[Zbrafish] Question on Swimming Behavior

Steven Waldron via zbrafish%40net.bio.net (by waldrons from u.washington.edu)
Tue Sep 21 13:18:08 EST 2010

Hi Rachel,

Sounds like a swim bladder issue.  Could be an infection or a defect.  
Is it a transient behavior? Do they show this behavior after eating the 

Seems like your pH is a bit on the high side.  Though perhaps unrelated 
to your issue, I would drop the pH down to around neutral or slightly 
below (i.e. 6.8).

best regards,
Steve Waldron
University of Washington

Rachel wrote:
> Hi all,
> I've been culturing D. rerio for the last 4 months in 120L glass
> aquaria on flow-thru water exchange system.
> Lately, I have noticed that some of my fish (mostly gravid females)
> have been swimming with their body in an odd position, nose-down-
> caudal-fin-up ( similar to a '/' position). In addition, the swim
> pattern is not a fluid motion but more of a quick jolting forward
> movement. I have noticed this behavior in adult fish only >90 dpf.
> WQ: Temp 26-27 degrees, pH 7.96-8.05, D.O. 96% saturation
> Feeding regime: 24hr artemia a.m. and p.m.; Tetratmin Flake Food at
> noon.
> Stocking density: <5/L
> Any thoughts on what could cause this behavior and what it could mean
> for my population?
> I appreciate your time,
> Rachel Pryor
> Student Services Contractor, USEPA
> pryor.rachel from epa.gov
> 850-934-9279
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