I don't know how much fast nitrogen fish meal contains, probably a little from the blood content, but protein is slow nitrogen, and that's most of the N in fish. Dogs and varmints may dig where fish is buried. Both blood and fish will attract animals, but fish is worse.

I use feather meal. It is the same nitrogen content as fish meal 12% for half the price. I'm sure some of the other things in fish meal make it a better product but my garden is so large and exspensive to ammend. Animals like feather meal too. My dogs lick it if they can. I water it in and put mulch on top and that seems to help. The roses have responded really well to this.

Scatter 3-4 TB blood meal per plant or sq. yard and water it in.

"Water soluble" and "fast release" are synonymous. Protein N is slow release N which must be broken down by bacteria and converted to urea. Blood contains urea, nitrate, and nitrite, which are soluble and available. It also contains protein.

It's nice that this thread reappeared after a year; thanks for the info, Michaelg.

I'd wrongly thought that fish meal is a fast acting n source. I tried blood meal for the first time this year as a fast acting N.