fish/blood/bone fertiliser

Welcome to the site 

Afraid I can't help with the question (though it's a really interesting one  )

Mum: 2007! What a memory! 

It would certainly seem a shame to just throw away such a mineral-rich source of nutrients but on a relatively small scale I can't see how you can do anything other than freeze it all in bags until you have enough to bury (under a tree, in a trench?) otherwise the pong would be unbearable!

Even then I would think twice about it if I knew I had foxes in the area.............

Hi Mike welcome to the forum. I do a bit of boat dangling myself and have always dug the heads and frames into the ground after a filleting session.
Dig it in at least a spit deep to avoid any smell or the local cats digging it back up. Next years runner bean trench is a good home for it but at this time of year you have to put it anywhere you have a bit of empty ground.
Its a good idea to mark both ends of the hole with a stick so you do not exhume the old stuff when you bury more. It honks !