I have often been asked how long a whale can stay below the surface. It is quite impossible to answer this with a general statement since some species can undoubtedly remain submerged much longer than others. Twenty minutes is my greatest record for humpbacks but there is no doubt that the animals can stay under a much longer time, if necessary.
A blue whale which we struck off the Japanese coast sounded for thirty-two minutes. In the north of Japan there was a whale of the same species which had had its dorsal fin shot away by a harpoon and had become extremely wild. The animal could be easily recognized by the large white scar on its back, and for three successive years was hunted by various ships of the whaling fleet. He was said to stay below half an hour each time and only spout once or twice between dives. One day, when seventy miles at sea, the ship I was on raised his spout, but after the whale went down we lost him. We were close enough to see the white harpoon scar as he sounded but I did not have a further opportunity to witness his reported eccentricities.
At Ulsan, Korea, Captain Melsom killed a blue whale which stayed below fifty minutes, spouted twenty times, and then went down for forty minutes. The longest period of submergence which I recorded for a finback was twenty-three minutes. There are many tales of the great length of time which the small-toothed whale, called the “bottlenose” (Hyperoödon rostratum), will remain under water but I have had no personal experience with this species. It is said that when a bottlenose has been harpooned it not infrequently sounds to a great depth and stays below for over an hour.
Many whalemen believe that cetaceans can remain under water for a long time without coming up to breathe. This owes its origin to the fact that whales will suddenly appear when for several hours previously there has been no sign of a spout even at a distance. Captain Grahame first called my attention to this fact and since then I have personally witnessed it twice.
“Suddenly, not more than two hundred fathoms in front of the ship, four humpbacks spouted and began to feed.” The flukes of one are shown, in the distance is a second which has just spouted, and the smooth patches of water where the other two descended are seen in the foreground.
Once, when sixty miles at sea off the Japanese coast, trouble with the engines caused the ship to lie to for about three hours. During most of that time I was in the barrel at the masthead watching with glasses a school of porpoises (Lagenorhynchus obliquidens), which were playing about some distance from the ship. As far as I could see there was not the slightest sign of a whale nor had there been for at least two hours. Suddenly, not more than two hundred fathoms in front of the ship, four humpbacks spouted and began to feed. They remained for almost half an hour in our immediate vicinity, wallowing about at the surface, and then, as at a signal, arched their backs, drew out their flukes, and sounded. They rose again about half a mile away, spouted a few times and disappeared.
There is not one chance in ten that those whales could have blown within five miles of the ship, when they first appeared, without being seen. The ocean was as calm as a millpond and the sun so brilliant that the spouts glittered like a cloud of silver dust thrown into the air. From the masthead I could see for miles and had, moreover, been watching the water in every direction as the porpoises circled and played about the ship.
Practically the same thing has been reported to me at various times from other localities. Captain Grahame said that in Alaska at a certain place in Frederick Sound a school of finbacks used to appear suddenly every day about four o’clock in the afternoon. The whalemen seemed to be of the opinion that the animals had been under the water for some hours, perhaps sleeping on the bottom.
From what is known of the physiology of cetaceans this is highly improbable if not actually impossible. To me the most reasonable explanation seems to be the one advanced by Rocovitza, viz., that some species of whales frequently swim long distances at considerable speed without appearing to blow. When there is little feed and the whales are constantly moving, or traveling, I have seen them rise a mile or more from the place where they last disappeared, spout a few times and again go down, repeating this as long as they could be seen from the ship. There is no valid reason why the animals should not continue for half an hour or more without appearing to blow and during that time even slow swimmers, such as humpbacks, could cover three or four miles.