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RE: Spawning over black sand
Hi Barry,
Try boiling, washing and cooling the peat before you put the eggs in!
Actually I have noticed the best hatches with black sand run towards the far
end of the incubation period. Eight months for RAC, and three for GUE etc.
I just thought that it was the fact that I incubate at room temperature
though.
Someone else told me that they were having problems with Jersey green sand,
I think it depends on how it was prepared. Rumor has it that it can contain
contaminants when it is collected and needs serious rinsing. I never tried
the stuff.
Peace,
~RJ~
-----Original Message-----
From: owner-killietalk at aka_org [mailto:owner-killietalk at aka_org]On
Behalf Of Barry Cooper
Sent: Monday, December 10, 2001 2:22 PM
To: killietalk at aka_org
Subject: Re: Spawning over black sand
Greensand is one of those media that seems to work for some people and not
others. I tried it some years ago for Nothos and found that I could easily
harvest lots of eggs that all looked OK. I put them in clean peat (boiled,
washed and cooled) and waited for them to hatch. None did. I don't know the
reasons for the failure. One is that the sand is abrasive and damages the
eggs during the spawning or separation processes. Another is that it is fine
and it may be that the eggs aren't accessible to the sperm and so don't get
fertilized. I suspect the former as the eggs I harvested looked clear and I
did not find a lot of white eggs.
The moral is, try it and see. It might work well for you. I ended up dumping
a 50lb bag on the garden.
Barry
At 12:53 PM 12/10/2001 -0500, you wrote:
>In a message dated 12/10/01 12:18:08 PM, jwwiii at pacbell_net writes:
>
><< Green sand has a long history of being safe for killies. Place the
netted
>eggs
>in boiled and rinsed peat, bag and gestate normally. >>
>
>Greensand has some virtues and also some negative features. First, on the
>negative side, you will wash it many, many times before it is nearly free
of
>fine milky components. Even then, over time and abrasion more is generated.
>This milkiness settles out and does not hurt the fish. On the positive
side,
>greensand is just the right size to separate easily by netting from all
>killifish eggs. It is under 0.4 mm and all killifish eggs that I have
>measured are over 0.8 mm in diameter. Another possible positive is that it
is
>a weak cation exchange aluminosilicate (potassium and iron are present),
has
>some softening effects on the water and is an effective fertilizer for
>aquarium plants. Also on the positive side is it is an attractive color,
dark
>green when freed of the fine clay particles.
>
>Lee Harper
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___________________________________________________
Barry J. Cooper, Prof., Dept. Biomedical Sciences, Cornell University
Current address: 27505 Riggs Hill Rd.
Sweet Home, OR 97386 (bjc3 at cornell_edu)
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