SanJuana asks, "What information do you get for the observation?"

We take pictures of all the dolphins to identify them from any of their individual marks. The multiple parallel lines are from other dolphins teeth.They bite each other when playing and mating like dogs often do. The chunks of missing fins are usually from man made objects such as nets or garbage. It usually wraps around the fin and cuts through it as the dolphin grows. You cannot approach a dolphin to cut it off, so you have to hope it works it's way off sooner than later. One dolphin in Kalmos, Greece was observed by Tethys with no dorsal fin. It was cut off by a fishing line. The dolphin bled profusely, but survived. He is still swimming normally without a dorsal fin.