Re: Threadfin shad
round container with a current...without a current, they bunch up & exhaust the oxygen supply in that little area where they all hang out.
water temp - don't let it drop below 75?
filter - got to filter the stuff they drop in the water out, also the amonia produced by the shad.
oxygenation - got to oxgenate the water - those fancy o2 tanks are nice but pricey.
water quality: if you use city water, add something that will neutralize the clorine. don't add ice, it has chlorine (unless you put it in plastic ziplock bags).
salt: add a handful of non-iodized salt
I built a shad tank out of a 19-gal plastic tub ($6 at walmart). a 200 GPH livewell pump attached to the outside near the bottom, discharge split, with half flowing into a filter (perforated box) with polyester pillow stuffing and activated charcoal (pet dept at walmart) and the other half flowing through a venturi to provide oxygen and current. Insulated with an emergency blanket (big sheet of mylar, 99? in the camping isle at walmart). Trailer side marker light for inside lighting. Paint the inside white, else they'll be hard to find inside.
From my experience, might as well release the ones that are gill-netted and those that fall to the floor of the boat, they won't last long in the tank.
something I learned the other day from my local fishing board: first put 'em in a cooler with lake water and a handful of non-iodized salt for a few minutes - they'll drop scales & go potty in there, then dipnet 'em into your tank. I'm going to try that next time.