Apparently the muddy taste is from a chemical (I forget what it's called). Keeping the fish calm reduces it. But apparently milk removes it. Just like lemon or vinegar removes that fishy smell and taste of salt water fish, milk removes the muddy taste of fresh water fish.
From what I understand, absolutely keeping them alive and calm in a bath tub for a few days would work.
I was actually looking for for something else when I came across this book. It got me thinking...I am surrounded by carp. Literally less than 3 minutes walk from my front door is carp. I would not eat them, the water is a flood over flow dam to stop the town flooding. So it is still water and not flowing, so sus at best...But it does have carp and other fish in it.
Every time I make plans to hit the coast or target cod, something happens...But this book has given me some inspiration to target carp....So you know what is going to happen?? I target carp and it will be the best cod season in history !!!
itsaboat mate...Life is just a boat and then ya marry one !