Those kind of sampling trips are always rewarding. I've got a couple of questions.
What did you do with Fry during his two weeks of captivity? Did he live alone in your bucket? If so, did you do any water changes? Did he share an aquarium? Did you feed him? Just curious to know what he experienced in that two week period.
Fry stayed in the bucket during the whole 2 weeks. For most of the period, he got daily 50% water changes. I was gone for 4 days during this time, and due to some miscommunications, he received no care during this time, but still grew and seemed fine. There were no other visible organisms in the bucket, but there were probably some microscopic organisms, since there was always some river water in the bucket. I think when he was really small, he was feeding on little critters like daphnia and other plankton. I had a little freebie pack of tropical fish food, which I fed him at first, reaaaaaly finely ground between my fingers. After that, I got some goldfish pellets, which I figured would be closer to his wild diet since he was a coldwater fry. I ground a couple of pellets between 2 spoons and sprinkled the powder in for him. Once he was slightly bigger, I could see him swallow tiny bits.