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Adding Gypsum Rock To The Water
September 12, 2008
3:01 pm
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mzapater
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July 30, 2008
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Hi there to you all.

I have been keeping Cualac tessellatus (F: Cyprinodontidae) from Mexico for a few years. It seems that nobody is able to maintain this species other than the people from the Vienna Zoo.

What they told us (and it worked!) is to add a piece of gypsum rock to the tank (rather plastic tub).

I know that gypsum is CaSO4, so that´s the only thing that will get dissolved in water (apart from impurities that the rock may contain).

The thing is that after adding this piece of rock most of the eggs turned up viable at least and the fry are growing pretty well. Got a nice batch of juveniles that we hope to share (starting with Matt).

What may be the effect of the sulphates in water? Do you know of any other species with such requirements?

Thanks in advance,

Manuel...

September 12, 2008
4:08 pm
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Mark Duffill
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If I am right CaSO4 is Calcium sulphate?

If that is the case wouldnt that send the pH and Hardness through the roof?

September 12, 2008
4:29 pm
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Matt
Málaga, Spain
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Yup Mark. I would guess that the egg production is inhibited without the presence of Calcium Sulphate Manuel? Where is the species from? Cuatro Cienegas?

Cake or death?
September 12, 2008
6:18 pm
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Mark Duffill
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What were you pH and Hardness readings Manuel ?

September 12, 2008
7:01 pm
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Matt
Málaga, Spain
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Questions, questions. /laugh.gif" style="vertical-align:middle" emoid="Laugh" border="0" alt="laugh.gif" /> I've done a bit of research and the species is on the IUCN Red List. It comes from only one lake in Mexico, La Media Luna (translates as "half moon"). The lake is fed by karstic streams that flow over gypsum so that would go some way to explaining why gypsum is needed? According to the description paper the pH was only 6.9-7.3 though. I'm also getting a group from Manuel tomorrow. Finally FISH!!!! /biggrin.gif" style="vertical-align:middle" emoid=":D" border="0" alt="biggrin.gif" /> /biggrin.gif" style="vertical-align:middle" emoid=":D" border="0" alt="biggrin.gif" /> /laugh.gif" style="vertical-align:middle" emoid="Laugh" border="0" alt="laugh.gif" />

Cake or death?
September 12, 2008
7:59 pm
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Eyrie
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[Layman's question]
I'd presume being a CA species that attempts have been made in the past to breed them in harder water (the data in the paper not withstanding), so could the sulphate be the missing ingredient for viable eggs?
[/layman]

Mature, sensible signature required for responsible position. Good prospects for the right candidate. Apply within.
September 12, 2008
9:10 pm
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mzapater
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Thanks for the quick replies.

The thing is that I don´t know (yet) the original characteristics of Vienna water, but ours are pH around 7,8 - 8,0, GH around 15.

So adding gypsum (calcium sulphate) shouldn´t affect that much pH, so the sulfates must be the key to the viability of eggs and also the wellbeing of fish.

I am always puzzled by such strange waters with low pH and high content of different salts, usually sulfates are there (such as the turkish lakes where Aphanius danfordii occurs).

Anyway, just another topic for research in aquariums /smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" />

Matt, hope you can do a good job with them, not fussy fish at all.

Manuel...

September 12, 2008
9:34 pm
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Matt
Málaga, Spain
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Manuel if I remember right from university the tap water in Vienna is natural ground water fed by a spring. It's famous as being some of the best in Europe. Let me see if I can get values for you hang on a sec.

Cake or death?
September 12, 2008
9:38 pm
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Matt
Málaga, Spain
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pH = 7.6
KH = 5
GH = 10

Obviously these may vary a bit depending on where in the city you are. /rolleyes.gif" style="vertical-align:middle" emoid=":rolleyes:" border="0" alt="rolleyes.gif" />

Hope that helps. Here's a quick pic of the Cualac habitat too that wouldn't upload earlier for some reason. /smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" />

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