hank's solutions

[Dallas Weaver, Ph.D.]

in article 9rkml0$lpi$1 at mercury.hgmp.mrc.ac.uk, Dr Peter Cattin 
at p.cattin at auckland.ac.nz wrote on 10/29/01 2:53 PM:  

> Christina,
> 

Zebra fish are very tolerant to a wide variety of water conditions and 
will spawn up to about 2000 ppm TDS and as low as 150 ppm 
within a temperature range of 21 to 29 C.  If you are using a recycle 
system, copper will be removed in the sludge.  The amount of 
copper which you will normally get into the water from cu pipes 
usually will not create a problem with high alkalinity water (Cu 
toxicity is a function of alkalinity).  Recycle systems with lime 
addition and very little water exchange will not have any copper 
problems.   

In high intensity recycle systems it is easy to add very significant 
amounts of cu in the feed to the system (100's of ppm) and never 
see any significant amounts in the water.  

Dallas

Dallas E. Weaver, Ph.D.  <deweaver at get.net>
Scientific Hatcheries
5542 Engineer Dr.
Huntington Beach, Ca 92649 USA
714-890-0138
Fax 714-890-2778