Hi Judi,

Besides Genetics, fish deformities can be cause by high ammonia content in
the water when eggs are developing. Deformities can also occur when quick
temperature changes occur to eggs or fry. One of the biggest reasons for
fish deformities is water quality during the fry stage. High ammonia, high
nitrites and chemicals in the water are all reasons for deformities. Poor
water quality is probably the biggest reason for deformities in KOI and
Goldfish fry and can cause other physical damage to the fish is continued as
the fish grows.

Like I always have said, "the third things for good fish care is Good water,
clear water, Clean water. If you concentrate on these three precepts you
will have happy, health fish.

Tom L.L.
"Judi9000" wrote in message
...
Hi again Ingrid. I don't have any deformities in any of my fish. I just
noticed
one for sale at a koi show. I was just a little interested in finding out
more
about it. Thank you for your replies. Judi