You may want to repost this in the native section for response. It may be hard to breed chain Pickerel in an aquarium, as they can be challenging to keep in general due to feeding requirements. They are a pretty neat fish, both in terms of aesthetics and to catch. In addition to sites like aquaculturestore.com and jonahsaquarium.com you may be able to find them on aquabid, but I imagine they are pricey online. Do you know of any lakes or ponds in your area that have them? They are pretty easy to catch. The other option would be to have someone on here catch some and send them too you (if that is legal in your state and theirs).