Some people who live on the Delta like to eat fish (go figure

)
Some of these people use cages to keep the fish alive for a few days to 'cleanse' them, before they eat them.
That could be what that cage was used for, but on this site most folks immediately assume that it was someone using it to cheat in a tournament. It's a much more exciting thread than just assuming that there isn't anything nefarious going on.
Just sayin,
- Wolfeman
"Don't take life too seriously. You're not getting out alive." Bugs Bunny