[Zbrafish] Swarming zebrafish embryo parasites

[RachelRaynes from gmail.com]

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.