Most trap nets are too deep to fish by, but if the commercial fisherman is using gill nets, then they are not as deep. My advice would be to stay away because if your prop gets caught in the net, it could ruin it and do more damage to you boat then worth it. Most nets are too deep to harm boats, but they are usually marked with flags at each end. Technically by law you are required to stay away from the nets and if the owner would catch you, lets just say it would not be pretty. My dad is a commercial fisherman and he gets pretty angry when people get too close. Some nets are worth 5,000 to 10,000 depending on the size! Just my advice, do with it what you will!