Reproduction involves mass spawning at night in spring or early summer (October – November in the Southern Hemisphere). A local red land crab descends to the sea the same night, the palolo is supposed to rise.[3] The terminal parts of their bodies drop off and float over the surface of the water,[4] releasing sperm and eggs. The mechanisms or triggers which induce spawning such that it occurs during nights of a waning moon, continuing for several nights, are not completely known.[5][6] Exposure to sunlight destroys this "tail" part of the worm's body afterwards.[7] The palolo worms' rising in Fiji is preceded by the descent of a local red land crab to the sea the same night.[3] In Samoa a crab known as mali'o also descends to the sea around the palolo rising.[3] Other sea creatures such as sharks and fishes come to spawn during the event.[3]
The palolo worm is found in tropical regions around various islands of the Pacific Ocean, including Samoa, Tonga, Fiji, Indonesia, Vanuatu, and some islands of the Philippines. They are variously known as palolo (Samoa and Tonga), balolo (Fiji), wawo or nyale (Indonesia),[7][8][9][5][10][11][12] Within these tropical regions, the palolo worms are usually found in shallow waters where there is coral rubble for them to take shelter in.[13]
Some Indigenous populations in regions where palolo occur deem the worm a delicacy.[14] During their short-lived annual appearance in the last quarter of the moon in October and November or in February (Lombok, Indonesia),[4][15] worms are gathered with nets or buckets, and are either eaten raw or cooked in several different ways.
In Samoa, the worms are revered as an excellent food source, hunting for them taking place seven days after the first full moon in October. Often bright blue in colour, the flavour is said to resemble a cross between mussels, abalone and oysters. They are sometimes eaten fresh, but usually fried with butter and onions and served with taroorbanana chips. The palolo harvest is part of the culture and tradition of Samoans, where the feast is shared with family and relatives, but in recent years has been sold in the markets of Apia and Salelologa for more than A$100 per kilogram.[7]
On the island of Lombok in Indonesia, a traditional event called the Nyale Festival, or Bau Nyale (meaning "to catch the sea worms[9]), is held between February and March. The event focuses on catching these worms, which are known as wawo.[10][9] In local legend, the nyale are believed to be the reincarnation of Princess Mandalika, who had jumped into the sea to drown herself.[16]
^ abCraig, P., ed. (2009). Natural History Guide to American Samoa(PDF) (3rd ed.). Pago Pago, American Samoa: National Park of American Samoa; Department Marine and Wildlife Resources. Archived from the original(PDF) on 24 January 2022. Retrieved 16 August 2009. This Guide may be available at: www.nps.gov/npsa
^Ley, Willy (October 1960). "The Moon Worm". For Your Information. Galaxy Science Fiction. pp. 56–66.
^Shulze and Timm, A. and L.E. (2012). "Palolo and un: distinct clades in the genus Palola (Eunicidae, Polychaeta)". Marine Biodiversity. 42 (2): 161–171. doi:10.1007/s12526-011-0100-5. S2CID12617958.
