>Just wondering out loud. I have noticed a few of my Pseudomugil fry seem
>to have difficulty swimming horizontally. They seem to be swimming head up
>and tail down. Is this like the swim bladder disroder that is often
>described by Killifish breeders? Water poblem? embryonic development
>problem? Genetic disorder? Pathogenic Disease? I kinda don't think that
>it is the last, but the fry don't seem to get over it. I haven't seen it
>on melanotonaids. I have noticed it on Ps. furcata and Ps. conniea. I
>do get a small percentage of deformities (scrunched bodies ala ballon
>mollies, crooked spine, etc) that may be a result of Ca deffieincies or
>inbreeding (I don't think these species have been recollected inrecent
>history).
Hi Mach
I've seen this problem in many species and not just rainbows. Seems
the swim bladder never fills with air and the fry expend all their
energy just trying to swim. I've heard bows need to get a gulp of air
to fill it shortly after hatching. But this may not be the true cause,
but just a unfounded hypothesis. But I have heard reports of whole
batches of fry coming up this way. This would lead me to guess that
something in the water was out of balance, or the parents weren't in
good enough condition and produced weakened fry. I've never had a
whole batch go this way so its only a guess.
later
Cary Hostrawser
My Rainbowfish Home Page
http://pw2.netcom.com/~caryho/home.html
Rainbowfish Study Group Web Page
http://home.stlnet.com/~gwlange/rainbowfish.index.html