We gave up eating tuna decades ago because dolphins were also getting caught in the nets. The Department of Home Security came up with their own fish that you cannot eat and should be smart enough to avoid getting trapped. The BIOSwimmer can be used to inspect interiors of ships and exteriors of harbors. Check out the first few seconds of the video to catch the tunabot in action. This was made a couple of years ago so it must be really impressive by now.