[Zbrafish] Juveniles and adults with open gills!

Bill Trevarrow via zbrafish%40net.bio.net (by trevarro from uoneuro.uoregon.edu)
Tue Mar 29 14:22:36 EST 2011

The operculum may be deformed (often folded forward instead of lying flat against the body) due to mutations in the genetic line, due to poor nutrition, or due to poor water quality during development. If you have a variety genetic backgrounds, you may see differences in this among them. 

Another possibility I have seen is a lack of pigmentation on the operculum allowing the red of the gills to show through. This can look like deformed operculum at first glance. It might not be a problem unless the pigmentation condition is undesired. 

On Mar 29, 2011, at 7:51 AM, Vishal wrote:

> Dear all,
> I am seeing many adult and juvenile zebrafish in my facility with open
> gills. I am not sure either the gill operculum is broken or head is
> deformed in a way that we can see gills from outside! Is there anyone
> who has seen this before? what could cause this and what can we do to
> prevent this to happen again in future? Please let me know. Any help
> would be greatly appreciated. Many thanks in advance...Regards
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Bill Trevarrow, Ph.D.
Thoren Aquatics
trevarro from uoneuro.uoregon.edu
Tel: (541) 844-9054
Fax: (541) 683-0996

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