does anyone know if you can make it yourself i have a river by my house that is full of gizzard shad would they work?

If you just bury fish carcasses in the garden, the effects will be the same. Do you own a cat? You will!
Do you have any wild or ferral animals living nearby? They are gonna love you:-)

You can add fish in small amounts to a hot compost system. Smash them up first for faster decomposition.
Making your own fish fert involves having fish rot in a sealed container for a few weeks with some sawdust added. Not sure of the details but it can be done. Pretty much any fish will be fine.
(It really is lots simpler just to buy the finished product.)

Thanks for the fish in sawdust tip.I can just seal a 5 gallon bucket& hold nose& not breathe when open*run-like-mad* to get fresh air.I dump my fish guts in compost but that fish fry is reeking.was about 15 fish sliced& filleted& very yummy.plus the battery stopped in the bait bucket...so had a nice smelly mess to dump in as well.(I did pour some of the water in the lilly tirebed.)