Certainly not a tropical fish but in a Aquarium says a lot about going that morning.. I bought a pound during the winter and took them to the lake in small batches... I had a 30 Gal tank out in my small Shed untill it got too hot... There was about 12 left when I moved the last into the House. There are only 4 now and about 3 inches long. They get small amounts to eat about 4 times a Day. You get to see how the Bar. Pressure changes what they do, and how ready they are to get something else to eat. This Morning the Pressure was low and slowly rising,, Cloudy ... Dew point low... for 7 hours now they have all been at the surface with fins breaking the water and feeding aggressively .. but I remember times they hugged the bottom almost ignoring food till it hit them in the head.. Today was THE DAY to go fishing