Block printing ink works for me. I thin it a little bit and brush it on with
a soft brush. Use paper that will conform around the fish. I've used a real
fish and the rubber ones. Frankly, I like the real fish better and it's more
like what the original artists would have done.
There are numerous sites on fish prints. You can get some more ideas from
Last year, the kids painted a watery background with watercolors, printed the
fish right onto the damp paper, then printed leaves to make seaweed. Turned
out beautiful. JH