Poaching Fish
If you want to poach fish whole, it's difficult to find a large enough pot.

It's quite acceptable to cut a fish into smaller pieces to cook and then reassemble on the serving plate, but a fish poacher is a good addition to have in your kitchen.

Here is a selection from Amazon UK.

US visitors will be able to click on the store below.
Stainless Steel 18 Inch Fish Poacher SetKitchen Craft Clearview Stainless Steel Fish Poacher, 18 InchMaster Class Stainless Steel Fish Bone Tweezers
Stainless Steel 18 Inch Fish Poacher Set
£19.99
Kitchen Craft Clearview Stainless Steel Fis...
£24.40
Master Class Stainless Steel Fish Bone Twee...
£5.25
Kitchen Craft Professional Stainless Steel Short Oval Handled Fish SliceLarge 24" Fish PoacherStainless Steel Fish Scaler
Kitchen Craft Professional Stainless Steel ...
£3.95
Large 24" Fish Poacher
£36.99
Stainless Steel Fish Scaler
12 PCE FISH KNIVES & FORKSWMF Metal Fish Slice IN 18/10 STAINLESS STEEL-1871756030
12 PCE FISH KNIVES & FORKS
£16.95
WMF Metal Fish Slice IN 18/10 STAINLESS STE...
£13.50