Pink salmon

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Pink salmon
Humpback Salmon Adult Male.jpg
Male ocean phase pink salmon
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Salmoniformes
Family: Salmonidae
Genus: Oncorhynchus
Species:
O. gorbuscha
Binomial name
Oncorhynchus gorbuscha
(Walbaum, 1792)
Male spawning phase pink salmon Pink salmon FWS.jpg
Male spawning phase pink salmon
Male pink salmon caught by a fly fisherman in its freshwater spawning phase PinkSalmon1.jpg
Male pink salmon caught by a fly fisherman in its freshwater spawning phase
Pink salmon spawning in the Indian River, Sitka, AK, September 2018 Sitka spawning salmon 180906.jpg
Pink salmon spawning in the Indian River, Sitka, AK, September 2018

Pink salmon or humpback salmon (Oncorhynchus gorbuscha) is a species of euryhaline ray-finned fish in the family Salmonidae. It is the type species of the genus Oncorhynchus (Pacific salmon), and is the smallest and most abundant of the seven officially recognized species of salmon. The species' scientific name is based on the Russian common name for this species gorbúša (горбуша), which literally means humpie.

Contents

Description

In the ocean, pink salmon are bright silver fish. After returning to their spawning streams, their coloring changes to pale grey on the back with yellowish-white belly (although some turn an overall dull green color). As with all salmon, in addition to the dorsal fin, they also have an adipose fin. The fish is characterized by a white mouth with black gums, no teeth on the tongue, large oval-shaped black spots on the back, a v-shaped tail, and an anal fin with 13–17 soft rays. During their spawning migration, males develop a pronounced humped back, hence their nickname "humpies". Pink salmon average 4.8 pounds (2.2 kg) in weight. [1] The maximum recorded size was 30 inches (76 cm) and 15 pounds (6.8 kg). [2]

Distribution

The native range of the species is in the Pacific and Arctic coastal waters and rivers, from the Sacramento River in northern California to the Mackenzie River in Canada; and in the west from the Lena River in Siberia to Korea and Honshu in Japan. In North America, pink salmon spawn from the Mackenzie River in the Arctic [3] to as far south as tributaries of Puget Sound, Washington, although they were also reported in the San Lorenzo River near Santa Cruz, California in 1915, [4] and the Sacramento River in northern California in the 1950s. [5] In 2013, a new record for the southernmost extent of spawning pink salmon was published for the Salinas River. [6] In the fall of 2017, a dozen pink salmon were counted in Lagunitas Creek about 25 miles (40 km) north of San Francisco, California. [7]

Pink salmon were introduced into the Great Lakes of North America, where there are now self-sustaining populations, [8] and in Iran.[ citation needed ] In Europe, pink salmon have been periodically introduced to rivers of the White Sea and Barents Sea basins in Russia since 1956. Stray fish from these rivers have been encountered ascending to rivers also in Norway, Sweden, Ireland, Great Britain, and Iceland; and, in Norway, even self-sustaining populations have been observed. [9] In 2017, larger numbers than usual of this species were caught in rivers in Scotland and spawning was recorded. [10] In 2021, they were reported to have invaded Akerselva in downtown Oslo, the capital of Norway. [11]

Ecology

Habitat

Pink salmon are coldwater fish with a preferred temperature range of 5.6 to 14.6 °C, an optimal temperature of 10.1 °C, and an upper incipient lethal temperature of 25.8 °C.

Reproduction

Pink salmon in their native range have a strict two year life cycle, thus odd and even-year populations do not interbreed. In the state of Washington, pink salmon runs occur on odd years. [12] Adult pink salmon enter spawning streams from the ocean, usually returning to the stream where they originated. Spawning occurs between late June and mid-October, in coastal streams and some longer rivers, and in the intertidal zone or at the mouth of streams if hyporheic freshwater is available. Using her tail, the female digs a trough-shaped nest, called a redd or rede (Scandinavian word for "nest"), in the gravel of the stream bed, where she deposits her eggs. As she expels the eggs, she is approached by one or more males, which fertilize them as they fall into the redd. Subsequently, the female covers the newly deposited zygotes, again with thrusts of her tail, against the gravel at the top of the redd. The female lays from 1,000 to 2,000 eggs in several clutches within the redd, often fertilized by different males. Females guard their redds until death, which comes within days of spawning. In dense populations, a major source of mortality for embryos is a superposition of redds by later-spawning fish. The eggs hatch from December to February, depending on water temperature, and the juveniles emerge from the gravel during March and April and quickly migrate downstream to estuaries, at about one-quarter gram in weight. The fish achieve sexual maturity in their second year of life. They return to freshwater in the summer or autumn as two-year-old adults.

Diet

In their freshwater stage, juvenile pink salmon consume invertebrates and zooplankton. In the ocean, they feed on a variety of plankton, invertebrates, and small fish. [13] Adults do not feed as they return to freshwater to spawn.

Predators and trophic interactions

Many different animals feed on pink salmon throughout their life cycle, from small fish, birds, and mammals in freshwater ecosystems when the salmon are eggs or fry, through large fish, seabirds, and marine mammals when they are in the ocean. [14]

Eggs and the carcasses of spawned salmon adults can provide substantial nutrient subsidies to freshwater food webs. Where pink salmon are expanding into subarctic Norwegian rivers, their eggs are consumed by native salmonids. [15] In the Keogh River in Canada, higher numbers of pink salmon eggs were shown to reduce competition among other fish species relying on this food source. [16] Bears feed on adult migrating salmon, and choose to prey on salmon which have not yet spawned and thus are more nutritious, when they have a choice. [17] Many of the pink salmon that are caught by bears in Alaska are transported away from the water into riparian areas and forests, [18] and nutrients from the carcasses end up in plants and trees. [19] Carcasses of pink salmon that successfully spawn decompose rapidly, and are colonized by aquatic invertebrates in the process. [20] These resource subsidies to stream habitats can increase the growth of other salmonid species in the streams. [21]

Conservation status

NatureServe lists the pink salmon as critically imperiled in California, and imperiled in Washington. In Alaska and British Columbia, they are considered secure. [22] No pink salmon Evolutionary Significant Units are listed under the Endangered Species Act.

Fisheries and use

Alaskan pink salmon in its freshwater spawning phase. Pink Salmon (3)editresize (16273595915).jpg
Alaskan pink salmon in its freshwater spawning phase.
Global capture production of Pink(=Humpback) salmon (Oncorhynchus gorbuscha) in thousand tonnes from 1950 to 2022, as reported by the FAO Pink(=humpback) salmon, capture production, thousand tonnes, 1950-2022.svg
Global capture production of Pink(=Humpback) salmon (Oncorhynchus gorbuscha) in thousand tonnes from 1950 to 2022, as reported by the FAO

The commercial harvest of pink salmon is a mainstay of fisheries of both the eastern and western North Pacific. In 2010, the total harvest was some 260 million fish, corresponding to 400,000 tonnes. Of this, 140 million fish were from Russian fisheries and 107 million from the USA (Alaska). [24] Pink salmon account for 69% of the total Russian salmon fisheries. [25] The majority of pink salmon are harvested using coastal set net traps, and the fisheries are concentrated on the east coast of Sakhalin (average 110,000 tonnes per year). [26]

In North America, beginning in the late 19th century fish traps were used to supply fish for commercial canning and salting. The industry expanded steadily until 1920. During the 1940s and 1950s, pink salmon populations declined drastically. Fish traps were prohibited in Alaska in 1959. Now, most pink salmon are taken with purse seines, drift nets or gillnets. Populations and harvests increased rapidly after the mid-1970s and have been at record high numbers since the 1980s.

More than 20 million harvested pink salmon are produced by fishery-enhancement hatcheries, particularly in the northern Gulf of Alaska. [27] Pink salmon are not grown in significant numbers in fish farms. The fish are often canned, smoked or salted. Pink salmon roe is also harvested for caviar, a particularly valuable product in Asia. There is some evidence the pink salmon fishery industry may be having an impact on the size of pink salmon & other salmon species as well as the abundance of species that compete for and serve as their food sources. [28] [29]

Related Research Articles

<span class="mw-page-title-main">Salmon</span> Commercially important migratory fish

Salmon is the common name for several commercially important species of euryhaline ray-finned fish from the genera Salmo and Oncorhynchus of the family Salmonidae, native to tributaries of the North Atlantic (Salmo) and North Pacific (Oncorhynchus) basins. Other closely related fish in the same family include trout, char, grayling, whitefish, lenok and taimen, all coldwater fish of the subarctic and cooler temperate regions with some sporadic endorheic populations in Central Asia.

<span class="mw-page-title-main">Trout</span> Freshwater fish from subfamily Salmoninae

Trout is a generic common name for numerous species of carnivorous freshwater ray-finned fishes belonging to the genera Oncorhynchus, Salmo and Salvelinus, all of which are members of the subfamily Salmoninae in the family Salmonidae. The word trout is also used for some similar-shaped but non-salmonid fish, such as the spotted seatrout/speckled trout.

<i>Oncorhynchus masou</i> Species of salmon

The masu salmon, also known as masu or cherry trout in Japan, is a species of salmonid belonging to the genus Oncorhynchus, found in the North Pacific along Northeast/East Asian coasts from the Russian Far East to south through Korea, Japan and Taiwan. Although generally accepted as a salmon in the West, the fish is actually regarded as a trout in Japan as it is the most commonly seen freshwater salmonid in the Japanese archipelago.

<span class="mw-page-title-main">Salmon run</span> Annual migration of salmon

A salmon run is an annual fish migration event where many salmonid species, which are typically hatched in fresh water and live most of their adult life downstream in the ocean, swim back against the stream to the upper reaches of rivers to spawn on the gravel beds of small creeks. After spawning, all species of Pacific salmon and most Atlantic salmon die, and the salmon life cycle starts over again with the new generation of hatchlings.

<span class="mw-page-title-main">Rainbow trout</span> Fresh-water species of fish

The rainbow trout is a species of trout native to cold-water tributaries of the Pacific Ocean in North America and Asia. The steelhead is an anadromous (sea-run) form of the coastal rainbow trout(O. m. irideus) or Columbia River redband trout (O. m. gairdneri) that usually returns to freshwater to spawn after living two to three years in the ocean. Freshwater forms that have been introduced into the Great Lakes and migrate into tributaries to spawn are also called steelhead.

Steelhead, or occasionally steelhead trout, is the anadromous form of the coastal rainbow trout (Oncorhynchus mykiss irideus) or Columbia River redband trout. Steelhead are native to cold-water tributaries of the Pacific basin in Northeast Asia and North America. Like other sea-run (anadromous) trout and salmon, steelhead spawn in freshwater, smolts migrate to the ocean to forage for several years and adults return to their natal streams to spawn. Steelhead are iteroparous, although survival is only approximately 10–20%.

<span class="mw-page-title-main">Chum salmon</span> Species of fish

The chum salmon, also known as dog salmon or keta salmon, is a species of anadromous salmonid fish from the genus Oncorhynchus native to the coastal rivers of the North Pacific and the Beringian Arctic, and is often marketed under the trade name silverbrite salmon in North America. The English name "chum salmon" comes from the Chinook Jargon term tsəm, meaning "spotted" or "marked"; while keta in the scientific name comes from Russian, which in turn comes from the Evenki language of Eastern Siberia. The term 'Dog Salmon' is most commonly used in Alaska and refers to the Salmon whose flesh Alaskans use to feed their dogs.

<span class="mw-page-title-main">Chinook salmon</span> Species of fish

The Chinook salmon is the largest and most valuable species of Pacific salmon. Its common name is derived from the Chinookan peoples. Other vernacular names for the species include king salmon, Quinnat salmon, Tsumen, spring salmon, chrome hog, Blackmouth, and Tyee salmon. The scientific species name is based on the Russian common name chavycha (чавыча).

<span class="mw-page-title-main">Sockeye salmon</span> Species of fish

The sockeye salmon, also called red salmon, kokanee salmon, blueback salmon, or simply sockeye, is an anadromous species of salmon found in the Northern Pacific Ocean and rivers discharging into it. This species is a Pacific salmon that is primarily red in hue during spawning. They can grow up to 84 cm in length and weigh 2.3 to 7 kg (5–15 lb). Juveniles remain in freshwater until they are ready to migrate to the ocean, over distances of up to 1,600 km (1,000 mi). Their diet consists primarily of zooplankton. Sockeye salmon are semelparous, dying after they spawn. Some populations, referred to as kokanee, do not migrate to the ocean and live their entire lives in fresh water.

<span class="mw-page-title-main">Coho salmon</span> Species of fish

The coho salmon is a species of anadromous fish in the salmon family and one of the five Pacific salmon species. Coho salmon are also known as silver salmon and is often sold as medium red salmon. The scientific species name is based on the Russian common name kizhuch (кижуч).

<i>Oncorhynchus</i> Genus of fishes

Oncorhynchus is a genus of ray-finned fish in the subfamily Salmoninae of the family Salmonidae, native to coldwater tributaries of the North Pacific basin. The genus contains twelve extant species, namely six species of Pacific salmon and six species of Pacific trout, all of which are migratory mid-level predatory fish that display natal homing and semelparity.

Puget Sound salmon recovery is a collective effort of federal, state and local authorities and non-profit coalitions of universities, scientists, business and industry aimed at restoring Pacific salmon and anadromous forms of Pacific trout (Oncorhynchus) within the Puget Sound region. The Puget Sound lies within the native range of the Pacific Salmon (Oncorhynchus) and two sea-run forms of Pacific trout, the coastal rainbow trout or steelhead and coastal cutthroat trout. Populations of Oncorhynchus have seen significant declines since the middle of the 19th century due to over fishing, habitat loss, pollution and disease. Salmon species residing in or migrating through the Puget Sound to spawning streams include Chum, Coho, Chinook, Sockeye, and Pink salmon. Pacific salmon require freshwater rivers for spawning and most major tributaries of the Puget Sound have salmon, steelhead and cutthroat trout spawning runs.

<span class="mw-page-title-main">Pacific lamprey</span> Species of jawless fish

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<span class="mw-page-title-main">Coastal cutthroat trout</span> Subspecies of fish

The coastal cutthroat trout, also known as the sea-run cutthroat trout, blue-back trout or harvest trout, is one of the four species of cutthroat trout found in Western North America. The coastal cutthroat trout occurs in four distinct forms. A semi-anadromous or sea-run form is the most well known. Freshwater forms occur in both large and small rivers and streams and lake environments. The native range of the coastal cutthroat trout extends south from the southern coastline of the Kenai Peninsula in Alaska to the Eel River in Northern California. Coastal cutthroat trout are resident in tributary streams and rivers of the Pacific basin and are rarely found more than 100 miles (160 km) from the ocean.

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<span class="mw-page-title-main">Environmental issues with salmon</span>

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Pre-spawn mortality is a phenomenon where adult coho salmon, Oncorhynchus kisutch, die before spawning when returning to freshwater streams to spawn. It is also known as Urban Runoff Mortality Syndrome in more recent studies. This occurrence has been observed in much of the Puget Sound region of the Pacific Northwest. During fall migration, salmonids pass through urban watersheds which are contaminated with stormwater runoff. As the coho salmon pass through these waters, many will show symptoms of lethargy, loss of equilibrium and disorientation, and die within a few hours of showing these symptoms. These symptoms and behaviors are prevalent after rain events. Mortality often occurs before salmon have the opportunity to spawn, which is determined by cutting open female carcasses and observing for unfertilized eggs. Rates of pre-spawn mortality could impact the local salmon populations. Based on model projections, if rates continue, populations of coho salmon could become extinct within the next few decades.

<span class="mw-page-title-main">Kokanee salmon</span> Species of fish

The kokanee salmon, also known as the kokanee trout, little redfish, silver trout, kikanning, Kennerly's salmon, Kennerly's trout, or Walla, is the non-anadromous form of the sockeye salmon. There is some debate as to whether the kokanee and its sea-going relative are separate species; geographic isolation, failure to interbreed, and genetic distinction point toward a recent divergence in the history of the two groups. The divergence most likely occurred around 15,000 years ago when a large ice melt created a series of freshwater lakes and rivers across the northern part of North America. While some members of the salmon and trout family (salmonids) went out to sea (anadromous), others stayed behind in fresh water (non-anadromous). The separation of the sockeye and the kokanee created a unique example of sympatric speciation that is relatively new in evolutionary terms. While they occupy the same areas and habitats during the breeding season, when ocean-going sockeye salmon return to freshwater to spawn, the two populations do not mate with each other in some regions, suggesting speciation.

References

Citations

  1. ↑ Fisheries and Oceans Canada species account Retrieved 2007 October 16
  2. ↑ Fishbase species account Retrieved 2007 October 16
  3. ↑ J.R. Irvine; E. Linn; K. Gillespie; C. McLeod; J.D. Reist (March 2009). Pacific Salmon in Canada's Arctic Draining Rivers, With Emphasis on Those in British Columbia and the Yukon (PDF) (Report). Pacific Fisheries Resource Conservation Council. Archived from the original (PDF) on April 30, 2021. Retrieved December 30, 2017.
  4. ↑ N. B. Scofield (1916). "The humpback and dog salmon taken in San Lorenzo River". California Fish and Game. 2 (1): 41.
  5. ↑ Richard J. Hallock; Donald H. Fry Jr. "Five Species of Salmon, Oncorhynchus, in the Sacramento River, California". California Fish and Game. 53 (1): 5~22. CiteSeerX   10.1.1.475.6744 .
  6. ↑ Tom D. Skiles; Ronald M. Yoshiyama; Peter B. Moyle (2013). "Pink salmon (Oncorhynchus gorbuscha) in the Salinas River, California: new record and historical perspectives". California Fish and Game. 99 (1): 55–59. Retrieved December 30, 2017.
  7. ↑ Tiffany Camhi (December 9, 2017). "Marin's Lagunitas Creek Welcomes Unexpected Guests in this Year's Spawning Season". KQED News California Report. Retrieved December 29, 2017.
  8. ↑ "Pink Salmon (Oncorhynchus gorbuscha) - Species Profile".
  9. ↑ O. gorbuscha (Walbaum, 1792) - горбуша. In Petrosyan, V.G. (ed), Позвоночные животные России (Vertebrates of Russia) information system
  10. ↑ John D. Armstrong; Colin W. Bean; Alan Wells (2018). "The Scottish invasion of pink salmon in 2017" (PDF). Journal of Fish Biology. 93:8–11 (1): 8–11. Bibcode:2018JFBio..93....8A. doi:10.1111/jfb.13680. PMID   29956309. S2CID   49606948.
  11. ↑ Furuly, Jan Gunnar (24 August 2021). "Nå invaderer monsterlaksen Akerselva. Men det er ikke aktuelt å fjerne den med garn eller harpun". Aftenposten .
  12. ↑ "Pink salmon | Washington Department of Fish & Wildlife".
  13. ↑ dfg.webmaster@alaska.gov. "Pink Salmon Species Profile, Alaska Department of Fish and Game". www.adfg.alaska.gov. Retrieved 2021-03-18.
  14. ↑ Fisheries, NOAA (2021-01-27). "Pink Salmon | NOAA Fisheries". NOAA. Retrieved 2021-03-18.
  15. ↑ Dunlop, Kathy; Eloranta, Antti P.; Schoen, Erik; Wipfli, Mark; Jensen, Jenny L. A.; Muladal, Rune; Christensen, Guttorm N. (2021). "Evidence of energy and nutrient transfer from invasive pink salmon (Oncorhynchus gorbuscha) spawners to juvenile Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) in northern Norway". Ecology of Freshwater Fish. 30 (2): 270–283. Bibcode:2021EcoFF..30..270D. doi: 10.1111/eff.12582 . hdl: 11250/2688653 . ISSN   1600-0633.
  16. ↑ Bailey, C. J.; Andersson, L. C.; Arbeider, M.; Bradford, K.; Moore, J. W. (2019-06-01). "Salmon egg subsidies and interference competition among stream fishes". Environmental Biology of Fishes. 102 (6): 915–926. Bibcode:2019EnvBF.102..915B. doi:10.1007/s10641-019-00880-9. ISSN   1573-5133. S2CID   111389451.
  17. ↑ Gende, S.M.; Quinn, T.P.; Willson, M.F. (2001-05-01). "Consumption choice by bears feeding on salmon". Oecologia. 127 (3): 372–382. Bibcode:2001Oecol.127..372G. doi:10.1007/s004420000590. ISSN   1432-1939. PMID   28547108. S2CID   41395058.
  18. ↑ Quinn, Thomas P. QuinnT P.; Carlson, Stephanie M. CarlsonS M.; Gende, Scott M. GendeS M.; Harry B. Rich, Jr H. B. Rich (2009-02-13). "Transportation of Pacific salmon carcasses from streams to riparian forests by bears". Canadian Journal of Zoology. 87 (3): 195–203. doi:10.1139/Z09-004.
  19. ↑ Helfield, James M.; Naiman, Robert J. (2001). "Effects of Salmon-Derived Nitrogen on Riparian Forest Growth and Implications for Stream Productivity". Ecology. 82 (9): 2403–2409. doi:10.1890/0012-9658(2001)082[2403:EOSDNO]2.0.CO;2. ISSN   1939-9170.
  20. ↑ Chaloner, Dominic T.; Wipfli, Mark S.; Caouette, John P. (2002). "Mass loss and macroinvertebrate colonisation of Pacific salmon carcasses in south-eastern Alaskan streams". Freshwater Biology. 47 (2): 263–273. Bibcode:2002FrBio..47..263C. doi:10.1046/j.1365-2427.2002.00804.x. ISSN   1365-2427.
  21. ↑ Wipfli, Mark S.; Hudson, John P.; Caouette, John P.; Chaloner, Dominic T. (2003-03-01). "Marine Subsidies in Freshwater Ecosystems: Salmon Carcasses Increase the Growth Rates of Stream-Resident Salmonids". Transactions of the American Fisheries Society. 132 (2): 371–381. Bibcode:2003TrAFS.132..371W. doi: 10.1577/1548-8659(2003)132<0371:MSIFES>2.0.CO;2 . ISSN   0002-8487.
  22. ↑ "Comprehensive Report Species - Oncorhynchus gorbuscha". www.natureserve.org. Retrieved 11 April 2018.
  23. ↑ "Fisheries and Aquaculture - Global Production". Food and Agriculture Organization of the United Nations (FAO). Retrieved 2024-05-06.
  24. ↑ Annual Statistics 2010: Commercial salmon catch by species and country North Pacific Anadromous Fish Commission Statistical Yearbook. Retrieved 2015 March 16
  25. ↑ Fisheries Improvement: Western Pacific Salmon: Overview Dec 2013 Sustainable Fisheries Partnership www.sustainablefish.org (retrieved March 2015)
  26. ↑ Sakhalin Island Regional Salmon FIP salmonfippartnership.org (March 2015)
  27. ↑ Salmon Enhancement and Hatcheries Retrieved 2007 October 16
  28. ↑ Weiss, Miranda (June 3, 2022). "There are too many pink salmon in the Pacific". Popular Science . Retrieved June 11, 2022.
  29. ↑ Batten, Sonia; Ruggerone, Gregory; Ortiz, Ivonne (June 8, 2018). "Pink Salmon induce a trophic cascade in plankton populations in the southern Bering Sea and around the Aleutian Islands". Fisheries Oceanography. 27 (6): 548–559. Bibcode:2018FisOc..27..548B. doi: 10.1111/fog.12276 . S2CID   90709968.

Sources

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