[Zbrafish] Re: Swarming zebrafish embryo parasites

[finchg from ohsu.edu]

On Jul 31, 6:16 pm, RachelRay... from gmail.com wrote:
> While performing maintenance on a clutch of 48 hour zebrafish embryos,
> I came across one with a swarm of parasites within its chorion.  All
> the other embryos in the clutch were fine.  I examined the embryo 5
> hours later and it was almost completely devoured.  I assume that this
> is a parasite that the mother passed on?  Unfortunately, the cross was
> albino stock and the individual fish was put back into a group tank
> after breeding.  What were those things and what action if any needs
> to be taken?
>
> If anyone would like a picture or video of the embryo I’d be happy to
> send one in hopes of identifying the parasite.

See previous discussion on this board concerned with "coleps" for the
most information. Also:
http://zfin.org/zf_info/monitor/vol5.1/vol5.1.html#Coleps,%20Scourge%20of%20the%20Baby%20Zebrafish

These commonly contaminate embryo dishes and are frequently found
inside the chorion.  There is no silver bullet, if you have adults on
a seperate system from your fry you should try fluctuating the
conductivity significantly in the adult system on a semi-regular
basis.  Clean "bio-sludge" from system drain gutters and spillways and
frequently ethanol work areas, incubators, etc.  Bleach all eggs as a
short-term control.  Perhaps the most important single factor:
thouroghly clean your embryo dishes of everything but the embryos on a
daily basis (leftover chorion is the colep equivelant of the deluxe
nacho platter at T.G.I.Fridays).