I'm sorry if this is I. The wrong section. Anyway I plan on making a self sustaining 500 gallon temperate brackish pond and I need some fast breeding forage species for the fish I plan to stock( sea bass,oyster toadfish,tomcod, round goby)
You are in right section but here's the advice for you: check your laws in Ontario for keeping natives. It is illegal to keep round gobies in aquarium. I don't think brackish pond would working out if it was an outdoor pond and 500gal pond is too small for your stock anyways.