Dr Peter Cattin p.cattin at
Mon Oct 15 16:00:11 EST 2001

Hi Eric,

As mentioned by Bonnie Ullmann, you should look to the zebrafish 
web site at specifically and look at the Developmental 
Staging Series to see the generally accepted growth rates at 28.5 
degrees C.  A strange temperature to work at as it would not be a 
temperature zebrafish regularly encounter in the wild.  However!!!  

The size of 2.5 cm is well past the point of reaching sexual 
maturity which is typically closer to 20 mm than 25 mm and 
normally takes about 4-5 months to reach depending on water 
temperature, stocking density, feed quality, water quality etc.  

Growth rates will always tend to reasonably linear with fish growth 
generally referred to as being indeterminate and reflecting the micro 
environment rather than the age of the fish per ce.  This means that 
most fish will grow at a rate and to size determined as much by 
their immediate "circumstances" as to some predetermined, 
genetically controlled rate.  Obviously genes play a substantial role 
in this but probably less of a role than in many other animal 

Hope this helps,


Peter Cattin

Peter Cattin PhD
Division of Molecular Medicine
Faculty of Medical and Health Sciences
University of Auckland
Park Road, Grafton, Auckland.
Private bag 92019, Auckland,
New Zealand.

Tel: +64-9-373-7599 xtn. 6373
Fax: +64-9-373-7492

Eric Lobee wrote:

> I am interested in zebrafish breeding, and I would like to know, at
> what age they reach a size of 2,5 cm. under optimal rearing
> conditions. Furthermore, I would like to ask if someone could send
> me growth rates and e.g. a growth table of larvae, at different
> temperatures.
> Many thanks in advance,
> Kind regards, Jacqueline Geervliet

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