AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Oncorhynchus kisutch [WoRMS] | |
Authority | (Walbaum, 1792) | |
Family | Salmonidae | |
Order | Salmoniformes | |
Class | Actinopterygii | |
Phylum | Chordata | |
Synonym (?) | ||
Sub-species level (?) | Not entered |
Native origin (?) | Not entered Comments: N Pacific |
Life form / Life stage (?) |
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Sociability / Life stage (?) |
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Reproductive frequency (?) | Semelparous References (not structured): Sandercock, F. K. 1991. Life history of coho salmon (Oncorhynchus kisutch). Pacific salmon life histories, pp. 395-445. Comments: After spawning, the adults die. |
Reproductive type (?) | Sexual References: Sandercock, F. K. 1991. Life history of coho salmon (Oncorhynchus kisutch). Pacific salmon life histories, pp. 395-445. Comments: Adult migrate from the sea into streams to deposit their eggs in gravel. Each female produces several thousand eggs, which are reduced in number by a high mortality. After fertilization has occurred, the eggs are buried by other female coho that are digging their nests. Following reproduction, males and females die, giving the waters more nutrients. Larvae hatch 6-8 weeks after fertilization. The larvae remain in the gravel for 2-3 weeks. Coho live in streams or rivers for about a year until they move to the ocean. |
Developmental trait (?) | Spawning References: Sandercock, F. K. 1991. Life history of coho salmon (Oncorhynchus kisutch). Pacific salmon life histories, pp. 395-445. Comments: When the fish reach the spawning grounds the female selects a nest site. Once the nest site has been selected, she will defend it against other females. |
Characteristic feeding method / Life stage (?) |
References (not structured): Gonzales, E. J. 2006. Diet and prey consumption of juvenile Coho salmon (Oncorhynchus kisutch) in three northern California streams (Doctoral dissertation, Humboldt State University). Comments: Young coho salmon which inhabit lakes and rivers eat mainly insects. When migrating to the sea, the young salmon dine on plankton and small crustaceans. As they grow and move further out to sea, they begin to eat larger forage such as anchovies, sand lance, herring and squid. |
Mobility / Life stage (?) |
References (not structured): Sandercock, F. K. 1991. Life history of coho salmon (Oncorhynchus kisutch). Pacific salmon life histories, pp. 395-445. Comments: The female quickly moves to the upstream edge of the nest and starts digging a new pitt, covering the eggs. The whole process is repeated for several days until the female deposits all her eggs. Larvae hatch 6-8 weeks after fertilization. The larvae remain in the gravel for 2-3 weeks. |
Salinity tolerance range (?) | Exact range: 0 - 15 References: Coche, A. G. 1967. Osmotic regulation in juvenile oncorhynchus kisutch (Walbaum)-I: The salinity tolerance of 50-day old fry. Hydrobiologia, 29, pp. 426-440. Comments: For somewhat smaller fish, mortality started at a salinity higher than 15 ppt. It reached 100% from 26 ppt to about 28 ppt, depending on the age of the fish. |
Habitat modifying ability potential (?) | Allogenic ecosystem engineers References: Berejikian, B. A., Tezak, E. P., Schroder, S. L., Knudsen, C. M., Hard, J. J. 1997. Reproductive behavioral interactions between wild and captively reared coho salmon (Oncorhynchus kisutch). ICES Journal of Marine Science, 54(6), pp. 1040-1050. Comments: Female breeding behaviors recorded were nest digs, cover digs, and probes. Nest digs were performed during nest construction by multiple caudal fin flexures. Cover digs were considered as digs that covered eggs in the nest pocket; these digs began immediately following spawning. Probes were defined as the movement made by females when they lowered their anal fins and mid-body into a developing nest depression. Soon after the anal fin contacted the gravel, the female would lift out of the nest pocket. |
Toxicity / Life stage (?) | Not relevant |
Bioaccumulation association (?) | Anthropogenic chemical compounds References: Fast, A. W., D'Itri, F. M., Barclay, D. K., Katase, S. A., Madenjian, C. 1990. Heavy metal content of Coho oncorhynchus kisutch and Chinook Salmon O. tschawytscha reared in deep upwelled ocean waters in Hawaii 1. Journal of the World Aquaculture Society, 21(4), pp. 271-276. |
Known human health impact? | Known Comments: Harmless. Oncorhynchus kisutch make a good meal. Often, coho are either sold frozen or canned by commercial fisherman. Twice as many coho salmon are harvested commercially in North America than in Asia. During the late 1950's about 10 million coho salmon per year were caught. |
Known economic impact? | Known References: Scarnecchia, D. L., Wagner, H. H. 1980. Contribution of wild and hatchery-reared coho salmon, Oncorhynchus kisutch, to the Oregon ocean sport fishery. Fishery Bulletin, 77(3), pp. 617-623. Comments: Oncorhynchus kisutch, is the most abundant species of salmon contributing to Oregon's commercial troll and ocean recreational fisheries. |
Known measurable environmental impact? | Not known Comments: Not available. |
Included in the Target Species list? | No References: HELCOM, 2009. Alien Species and Ballast Water [PDF]. Available at: (https://archive.iwlearn.net/helcom.fi/stc/files/shipping/Table_2_Alienspecies_%20lists_2009.pdf) |
Association with vessel vectors (?) | Unknown Comments: Not available. |
Last update by | Sandra Gečaitė, 2024-07-19 |