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Re: (sex ratios)
LeeH920226 at aol_com wrote:
> That's very interesting, since my water starts out about pH=7.8 and drops to
> about 7.0 within a few weeks of use, and even lower if I neglect water
> changes. I generally get fewer losses of fish if the pH stays about 7.0. Yet,
> I get very high male/female ratios.
A friend and killie mentor gets a very screwed (towards male) sex ratio
w/ many of his nothos. He raises them w/ peat and rarely does water
changes (pH probably gets very low). He had lots of problems w/ N.
I'd always wanted rubripinnis (my 'dream' fish), so he gave me some
eggs. I raised the fry without peat, and did more water changes. This
probably kept the pH higher. The result was that I got almost an even
sex ratio. (where as he got almost ALL males except for maybe one or
I've noticed that ALL the nothos I raise either have an even ratio or a
ratio w/ more females, never more males. That is, except the time I
raised N. guentheri like how the friend I mentioned above does. I got
all males, except maybe a 2 or 3 females.
The marked change in sex ratios may not have anything to do w/ the pH.
Maybe it's survival of the fittest when less water changes are given.
Maybe it's something else...I don't know. All I know is what happened.
Perhaps more knowledgeable people (e.g. Mr. Watters) can draw the
Great nothos such as N. rubripinnis shouldn't go extinct because of bad