[Zbrafish] embryo decrease

Steven Waldron via zbrafish%40net.bio.net (by waldrons from u.washington.edu)
Tue Apr 15 10:41:40 EST 2008

Hi James,
You might want to make sure your fish are not too old too breed. After 
they are a year old or so their productivity can become capricious.

Separating the sexes from on another can also increase yields. The fish 
could very well be breeding in their holding tanks before you ever set 
up them up to spawn.

Steve Waldron
University of Washington, Seattle

James wrote:
> Folks,
> We had a student who was doing a project using Zebra fish embryo's
> this summer.
> At first he got pretty good embryo yields but as this semester
> progressed he got less and less until we got almost none at the end of
> this semester.  The fish were fed well and we should have had fairly
> good water so I am not sure what was the problem.  Do the fish just
> slow down over time and you have to start with fresh fish or fish that
> are kept under different light conditions?
> We had 14 light and 10 dark and put in a trap when we wanted to
> collect embryo's and we had about 10 adults for each of two tanks.
> I am a little worried because we have a student who will be doing this
> again in the Fall and we would like to be sure that we get plenty of
> embryo's.  Any suggestions on how to keep the numbers of embryo's
> high?
>  You can respond directly back to me at mahaffy from dordt.edu or to the
> list.
> He used the following setup:
> The test organism for my project was Danio rerio. The fish were
> acquired from the Dordt College biology department who originally
> obtained them from The Dog House Etc in Sheldon. The fish were housed
> in two separate tanks to help increase embryo collection numbers. Each
> tank was approximately 10 gallons and was maintained at around 28.5
> degrees Celsius for optimum embryo production. The fish were fed a
> rotation of fish flakes with brine shrimp or with blood worms. This
> diet encouraged more vigorous embryo production. It was better for the
> fish to be fed less food at more frequent intervals. The fish were
> maintained and bred according to accepted methods in The Zebrafish
> Book (Westerfield 2000). Frequent water cleaning (rotation) promoted
> embryo production. I changed over half of the water on a weekly basis
> (Westerfield 2000, Warolin 2002).
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