Spark, it is a hoop net. Used to be commonly used here by commercial fishermen in bayous, rivers and lakes and set with the throat facing the current, They don't work well in still water but might if baited.
If you set for turtles, be sure to leave the top of the net above water along the full length of the net or you'll have a lot of dead turtles to deal with besides being regarded as pretty cruel. Might find something of their use on youtube.
