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The only problem I have had with N. foerschi is that the males tend to
outnumber the females by at least 20:1 at maturity. I don't know yet if
this
is survival of the fittest or if that is a skewed hatch ratio. I am now
running an experiment with several hundred fry where I remove any male as
soon
as it shows color. I am now into about the 4th week of doing this and they
still keep coloring up. I have identified a few real females and removed
them
for next generation breeding stock. I have not kept track of how many males
(and I can not go back and count them - many of them are no longer with
us).
If I end up with 20 females, I still have about 20 males saved for them. In
retrospect, I should have kept records. Next time, maybe. They are
prolific,
no doubt. Other Nothos have not been so skewed in my experience, but also
not
as prolific.
Incidentally, all these foerschi eggs were collected by separating
from
greensand and the hatch percentage was very high - I knew how many eggs
were
collected. In these batches I had over 100 eggs collected each week from a
trio.
Lee Harper
O.K. more (dumb) questions from Chris.
#1.) I have heard that sex ratios in annual killies can be effected by
PH. Is this true and has anyone done any statistical analysis on which PH
produces which sex ratio? If so are all annuals effected in the same way?
Does non boiled peat produce a skewed sex ratio. Does boiling peat with
baking soda skew the ratio in the other direction?
#2.) What is green sand. I have seen it referenced several times. Is
this just dyed silica sand or is it something special? Does it have any
buffering characteristics or is it inert? Where does one acquire it?
Chris Graseck, cgraseck at Ludl_com, 1421 Mamaroneck Ave, Mamaroneck NY 10543