Temporal range: Early Cretaceous–present
|Chanos chanos from French Polynesia|
|Milkfish (locally bangús) in a Philippine fish market|
The milkfish (Chanos chanos) is the sole living species in the family Chanidae. However, there are at least five extinct genera from the Cretaceous. The repeating scientific name (tautonym) is from Greek khanos (χάνος ‘mouth’).
The species has many common names. The Hawaiian name for the fish is awa, and in Tahitian it is ava. It is called bangús in the Philippines, where it is popularly known as the national fish, although the National Commission for Culture and the Arts has stated that this is not the case as it has no basis in Philippine law. In the Nauruan language, it is referred to as ibiya. Milkfish is also called bandeng or bolu in Indonesia.
Chanos chanos occurs in the Indian Ocean and across the Pacific Ocean, from South Africa to Hawaii and the Marquesas, from California to the Galapagos, north to Japan, south to Australia. Milkfishes commonly live in tropical offshore marine waters around islands and along continental shelves, at depths of 1 to 30 m. They also frequently enter estuaries and rivers.
The milkfish can grow to 1.80 m (5 ft 11 in), but are most often no more than 1 m (39 in) in length. They can reach a weight of about 14 kg (31 lb). and an age of 15 years. They have an elongated and almost compressed body, with a generally symmetrical and streamlined appearance, one dorsal fin, falcate pectoral fins and a sizable forked caudal fin. The head is small relative to the body. The mouth is small and toothless. The body is olive green, with silvery flanks and dark bordered fins. They have 13-17 dorsal soft rays, 8-10 anal soft rays and 31 caudal fin rays. There are numerous fine intramuscular bones, which may complicate human consumption of the fish (see "Consumption" below).
These fishes generally feed on algae and small invertebrates. They tend to school around coasts and islands with coral reefs. The young fry live at sea for two to three weeks and then migrate during the juvenile stage to mangrove swamps, estuaries, and sometimes lakes, and return to sea to mature sexually and reproduce. Females spawn at night up to 5 million eggs in saline shallow waters.
The milkfish is an important seafood in Southeast Asia and some Pacific Islands. Because it is notorious for being much bonier than other food fish, deboned milkfish, called "boneless bangús" in the Philippines, has become popular in stores and markets. Despite the notoriety however, many people in the Philippines continue to enjoy the fish cooked regularly or even raw using kalamansi juice or vinegar to make kinilaw na bangus.
Popular presentations of milkfish in Indonesia include bandeng duri lunak (soft-boned milkfish, ikan bandeng is Indonesian for milkfish) from Central and East Java or bandeng presto, which is pressure cooked milkfish until the thorns are rendered tender, and bandeng asap or smoked milkfish. Either fresh or processed, milkfish is the popular seafood product of Indonesian fishing towns, such as Juwana near Semarang in Central Java, and Sidoarjo near Surabaya in East Java.
Milkfish is the most popular fish in Taiwanese cuisine, it is valued for its versatility as well as its tender meat and economical price. Popular presentations include as a topping for congee, pan fried, braised, and as fish balls. There is a milkfish museum in Anping District and city of Kaohsiung holds an annual milkfish festival.
Milkfish aquaculture first occurred around 1800 years ago in the Philippines and spread to Indonesia, Taiwan, and into the Pacific. Traditional milkfish aquaculture relied upon restocking ponds by collecting wild fry. This led to a wide range of variability in quality and quantity between seasons and regions.
In the late 1970s, farmers first successfully spawned breeding fish. However, they were hard to obtain and produced unreliable egg viability. In 1980, the first spontaneous spawning happened in sea cages. These eggs were found to be sufficient to generate a constant supply for farms.
Fry are raised in either sea cages, large saline ponds (Philippines), or concrete tanks (Indonesia, Taiwan). Milkfish reach sexual maturity at 1.5 kg (3.3 lb), which takes five years in floating sea cages, but eight to 10 years in ponds and tanks. Once they reach 6 kg (13 lb), (eight years), 3–4 million eggs are produced each breeding cycle. This is mainly done using natural environmental cues. However, attempts have been made using gonadotropin-releasing hormone analogue (GnRH-A) to induce spawning. Some still use the traditional wild stock method — capturing wild fry using nets. Milkfish hatcheries, like most hatcheries, contain a variety of cultures, for example, rotifers, green algae, and brine shrimp, as well as the target species. They can either be intensive or semi-intensive. Semi-intensive methods are more profitable at US$6.67 per thousand fry in 1998, compared with $27.40 for intensive methods. However, the experience required by labour for semi-intensive hatcheries is higher than intensive. Milkfish nurseries in Taiwan are highly commercial and have densities of about 2000/L. Indonesia achieves similar densities, but has more backyard-type nurseries. The Philippines has integrated nurseries with grow-out facilities and densities of about 1000/L. The three methods of outgrowing are pond culture, pen culture, and cage culture.
- Shallow ponds are found mainly in Indonesia and the Philippines. These are shallow (30–40 centimetres (12–16 in)), brackish ponds with benthic algae, usually used as feed. They are usually excavated from nipa or mangrove areas and produce about 800 kg/ha/yr. Deep ponds (2–3 m) have more stable environments and their use began in 1970. They so far have shown less susceptibility to disease than shallow ponds.
- In 1979, pen culture was introduced in Laguna de Bay, which had high primary production. This provided an excellent food source. Once this ran out, fertilizer was applied. They are susceptible to disease.
- Cage culture occurs in coastal bays. These consist of large cages suspended in open water. They rely largely on natural sources of food.
Most food is natural (known as lab-lab) or a combination of phytoplankton and macroalgae. Traditionally, this was made on site; food is now made commercially to order. Harvest occurs when the individuals are 20–40 cm long (250–500 g in weight). Partial harvests remove uniformly sized individuals with seine nets or gill nets. Total harvest removes all individuals and leads to a variety of sizes. Forced harvest happens when an environmental problem occurs, such as depleted oxygen due to algal blooms, and all stock is removed. Possible parasites include nematodes, copepods, protozoa, and helminths. Many of these are treatable with chemicals and antibiotics.
Processing and marketing
Traditional post-harvest processing include smoking, drying, and fermenting. Bottling, canning, and freezing are of recent origin. Demand has been steadily increasing since 1950. In 2005, 595,000 tonnes were harvested worth US$616 million.
A trend toward value-added products is occurring. In recent years, the possibility of using milkfish juveniles as bait for tuna long-lining has started to be investigated, opening up new markets for fry hatcheries.
On April 21, 2012, a Filipino fisherman donated a milkfish with yellowish coloring to the Philippine Bureau of Fisheries and Aquatic Resources, which was later on called the "golden bangus". However, the fish soon died, allegedly because of a lower level of oxygen in the pond to which it was transferred.
- Freyhof, J.; Sparks, J.S.; Kaymaram, F.; Feary, D.; Bishop, J.; Al-Husaini, M.; Almukhtar, M.; Hartmann, S.; Alam, S.; Al-Khalaf, K. (2019). "Chanos chanos". IUCN Red List of Threatened Species. 2019: e.T60324A151598011. doi:10.2305/IUCN.UK.2019-2.RLTS.T60324A151598011.en. Retrieved 19 November 2021.
- Eschmeyer, W. N.; R. Fricke, eds. (4 January 2016). "Catalog of Fishes". California Academy of Sciences. Retrieved 25 January 2016.
- Froese, Rainer, and Daniel Pauly, eds. (2015). "Chanidae" in FishBase. October 2015 version.
- Nelson, J. S. (2006). Fishes of the World (4th ed.). Hoboken, NJ: John Wiley & Sons. pp. 135–136. ISBN 978-0-471-25031-9.
- "Chanidae". Merriam-Webster Dictionary. “from Greek chanos mouth”
- David Starr Jordan; et al. (1896). The Fishes of North and Middle America, pt. 1. Government Printing Office. p. 414. OCLC 1052833.
from χάνος, the open mouth
- Pangilinan, Jr., Leon (3 October 2014). "In Focus: 9 Facts You May Not Know About Philippine National Symbols". National Commission for Culture and the Arts. Retrieved 8 January 2019.
- Froese, Rainer; Pauly, Daniel (eds.) (2015). "Chanos chanos" in FishBase. October 2015 version.
- Atbp (2017-01-20). "Kilawin na Bangus (Milkfish Ceviche)". ATBP. Retrieved 2020-03-24.
- Hiufu Wong, Maggie. "40 of the best Taiwanese foods and drinks". www.cnn.com. CNN. Retrieved 29 September 2020.
- "Chanos chanos (Forsskal, 1775)". Cultured Aquatic Species Information Programme. FAO Fisheries and Aquaculture Department.
- "Milkfish (Bangus) Breeding and Fry Hatchery Technology". Archived from the original on 2013-12-13. Retrieved 2010-09-12.
- Milkfish (Bangus) Breeding and Fry Hatchery Technology
- "Aquaculture Profile of Chanos chanos".
- Lee, C.-S.; Leung, P.-S.; Su, M.-S. (1997). "Bioeconomic evaluation of different fry production systems for milkfish (Chanos chanos)". Aquaculture. 155 (1–4): 367–376. doi:10.1016/S0044-8486(97)00104-X.
- Gapasin, R.S.J; Bombeo, R; Lavens, P; Sorgeloos, P; Nelis, H (1998). "Enrichment of live food with essential fatty acids and vitamin C: effects on milkfish (Chanos chanos) larval performance". Aquaculture. 162 (3–4): 269–286. doi:10.1016/S0044-8486(98)00205-1.
- FitzGerald, William J. (2004). Milkfish aquaculture in the Pacific: potential for the tuna longline fishery bait market (PDF). Noumea, New Caledonia: Secretariat of the Pacific Community.
- "Fisheries bureau releases golden milkfish".
- "Plan to breed 'golden' bangus dies with lone specimen".
- Francisco José Poyato-Ariza, A revision of the ostariophysan fish family Chanidae, with special reference to the Mesozoic forms (Verlag Dr. Friedrich Pfeil, 1996)
- Bagarinao, T., 1994. Systematics, distribution, genetics and life history of milkfish, Chanos chanos. Environ. Biol. Fish. 39(1):23-41.
- Media related to Chanos chanos at Wikimedia Commons
- Data related to Chanos chanos at Wikispecies
- Boneless Bangus
- FishBase entry for milkfish
- SEAFDEC milkfish hatchery info
- DA, Philippines, About Bangus
- Photos of Milkfish on Sealife Collection