I thought this stuff was suppose to keep them not kill them. Had them in me air conditioned shed since last week with a bubbler in them. Got this shad keeper stuff in the mail today. Put in a table spoon put them in the back of the truck. Work called so my trip was cancelled. Went to put them back in the shed a hour later and more than half were belly up. So y’all think it was the shad keeper or the heat of the day ( temp change)....I bought the shad keeper because I cast net during the summer and bring home hundreds of threadfin to stock my pond with bait