lump on 'carp'

Hi

I'm new here and I've had bad experiences with newsgroups so I'm
treading carefully here....

I have 1 Koi, 1 Ghost Koi and 1 carp??(it was sold as a carp but I have
my doubts).

The 'carp' is long in the body, very narrow, kinked tail(fault I think)
and down turned mouth. I have noticed that this fish has a swelling just
below its gills on the underside. Is this eggs or a lump of more
sinister origins? I am grateful for any advice or suggestions...

This fish cost me £12 which was more than the Grade A Koi.

The tank is 24", fluval 1 filter and aeration stone. I do fortnightly
water changes at 50%, gravel cleaning etc. I feed a combination of
flakes and pellets. The 'carp' was used to pellets so I continue with those.

The fish is feeding well and appears quite well.

Carrie


p.s i apologise if this email gets posted more than once...