Delightful Wombat, but you forgot to mention what you do with the carcasses when the stock is drained.
You make a wonderful fish paste don't you? I know, you just forgot to mention it. (Norman Lindsay was right.) Sally is a good starting point for pastes also.
All the best, sorry to catch you in a "muddleheaded" moment but I could not resist. One of your name's sakes wakes me each night as it walks around the verandah and right under my bed, just the right height for a back scratch thinks Muddlehead.