In Hemingway's book The Old Man And The Sea, after catching the mighty Marlin, and coming to the conclusion that the sharks are probably going to consume the entire Marlin - why didn't Santiago just cut up the fish and stored at least parts of it on the board of his skiff?
I mean, it's stated that the weight of the Marlin was approximately 1,500 pounds and that it was as long as the boat, and possibly even longer, so there was no possibility to store the whole Marlin on the skiff. But, it was most definitely possible to store a few hundred pounds of it on board.
I understand, of course, that Santiago extremely respected the Marlin and felt that it is just "right" that they "sail" home together - side by side, as equals - but after the first shark attack, the Marlin was mutilated and Santiago knew that there's a fair chance that there will be nothing left of it when he'll reach his home port. At this point in time, he still had his knife, and the second shark attack, during which his knife was lost, came a few hours later.