Isinglass

And the swim bladder, the bladder is like a balloon inside the fish that it uses to keep it, help it stay afloat.

And the swim bladder that's inside it is used to make something called isinglass.

Isinglass is used for filtering proteins out of beer in particular.

You put it in and it helps collect all the proteins together and makes the beer clear.

It clarifies the beer by pulling out floating pieces of protein that are in