"a tuna, the dark prince, muscular, dangerous."
There is an imbalance of power between humanity and nature. Even a kamikaze pilot - the epitome of bravery - senses the danger of it. It's ironic as the pilot is not the most dangerous thing in the poem, but a fish is! The use of a metaphor, comparing the fish to a "dark prince" shows that it is important and significant and deserving of respect and honour, like a soldier. It's significance is further exemplified as it uses the first full stop in the poem, signalling that it is deserving of notice.