Here's a freshwater story for you.
When I was about 12 I had an Oscar that I used to hand feed goldfish. My large Oscar mistook my little finger for the fish. My natural reaction was to jerk my hand out of the tank and shake him off. When I did, he ripped the pad on the finger wide open. I yelled. My mom, a nurse, grabbed a fresh towel squeezed my finger and instructed me to get in the car. Off to Beaumont Hospital (Royal Oak, Mi) for stitches.
I now have a fine white scar to remind me.
The fish?
When we got home he was laying where he landed. On the hardwood floor next to my bed. His gills were barely moving, so in desparation I grabbed him to throw him back in the tank. When I did, the flesh ripped off the side of his body stuck to the floor. Only ribs remained on that side. He SURVIVED! I had him for a couple more years. I didn't hand feed him anymore. He couldn't coordinate his swim well enough to catch live food anymore, so he survived on Purina trout chow till he died.
YUP, fish (and animals in general) are amazingly resilient.