My mix is made up of fresh shucked oysters, clams, white fish (fluke, Flounder, Sea Bass ect.), shrimp, 5 kinds of seaweed, Selcon, and tank water.Then it is blended to make a thick puree. I freeze it and then cut it into cubes and bag it. After your finished just wash your blender with plenty of soap and hot water.
I make my own and go to the local seafood dealer and buy scraps. That way its always something a little different and I get a better deal on it. Yes it does stink and I decided to keep the blender just for seafood. Also I add a little fresh clam juice to the mix as a thinner along with nori.
Back in Boston they used to have "fish goo" parties where basically everyone got some edible seafood threw em into a donated blender and distributed bags of the resulting blend to everyone that donated stuff. So instead of 20 peoples blenders getting horribly ruined from fish it was just 1 blender.
