Can someone explain this?

I'm not much of a fisher but came across this the other day and was curious what's happened. Massive swordfish (?) on a beach in Canada Bay, Sydney. They only cut out a small fillet from the tail and took the sword. Why wouldn't they take more meat from the fish?

I'm not much of a fisher but came across this the other day and was curious what's happened. Massive swordfish (?) on a beach in Canada Bay, Sydney. They only cut out a small fillet from the tail and took the sword. Why wouldn't they take more meat from the fish?