Why did he not attempt to save some of the fish?
The reason explained for the old man not putting the fish on the boat was... because it was too big and too heavy - i.e. it would weigh the boat down,
But he had a knife, why could he not cut out fillets of the best part of the fish? He had enough time as well. Is this really what a fisherman would do knowing sharks will come, just leave it?
Saying this I know nothing about fishing or sailing, so maybe there were lots of unrealistic happenings in this story, I welcome someone to correct me.
Also, I like the bit where he narrates over the dialogue of the tourists at the end :D would have been funny if he synched his voice with their lips.