[Zbrafish] Water chemistry
(by trevarro from uoneuro.uoregon.edu)
Thu Jan 31 15:13:02 EST 2008
There are no simple answers to this.
Copper and zinc toxicity are influenced by the hardness/softness of the water.
The softer the water, the lower the dose of zinc
or copper that can affect your fish.
The toxicity varies with the kind of fish and as
we all know there is little of this kind of
specific information available for zebrafish.
Zinc is less toxic than copper, which is good in
your case, but your numbers are not that far from
levels that can cause problems in some kinds of
fish in some situations.
You might also want to check for other potential
metals in your water and possibly determine where
the zinc is coming from. When we had problems,
copper and zinc water coming from new copper
pipes. it was greater in the hot water lines and
jumped up in concentration after going through a
non-stainless steel heat exchanger (water heater).
We successfully used RO machines to remove copper
and zinc from the water we used. Resins to remove
the copper and zinc lowered the copper and zinc
concentrations but also lowered the water
hardness so much that the metal toxicity
If you want to do a test, set-up an aquarium with
water from a zinc free source, while holding all
other factors as similar as possible, and compare
relevant results (survival, growth, egg laying,
or symptoms listed in the ZIRC link for copper)
after a week or two.
Copper and other metals:
G. Wedemeyer, Physiology of Fish in Intensive Aquaculture
>We may still have a problem with our water chemistry. Does anyone know
>if 100 µg/l Zinc is suitable for zebrafish?
>The company claims that this not a problem. However, fish specialists
>say it's too much.
>What do you think?
>Thanks in advance for your help!
>Zbrafish mailing list
>Zbrafish from net.bio.net
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e-mail: trevarro from uoneuro.uoregon.edu
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