Re: [RML] D.G inbreeding/RFB

Bruce Hansen (bhansen at ozemail.com.au)
Fri, 7 Feb 1997 09:20:21 +1100

Adrian seems to have tried all the usual variations to no avail in an
attempt to get his RFB's to be more productive. We don't have any figures
on hatchability in the wild but I guess it should be near 100% .

Maybe we should try to organise a wish-list of info needed for the next
trip out there. I would like to hear more about stomach contents, water
chemistry, temperature variation ( I get the impression that it is not too
variable despite the location.) and perhaps levels of nitrogneous wastes in
the water.

BTW I was interested to see the Etymology in FOS - I thought the Scat- part
might have been from dung (from the cattle dung around the springs) as in
Scatophagus ;-)

Bruce Hansen
ANGFA

email: bhansen at ozemail.com.au
Don't miss the ANGFA web pages at -
http://www.ozemail.com.au/~fisher/angfa.htm

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From: Adrian R. Tappin <atappin at ecn.net.au>

I found that even with wild stock the success rate was very low. My initial
wild stock consisted of 2 males and five females and the number of eggs
collected over the first 3 weeks was 180. Of these only 79 hatched - a mere
43%. The problem I find is similiar to Peters in that getting eggs is not
the problem getting them to hatch is! I find that many of the eggs are soft
and of course don't hatch. I haven't done a percentage check on good eggs
lately but suspect that its still around 40% or less.

I thought perhaps it may have been water conditions and bumped up the
alkalinity but that didn't seem to make any difference also tried
increasing
the salinity but again nothing? I also tried feeding them different types
of
foods but it doesn't seem to matter either.