Lump behind head

[Causeofhim]

When I bought this guy we were told that he was a triple tail, but he has two tails. He’s grown a lot and seems very healthy. He now is growing a jump on his back, right behind his head. None of my other fish have this. Thoughts?

 

[Tula]

I agree it looks a little odd......but I've seen koi referred to as having "shoulders"....could this be the case?

How to predict if a koi will grow a shoulder hump or not?

I personally dislike koi fish with shoulder humps, and I would want to be able to know whether or not a certain fish will grow a shoulder hump or not.

www.koiforum.uk

 

[cas]

This thread is also talking about a koi with a hump. I never knew!

Kohaku With A Hump

I have a two year old Kohaku I bought last year as a companion for a new Chagoi. I purchased them from NDK. The Kohaku is developing a hump. I have never had one with this body shape. I know I have seen some beautiful koi from Japan with this hump. Is this genetic or some other reason? Is...

www.koiphen.com

 

[Mmathis]

Is that a Wakin?

 

[WaterGardener]

Looks like a Wakin to me too. Definitely not a koi.

 

[Causeofhim]

Is that a Wakin?

It seems to be. When I bought him I was only told he was a “triple tail goldfish”.

 

[Mmathis]

It seems to be. When I bought him I was only told he was a “triple tail goldfish”.

The only “fantail” goldfish I know of are fantails, Wakin, and Watonai. The body shape looks very much like a Wakin. The hump reminds me of koi. Maybe this guy is either a throwback or a Wakin/koi hybrid.

 

[Causeofhim]

His/her lumps have grown and multiplied. Doesn't seem to bother him though. Thoughts?

 

[j.w]

Those are some pretty big lumps! I always just let my fish be if they look like they are feeling ok and still eating well. Time will tell on this fish of yours. Does not look normal tho. Might be benign tumors or could be cancer. Either way if they keep growing it will not be good for the fish in the long run IMO. Still I would leave it be and let it live it's life.