Pacu

This article is about several fish species commonly called "pacu". For individual species or other uses, see Pacu (disambiguation).
Pacu
Large pacu (Serrasalminae) at the Shedd Aquarium
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Characiformes
Family: Characidae
Subfamily: Serrasalminae

Pacu (Portuguese pronunciation: [paˈku]) is a common name used in the aquarium trade to refer to several common species of omnivorous South American freshwater fish that are related to the piranha. Pacu and piranha do not have similar teeth, the main difference being jaw alignment; piranha have pointed, razor-sharp teeth in a pronounced underbite, whereas pacu have squarer, straighter teeth, which are uncannily similar to human teeth, and a less severe underbite, or a slight overbite.[1] Pacu, unlike some types of piranha, actually feed on plants and not flesh.[2] Additionally, full-grown pacu are much larger than piranha, reaching up to 0.9 m (3.0 ft) and 25 kg (55 lb) in the wild.

Pacu is a term of Brazilian Indian/Guaraní origin. When the large fish of the Colossoma genus entered the aquarium trade in the U.S. and other countries, they were erroneously labeled pacu. In the Brazilian Amazon, the term pacu is generally reserved to smaller and medium-sized fish in the Metynnis, Mylossoma, Mylesinus and Myleus genera. The Colossoma macropomum fish are known as tambaqui, whereas Piaractus brachypomus is known as pirapitinga. In Perú, both of the species (Colossoma macropomum and Piaractus brachypomum) are called pacú and gamitana. In Rio Paraná/Paraguay there is Piaractus mesopothamicus, which is also called "pacú" in Paraguay.

Classification

Colossoma macropomum (Black Pacu), at the New England Aquarium.

Pacu, along with their piranha cousins, are a characin fish, meaning a kind of tetra, belonging to the Characiformes order. The ongoing classification of these fish is difficult and often contentious, with ichthyologists basing ranks according to characteristics that may overlap irregularly (see Cladistics). DNA research sometimes confounds rather than clarifies species ranking. Ultimately, classifications can be rather arbitrary.[3]

Pacu, along with piranha, are currently further classified into the Serrasalminae subfamily. Serrasalminae means "serrated salmon family" and is a name which refers to the serrated keel running along the belly of these fish. However, dental characteristics and feeding habits further separate the two groups from each other.[3]

The common name pacu is generally applied to fish classified under the following genera:[4]

Each of these groups contain one or more separate species. For example, the fish often found in pet stores known as the "Black Pacu" and the "Red-bellied Pacu" belong to the species Colossoma macropomum and Piaractus brachypomus, respectively. A species popular among aquaculturists is the Piaractus mesopotamicus, also known as "Paraná River Pacu".[5]

Pacu with humanoid teeth

Location and habitat

Pacus inhabit most rivers and streams in the Amazon and Orinoco river basins of lowland Amazonia, where they form part of the highly diverse Neotropical fish fauna. They have also recently been found in the riverine systems of Papua New Guinea, where it is believed the fish has been introduced to aid the local fishing industry, but has in fact been responsible for devastating the ecosystem of the Sepik River. In August 2013 a pacu was discovered in Scandinavian waters; a fisherman pulled a 21 cm (8.5 in) specimen from Øresund Sound off Sweden's south coast.[6] An angler fishing on the river Seine in Paris, France caught a pacu on 30 August 2013.[7] An angler fishing on the California Delta, near Stockton, Cailfornia, also caught a pacu on August 16, 2015.[8] Three pacu have been reported in the Great Lakes, Lake Michigan, as of August 2016.[9]

Importance to humans

Aquaria

Red Pacu

Pacu are commonly sold as "Vegetarian Piranhas" to home aquarium owners. With the proper equipment and commitment, pacu have been known to make responsive pets. One such example was Swish, a 75-cm (30-inch) pacu owned for over 20 years by a Chinese restaurant (Kau Kau) in the Chinatown district in Seattle, Washington; one aquarium technician said of Swish, "He'd rub his body on your arms, kind of like a dog."[10]

However, there is some question of whether the fish are a good choice for the typical hobbyist. While they are not aggressive carnivores like the piranha, their crushing jaw system, used primarily for eating seeds and nuts, can be hazardous. One toddler needed surgery after a pacu (misreported as a piranha) bit her finger at Edinburgh Butterfly and Insect World in Scotland. Commenting on the incident, Deep Sea World zoological manager Matthew Kane warned, "Pacus will eat anything, even children's wiggling fingers."[11]

If a large population of pacu enters an ecosystem to which it is not native, the fish can have a very adverse effect. Pet stores sell pacu as small as 5–8 cm (2–3 in) long and neglect to warn customers that fish growth is not inhibited by tank size, contrary to popular fish lore.[4] "Most UK dealers now refuse to stock this species due to the large size and expensive aquarium requirements it demands," according to Practical Fishkeeping magazine's Matt Clarke.[12] Incapable of maintaining large aquaria, overwhelmed hobbyists are suspected of illegally releasing their pacu into wild waterways. As tropical fish, pacu will die in cold weather; as newcomers to an ecosystem, pacu may out-compete native species for available food, habitat, and other resources, or displace them by introducing exotic parasites or diseases. Most wildlife resource authorities prohibit releasing exotic fish, including pacu, into the wild. Officials of one Texas lake have put a $100 bounty on the pacu caught there.[13]

As exotic species

In the United States

Discoveries in the United States have been reported in Alabama,[14] Arizona,[15] Arkansas,[1] California,[16] Colorado,[17] Florida,[18] Georgia,[19] Iowa, Idaho,[20] Illinois,[21] Indiana,[22] Kentucky,[23] Maine,[24] Maryland,[25] Massachusetts,[26] Michigan,[27] Minnesota,[28] Missouri,[29] Nebraska,[30] New Hampshire,[31] New Jersey,[32] North Carolina,[33] North Dakota,[34] Ohio,[35][36] Oklahoma,[37] Pennsylvania,[38] South Carolina,[39] Texas,[40][41][42] Utah,[43] Washington,[44]Wisconsin,[45] and Wyoming.[46][47] Some state wildlife authorities have advised home aquarists who wish to get rid of overgrown pacu to cut the heads off the fish and dispose of them as garbage.[45] However, Habitattitude, a U.S. national initiative led by the Aquatic Nuisance Species (ANS) Task Force, recommends humanely disposing the fish through a veterinarian or pet retailer, returning them to retailers, or donating them to a local aquarium society, school, or aquatic business.[48] Additionally, aquarium-raised fish can be eaten (see note in Food fish for cautions and instructions).[49]


A pacu, also known as Tambaqui, for sale in the Manaus Fish Market, Brazil. Photographer Thorke Østergaard noted that this fish was approximately 85 cm (33.5 in) long.

In New Guinea

Pacu were introduced in 1994 to the Sepik River, and in 1997 to the Ramu river as a food source, due to overfishing of native species. Local people blame the fish for outcompeting native species, including juvenile crocodiles, as well as for several attacks on humans. As a primarily vegetarian fish, red bellied Pacu, have also consumed the floating mats of vegetation in the Sepik River, which operated as fish nurseries and crocodile and bird nesting sites. Thus the entire ecosystem has become impoverished and local people cannot subsist as easily as they once did. [50]

Game fish

In Appendix B of Through the Brazilian Wilderness[51] (see also online version[52]), Theodore Roosevelt advised, "For small fish like the pacu and piranha an ordinary bass hook will do." Concerning the pacu, he added:

"A light rod and reel would be a convenience in catching the pacu. We used to fish for the latter variety in the quiet pools while allowing the canoe to drift, and always saved some of the fish as bait for the big fellows. We fished for the pacu as the native does, kneading a ball of mandioc farina with water and placing it on the hook as bait. I should not be surprised, though, if it were possible, with carefully chosen flies, to catch some of the fish that every once in a while we saw rise to the surface and drag some luckless insect under."

More recently, South American rivers including the Amazon have become a popular destination for recreational anglers, who go to fly fish for pacu. The International Game Fishing Organization has sponsored fly-fishing courses for native Brazilian fishermen, typically accustomed to subsistence fishing, so they can work as guides to fishing tourists.[53]

When bait-fishing in pacu-stocked ponds, anglers in Malaysia are advised to use circle hooks, size 2 or larger, and braided leather rather than nylon leaders which are easily broken by the pacu's teeth. Since pond pacu often nibble at the bait before taking it, anglers should let them swim away with the bait. If the angler simply allows the line to tighten, the circle hook will slide to the side of the fish's mouth and embed its point there.[54]

Grilled pacu over rice with sides of lettuce, tomato, onions, and plantains, with a lemon-half garnish.
Photograph taken in Villa Tunari, Bolivia, by Marc Alan Davis.

Food fish

Theodore Roosevelt wrote of catching and eating pacu in his book Through the Brazilian Wilderness.[51][52] He described them as "good-sized, deep-bodied fish," and noted, "They were delicious eating."

Today, the Amazon river is experiencing a crisis of overfishing. Both subsistence fishers and their commercial rivals compete in netting large quantities of pacu, which bring good prices at markets in Brazil and abroad.[55]

Aquaculture may relieve the overfishing crisis, as well as improve food security by boosting fish supplies. Various species of pacu are increasingly being used for warm-water farm fishing around the world.[56] Pacu are considered ideal for their tolerance of the low-oxygen water in farm ponds. They also don't require a lot of expensive protein in their diet, and can be raised year-round in warm or temperature-controlled environments.[57]

Research shows that the "flavor of [farmed] pacu is comparable to that of hybrid striped bass, tilapia, and rainbow trout, but superior to catfish."[58] In South America, pacu are prized for their sweet, mild flavor.

Aquarium-raised pacu can be cooked and eaten, but care should be taken to ensure that no toxic medications were used in the aquarium.[4] Heather Candelaria provides a recipe and preparation instructions on the Greater Seattle Aquarium Society's Web site.[49][59]

Incorrect claim of testicle-biting

In 2013, a pacu specimen was found by a fisherman in Denmark.[60] This led to media reports mistakenly warning that the fish could attack testicles. The reports were based on a joke that was not meant to be taken seriously.[60]

References

  1. 1 2 Lucariello, Kathryn (2006-07-13). "Toothy fish caught on White River is piranha cousin". Carroll County News, Eureka Springs, Arkansas.
  2. ↑ Walters, Martin; Johnson, Jinny (2003). Encyclopedia of Animals. Marks and Spencer p.l.c. p. 113. ISBN 1-84273-964-6.
  3. 1 2 Magallanes, Frank (2006-04-06). "Subfamily Serrasalminae" (Website). Oregon Piranha Exotic Fish Exhibit.
  4. 1 2 3 Magallanes, Frank (2006-04-06). "Pacu, Tambaqui, Piratinga, Silver Dollars" (Website). Oregon Piranha Exotic Fish Exhibit.
  5. ↑ "Swedish men told to beware testicle-munching fish". Retrieved 12 August 2013.
  6. ↑ http://www.timesofmalta.com/articles/view/20130812/odd-news/male-skinny-dippers-warned-of-ball-cutter-fish.481788
  7. ↑ "Testicle-Biting Fish Caught Near Paris". The Huffington Post. 2013-09-03. Retrieved 2016-08-13.
  8. ↑ Woman Nabs Rare Pacu While Fishing, retrieved 2016-08-13
  9. ↑ "Fish With 'Human-Like Teeth' Found Swimming in Two Michigan Lakes". KTLA. 2016-08-11. Retrieved 2016-08-13.
  10. ↑ Davila, Florangela (2006-10-14). "Chinatown fixture Swish was "part of the family"". The Seattle Times.
  11. ↑ Edwards, Gareth (2004-06-12). "Girl needs surgery for piranha bite to finger". Scotsman.com, Scotland.
  12. ↑ Clarke, Matt (2005-08-10). "Angler catches fruit-eating piranha". Practical Fishkeeping, Peterborough UK. Archived 2 September 2009 at the Wayback Machine.
  13. ↑ {Carpet Aquarium Plants}
  14. ↑ Hindmond, Jade (2006-10-26). "Fish Thought To Be Record Bream Is A Pacu". WTVM News, Columbus, Georgia.
  15. ↑ "Woman catches piranha relative in Yuma area". azcentral.com (Associated Press). 2006-07-10.
  16. ↑ "Piranha in Lake Don Pedro? Fish Find Flusters Fishermen". News10.net, Sacramento, California. 2009-010-08. Check date values in: |date= (help)
  17. ↑ "Foreign Creature Found In Cherry Creek Reservoir". TheDenverChannel.com, Denver, Colorado. 2006-07-12.
  18. ↑ "So-called testicle-eating fish found in Sarasota waters". MySuncoast.com, Sarasota, Florida. 2014-07-17.
  19. ↑ "Georgia DNR".
  20. ↑ "Pirhanna-like Fish Caught in Lake Lowell". 2news.tv, Nampa, Idaho. 3 August 2007. Archived from the original on 28 September 2007.
  21. ↑ "Lake Michigan pacu: A historical perspective". Chicago Sun-Times. 17 August 2009. Archived from the original on 13 July 2012.
  22. ↑ "Lafayette man catches piranha in Wabash". indystar.com, Indianapolis, Indiana. 2009-08-24. Archived 27 August 2009 at the Wayback Machine.
  23. ↑ Fuller, Pam (2007-10-11). "Piaractus brachypomus. USGS Nonindigenous Aquatic Species Database". U.S. Department of the Interior — U.S. Geological Survey , Gainesville, Florida. Retrieved 2010-07-28.
  24. ↑ "MDIFW: Illegal Pacu Captured in Limestone Brook; Man Charged". Maine Department of Inland Fisheries and Wildlife, Augusta, Maine. 2010-07-27.
  25. ↑ Thomson, Candus (2006-09-30). "Dundalk fish tale loses its bite: Experts conclude catch in local pond is pacu, not piranha". The Baltimore Sun, Baltimore, Maryland.
  26. ↑ "Rare Fish With Teeth Caught In North Attleboro". CBS4Boston.com, Boston, Massachusetts. 2006-07-27.
  27. ↑ "Pacu Caught In Local Lake". ClickOnDetroit.com. 20 August 2007. Archived from the original on 26 August 2007.
  28. ↑ "Lifelong St. Croix River angler reels in a big surprise". Pioneer Press, St. Croix, Minnesota. 2006-07-09. Archived 14 November 2007 at the Wayback Machine.
  29. ↑ "Man Catches Pacu Fish In Mississippi". 2006-07-28.
  30. ↑ "Amazon River fish caught in western Nebraska lake". Omaha World Herald, Nebraska. 2008-09-16.
  31. ↑ "Frightening Fish Doesn't Have Piranha's Bite". NBC10 Philadelphia, Pennsylvania. 2005-08-09.
  32. ↑ "Man Hooks Piranha's Cousin in NJ Lake". WMUR, New Hampshire. 2013-09-24.
  33. ↑ "Wildlife Experts Don't Bite On Tale Of Piranha In Lake Gaston". WRAL.com, Raleigh-Durham and Fayetteville, North Carolina. 2006-09-27.
  34. ↑ Fundingsland, Kim (2006-09-01). "South American freshwater fish caught at Patterson Lake". The Minot Daily News, Minot, North Dakota.
  35. ↑ "Boy Hooks Piranha-Like Fish From Ohio River". WLWT News, Cincinnati. 4 June 2007. Archived from the original on 6 June 2007.
  36. ↑ "Ten Year-Old Catches Toothy Fish". KDSK.com, St. Louis, Missouri. 2007-06-04.
  37. ↑ "Experts Say Fish Resembling Piranha is a Pacu". KOSU, Oklahoma Public Radio (Associated Press). 2001-07-24.
  38. ↑ Weisberg, Deborah (2006-08-01). "Local fisherman reels in a piranha". Pittsburgh Post-Gazette, Pittsburgh, Pennsylvania.
  39. ↑ Robinson, Ben (3 April 2009). "Piranha caught in Lake Keowee". The Pickens Sentinel, Pickens, South Carolina. Archived from caught in Lake Keowee the original Check |url= value (help) on 2 September 2009.
  40. ↑ "Piranha sub-species caught in East Texas lake". 2012-03-14.
  41. ↑ Godwin, Joyce (2006-09-03). "Exotic fish caught in Lake Texoma". Herald Democrat, Texoma, Texas.
  42. ↑ "Texas Man Catches Fish With Human-like Teeth". Local6.com, Lubbock, Texas. 2006-07-19.
  43. ↑ "Piranha-like fish caught in Utah Lake was a pacu". The Salt Lake Tribune (Associated Press), Salt Lake City, Utah. 2006-07-12.
  44. ↑ Davis, Jim (2013-08-05). "Exotic fish caught in lake near Marysville". The Everett Herald.
  45. 1 2 Lamb, Bob (14 July 2006). "Wrong type fish biting: Man catches exotic Pacu from Black River". La Crosse Tribune, La Crosse, Wisconsin. Archived from the original on 3 May 2015. Retrieved 2015-05-03.
  46. ↑ Matteson, Cory (2006-09-24). "A Brazilian fish out of water". Casper Star Tribune, Casper, Wyoming.
  47. ↑ state=Florida title=Fish Caught in Deltona Lake Was a Pacu not a Piranha date=09/07/2010 publisher=Orlando Sentinel first=Tom last=Cornell url=http://articles.orlandosentinel.com/2010-09-07/news/os-was-piranha-found-deltona-lake-20100907_1_pacu-piranha-dupont-lake
  48. ↑ "Habitattitude" (Website). An Aquatic Nuisance Species (ANS) Task Force initiative sponsored by the United States Fish and Wildlife Service.
  49. 1 2 Candelaria, Heather (January 1999). "To Serve Fish" (Website). Greater Seattle Aquarium Society, Seattle, Washington.
  50. ↑ http://animal.discovery.com/fish/river-monsters/red-bellied-pacu.html
  51. 1 2 Roosevelt, Theodore (1914). Through the Brazilian Wilderness. New York: Charles Scribner's Sons. ISBN 0-8154-1095-6.
  52. 1 2 Roosevelt, Theodore. "Through the Brazilian Wilderness". New York: Bartleby.com (2000). Retrieved 2006-07-22.
  53. ↑ Valerio da Costa, Marco (16 March 2006). "Fishing Adventures along the Xingu River – Pará, Brazil". AnglersNet.co.uk. Retrieved 2006-07-22.
  54. ↑ Malek, Aznir; Anthony Geoffrey (7 October 2006). "Hooking the fish". The Star, Malaysia. Archived from the original on 2 September 2009.
  55. ↑ Rohter, Larry (26 October 2004). "Big Fish, Little Fish Battle Over the Amazon's Bounty". New York Times.
  56. ↑ "Scientists dispel fears of piranha invasion in Cat Tien Reserve". Viêt Nam News: The National English Language Daily, Vietnam. 30 June 2003. Archived from the original on 16 July 2006.
  57. ↑ Kulier, Jennifer (Fall 2000). "Farming with Fins". Perspectives. Southern Illinois University, Carbondale. Archived from the original on 14 October 2006. Retrieved 2006-07-22.
  58. ↑ Sharma V. S. Pullela (3 February 1997). "Aquaculture of Pacu (Piaractus mesopotamicus) and a Comparison of Its Quality: Microbiological, Sensory and Proximate Composition" (PDF). Virginia Polytechnic Institute and State University. Retrieved 2006-07-22.
  59. ↑ http://www.gsas.org/Articles/1999/to-server-fish.html
  60. 1 2 Gray, Melissa (16 August 2013). "Warning over testicle-biting fish in Denmark? It's all wet". CNN. Retrieved 8 September 2013.
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