From Sailors and Traders: A Maritime History of the Pacific Peoples, by Alastair Couper (U. Hawai‘i Press, 2009), pp. 102-103, 106:
As a result of continued shortages of crew, British and American ships frequently sailed shorthanded for the Pacific. The trips involved passages that were four to five months long, via the Cape of Good Hope or Cape Horn. American ships sometimes picked up a few sailors in the Atlantic Islands but generally shipowners were not unhappy with depleted crews, which reduced labor costs during these unproductive legs of voyages. Not so for the disgruntled seafarers whose lives were endangered from shortages of experienced shipmates in bad weather and when beating around Cape Horn against strong headwinds.
Arrival in the trading and whaling areas of the Pacific entailed supplementing the crew, all the more necessary because ships would lose many of the original crew during the three to four years the men were employed in the Pacific. Most losses were due to desertion….
The cautionary note on the recruitment of Samoans as sailors reflected the persistent bad reputation of those islands, arising from the massacre of the boat’s crew of La Perouse in 1787. [I believe La Pérouse was the name of the commander, not the name of his vessel.—J.] Whalers by the 1820s were likewise returning with stories of treachery and savagery experienced in parts of Melanesia and Micronesia. Such tales led to more misgivings regarding taking crew from several of these islands. The situation was different in Tahiti and Hawai‘i, where local seamen were encouraged by chiefs to serve and showed reliability even in difficult Arctic voyaging. Several Hawaiians are recorded to have been on that coast in 1788 under Captain John Meares. The New Hazard increased her crew from twenty-four to thirty-three in 1811 for voyages to the northwest coast, additions that were simply designated as “kanakas” in logbooks and journals. The ill-fated Tonquin had a Hawaiian crew of twenty-four when it was destroyed possibly by the captain after Indians boarded on the coast, and the fur trading ship Beaver took on ten “kanakas” in 1812, together with an experienced island sailor, bosun Tom. American whalers subsequently obtained most of their crews in Hawai‘i and Tahiti and also periodically at the Marquesas, the Carolines, and New Zealand….
Captains clearly preferred Pacific seafarers, who were used to compliance toward chiefs and thus unlikely to give captains trouble by demanding seafaring customary rights on board. The islanders were useful too as interpreters and understood the Pacific ways of trade. As sailors they were skillful at handling loaded boats through heavy surf when ships had to stand off and on. On whalers they acquired reputations as good harpooners and for boldness in closing on a whale. The keen eyesight of island sailors earned them the tobacco bonuses for spotting whales, and this, along with reading the signs of the sea for sudden squalls and reefs, made them invaluable as masthead lookouts.
Swimming and diving proved other important assets. Turnbull was impressed when, on approaching Hawai‘i, he encountered people a mile offshore supported only by “a thin feather-edge slice of wood.” He refers also to Hawaiians diving from topgallant yards and swimming under the ship. This skill of deep diving was employed on pearling and bêche-de-mer ships, as well as for making underwater hull repairs and clearing fouled cables. The extent to which island men and women were at home in the sea is further alluded to in dramatic rescues. Copping describes how, when the Harriet of Sydney was totally lost near Te Puna in April 1840, “the crew would have been lost also if it had not been for the Maori women on board the ship swimming them ashore.” He relates also that when his own whaleboat broached to, and he was knocked overboard and trapped under the boat, a shark “lay hold” of his shoulder, but “my harpooner a Maori jumped overboard after me.” Similarly when James Bagley fell from the topgallant crosstrees, a Hawaiian seaman, John Mowhee, dived after him and told Bagley to hold on to his shoulder until they were rescued.
For the shipowners a more compelling reason for employing Pacific seafarers was their lower costs in wages and victualing. The whaleship owner F. Parbury, who gave evidence at the British House of Lords Select Committee on the Navigation Laws, readily attested to this and expressed preferences for New Zealand (Maori) crews.