Hope I can get this accross. Bilge pump on hose goes to valve to direct water to a plastic spray bar I made (I don't think it is necessary) or run it through the black hose laying loose in the tank. Notice that there is a large drain that drains from the bottom of the tank. Just throw the pump over the side to run a constant flow of fresh Lake water into the tank. Throw the drain over the side. That's all it takes. To empty the tank throw the black hose over the side and put the pump in the tank and turn the valve to discharge through the black hose. Simple. You could get by with putting the pump on a hose and just putting the other end in the tank. Then reverse it to empty the tank. The secret to this is to have a constant supply of the Lake water that they are living in. There is no difference to the shad except they are in your tank instead of the lake. You need a large drain so that you can run 500 to 800 gallons per hour. If you run that much water over them it makes no difference what shape the tank is. They will be swimming around in the middle.
I very seldom lost a shad this way. When I was running down the lake I would throw the pump in the tank and it would pump through the spray bar. That wouldn't work for very long as the whole point is to keep a large supply of FRESH water going into the tank.
That's all there is to it. You put nothing in the tank but fresh water, lots of it. Oh yes use a light colored tank or you won't be able to see the shad.