Fish tumor removal,tool for holding mass still?

[S100HP]

robbocop33 said:

Being the adventurous sort,and this may not be ethically correct,but i just would have felt a bit of a twit taking a goldfish to the vet i won at a fair about 15 years ago!,so i decided to operate on the fish myself,after 'much' reading and studying a few videos.
The goldfish has a re-occuring growth/tumor on it's eye,i have operated on it 3 times,removing fair lumps of the mass at a time(at it's largest it's about the size of a marble!)I've sort of bonding with this fish as it just keeps bouncing back from my cack handed operations!
I have used all the correct anaesthetic products,pain killers,cryogenic pen etc for keeping the tumor back.
Here's the question,and it's something i'm struggling with,can anyone recommend some kind of tool that will grip on to a firm,slimey,cylindrical,gelatinous mass while i do my highly skilled incisions?

Duck me

[soad]

Fish are often presented to aquatic veterinarians with ocular (eye) tumors. They range in all shapes and sizes and can cause considerable problems for fish. Not only does the drag of a tumor cause negative buoyancy while swimming, the fish, disturbed by the weight of the tumor, will try to knock it off. In the process of knocking its head against objects to rid itself of the tumor, the fish can harm itself to the point of suffering neurologic damage from head trauma.

The best treatment for ocular tumors is to remove the eye entirely. Fish in captivity get along just fine with one eye, or even no eyes. They can smell their food using their nares, and their specialized lateral line organ helps them to sense the sides of their pond or tank and their buddies around them.

[anonymous-user]

As a man who has killed many hundreds of fish and as this is a pet, did the butcher not stop to think pain might be an unfriendly consequence of cutting the fish up?