We had six trout survive last summer in a non-aerated, eight foot deep pond that dropped over a foot during the summer. Cooler temps rolled around and they started eating. They fed all fall winter and spring and then stopped eating as the water warmed. They survived until the first week of July this year when our nieces and nephews spent the day and evening playing and swimming in the pond. That evening three of the six were found at the top swimming lethargically and subsequently died. I hope that you still have some alive that will surprise you in the fall.