[quote=”Stefanie” post=2133]Encouraged by the threads on young paros, their possible age and sex, here and here in our forum, I opened a thread at the IGL-forum, concerning ageing and sexual differentiation/determination in young paros.
My questions – which I now would like to present to the whole paro community – were as follows:
1. Is it possible to estimate the age (or better: date of hatching) of young paros by taking the size as basis? How high or low is their growth rate in the first weeks of their life? Are there differences in the various species and forms?
2. The second, much more comprehensive question is about the determination of the gender in fishes. I heard that there is no chromosomal fixing of the sexes during fertilization, but that the gender evolves in the first few weeks after hatching. Is this true? And – concerning paros – at which age or within what time frame will the gender be fixed? Are all young paros male-coloured and dismiss this colouration when becoming female?
These were the questions I asked. Richard Brode gave a very interesting and exhausting answer and agreed to post it here in our forum, too – if we give him a little time.[/quote]
If this was answered could you please post a link here?
If it was not and if this problem occures within the Paro populations too, I can give several information about methods that are used to influence gender ratios within the aquarium killifish populations where getting close to only one gender is very often. (and are prolly functioning this way in the nature). I think its very likely that could work the same way for Paros and could improve intensive breeding methods to certain degree.