Did a sports fishing trip to Aruba back in 89. The wind was so bad, we had to fish on the non wind side of an oil tanker. Caught a couple of small tuna and was getting pretty sick when the captain said enough and started back to shore.
Not a 1/4 mile from shore captain said he wanted to see if there was any dolphin in the water. Poles went in and within seconds I had a dolphin on. Brought that one in and not a minute later another was on. For thenext hour I was bringing in dolphin like mad.
Another dolphin was on and I am reeling it in. I see the dolphin come up to the side of the boat. All of a sudden the water around the dolphin goes red and the line goes slack. I bring in the fish and it was only the head. Mate said a wahoo bit it in half.
Next two days I stayed in the pool.
Those dolphin (mahi-mahi) run in schools. If you keep one in the water on hook, the school will stay with it and keep feeding. I have been in that situation too.