot trust the newer sperm to be the only ones fertilizing eggs, and as such any fry are going to be suspect. Nor is there any data to suggest that "newer" matings are less likely to occur if she has stored spermatophores.
And it should be noted that the female does not store "sperm" but spermatophores, which are basically canned sperm! She must release the appropriate enzymes to dissolve the casing, releasing the sperm inside. They seem to have an expiration date, but no one has determined precisely what that is.