[Zbrafish] Spawning problems

[Christian Lawrence]

Giorgos,

That is very hard, and it is probably a problem, especially if these
levels were achieved rapidly.  Zebrafish are loosely classified as a
"hard water" species, but the values that I know they perform well
under are closer to 10-13 dH (this is where we run them in our
facility).  30 dH is very high and this is likely be the main problem.
 Running pH in the 8s is not a problem, unless of course you have
ammonia in your system.

At the end of the day, it is important to consider that there could be
(and likely are) many factors underlying your spawning difficulties.
Certainly a rapid swing to high hardness values could be the driver,
but it may be something else that is more problematic, especially if
you have had problems before your water controlling system
malfunctioned.

Zebrafish should not display a periodicity in spawning once they
mature.  If conditions and diet are right, they will only become
senescent with old age or as a result of negative behavioral
interactions.

Feel free to email me off list and I am happy to go through things
more thoroughly with you.

Chris

On 11/30/07, G. Koumoundouros <koumound from upatras.gr> wrote:
> Hello to everybody,
> for the last 3 months we face significant problems with the spawning of
> our fish. This is a problem that occasionally appears to our facilities,
> without been possible to be explained.
>
> This time, due to a malfunction or the RO water hardness elevated to
> almost 30 odH and ph to 8,4. Could this be a reason why we face this
> problem?
>
> Has anyone noticed any periodicity in the zebrafish spawning?
>
> Any help is appreciated
>
> Thanks in advance
>
> Giorgos
>
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-- 
Christian Lawrence
Brigham and Women's Hospital
Karp Family Research Laboratories, 06-004B
One Blackfan Circle
Boston, MA 02115
Tel: 617.355.9041
Fax: 617.355.9064