Possibly a giant squid? Maybe he was upset that the ship was serving calimari.
S&F

"In the morning, we found the whole village under a cloud. Three men, it was said, were out trying to catch swordfish, when all at once a great sea monster, with large staring eyes, appeared in front of them and proceeded to attack the boat. A desperate fight ensued. The monster was round in shape, and emitted a dark fluid and noxious odor. The three men fled in dismay, not so much indeed for fear, they say, but on account of the dreadful smell. However that may have been, they were so scared that the next morning all three refused to get up and eat; they were lying in their beds pale and trembling."- John Batchelor, "The Ainu and their Folklore"
