I like this idea a lot but have no idea where to get any of the stuff listed in the recipe. I will poke around today see what I find.
There is really no recipe necessary for the LCE itself. All you are doing is extracting spores and cysts and a few active microorganisms.
If you do the prefeeding then this is really more of a compost tea than LCE and you will likely have success using just black strap molasses. The more I learn, the simpler I trend.
One caution about fish hydrolysate which I've learned in the past couple of years is that the 3% phosphoric acid used to stabilize it is actually fairly high in terms of soluble phosphorus so bear this in mind.