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.
3 PIECE 18" / 46cm Fish Poaching Kettle Steamer Pan Set in Stainless SteelKitchen Craft Clearview Stainless Steel Fish Poacher, 18 InchMaster Class Stainless Steel Fish Bone Tweezers
3 PIECE 18" / 46cm Fish Poaching Kettle Ste...
£24.99
Kitchen Craft Clearview Stainless Steel Fis...
£24.37
Master Class Stainless Steel Fish Bone Twee...
Kitchen Craft Professional Stainless Steel Short Oval Handled Fish SliceLarge 24" Fish PoacherStainless Steel Fish Scaler
Kitchen Craft Professional Stainless Steel ...
£3.15
Large 24" Fish Poacher
£34.99
Stainless Steel Fish Scaler
12 PCE FISH KNIVES & FORKSWMF Profi Plus Turner, Stainless Steel
12 PCE FISH KNIVES & FORKS
WMF Profi Plus Turner, Stainless Steel
£14.25