Description
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Firstly, Salmon /ˈsæmən/ is the common name for several species of ray-finned fish in the family Salmonidae. Other fish in the same family include trout, char, grayling, and whitefish. Salmon are native to tributaries of the North Atlantic (genus Salmo) and Pacific Ocean (genus Oncorhynchus).
Many species of salmon have been introduced into non-native environments such as the Great Lakes of North America and Patagonia in South America. Salmon are intensively farmed in many parts of the world.
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Typically, salmon are anadromous: they hatch in fresh water, migrate to the ocean, then return to fresh water to reproduce. However, populations of several species are restricted to fresh water throughout their lives. Folklore has it that the fish return to the exact spot where they hatched to spawn.
Tracking studies have shown this to be mostly true. A portion of a returning salmon run may stray and spawn in different freshwater systems; the percent of straying depends on the species of salmon.Homing behavior has been shown to depend on olfactory memory.
Species :
The term “salmon” comes from the Latin salmo, which in turn might have originated from salire, meaning “to leap”.The nine commercially important species of salmon occur in two genera. The genus Salmo contains the Atlantic salmon, found in the North Atlantic, as well as many species commonly named trout.
The genus Oncorhynchus contains eight species which occur naturally only in the North Pacific. As a group, these are known as Pacific salmon.
Chinook salmon have been introduced in New Zealand and Patagonia. Coho, freshwater sockeye, and Atlantic salmon have been established in Patagonia, as well.
Also, there are several other species which are not true salmon, as in the above list but have common names which refer to them as being salmon.
Of those listed below, the Danube salmon or huchen is a large freshwater salmonid related to the salmon above, but others are marine fishes of the unrelated Perciformes order:
Some other fishes called salmon | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Common name | Scientific name | Maximum length |
Common length |
Maximum weight |
Maximum age |
Trophic level |
Fish Base |
FAO | ITIS | |
Australian salmon | Arripis trutta (Forster, 1801) | 89 cm (2 ft 11 in) | 47 cm (1 ft 7 in) | 9.4 kilograms (21 lb) | 26 years | 4.1 | [29] | [30] | ||
Danube salmon | Hucho hucho (Linnaeus, 1758) | 150 cm (4 ft 11 in) | 70 cm (2 ft 4 in) | 52 kilograms (115 lb) | 15 years | 4.2 | [31] | [32] | ||
Hawaiian salmon | Elagatis bipinnulata (Quoy & Gaimard, 1825) | 180 cm (5 ft 11 in) | 90 cm (2 ft 11 in) | 46.2 kilograms (102 lb) | 6 years | 3.6 | [34] | [35] | [36] | |
Indian salmon | Eleutheronema tetradactylum (Shaw, 1804) | 200 cm (6 ft 7 in) | 50 cm (1 ft 8 in) | 145 kilograms (320 lb) | years | 4.4 | [37] | [38] |
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Salmon eggs are laid in freshwater streams typically at high latitudes. The eggs hatch into alevin or sac fry. The fry quickly develop into parr with camouflaging vertical stripes.
The parr stay for six months to three years in their natal stream before becoming smolts, which are distinguished by their bright, silvery colour with scales that are easily rubbed off. Only 10% of all salmon eggs are estimated to survive to this stage.
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Firstly, The smolt body chemistry changes, allowing them to live in salt water. While a few species of salmon remain in fresh water throughout their life cycle, the majority are anadromous and migrate to the ocean for maturation: in these species, smolts spend a portion of their out-migration time in brackish water, where their body chemistry becomes accustomed to osmoregulation in the ocean.
This body chemistry change is hormone-driven, causing physiological adjustments in the function of osmoregulatory organs such as the gills, which leads to large increases in their ability to secrete salt.
Hormones involved in increasing salinity tolerance include insulin-like growth factor I, cortisol, and thyroid hormones,which permits the fish to endure the transition from a freshwater environment to the ocean.
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The salmon spend about one to five years (depending on the species) in the open ocean, where they gradually become sexually mature. The adult salmon then return primarily to their natal streams to spawn. Atlantic salmon spend between one and four years at sea.
When a fish returns after just one year’s sea feeding, it is called a grilse in Canada, Britain, and Ireland. Grilse may be present at spawning, and go unnoticed by large males, releasing their own sperm on the eggs.
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In addition, Prior to spawning, depending on the species, salmon undergo changes. They may grow a hump, develop canine-like teeth, or develop a kype (a pronounced curvature of the jaws in male salmon). All change from the silvery blue of a fresh-run fish from the sea to a darker colour.
Salmon can make amazing journeys, sometimes moving hundreds of miles upstream against strong currents and rapids to reproduce. Chinook and sockeye salmon from central Idaho, for example, travel over 1,400 km (900 mi) and climb nearly 2,100 m (7,000 ft) from the Pacific Ocean as they return to spawn.
Condition tends to deteriorate the longer the fish remain in fresh water, and they then deteriorate further after they spawn, when they are known as kelts. In all species of Pacific salmon, the mature individuals die within a few days or weeks of spawning, a trait known as semelparity. Between 2 and 4% of Atlantic salmon kelts survive to spawn again, all females.
However, even in those species of salmon that may survive to spawn more than once (iteroparity), postspawning mortality is quite high (perhaps as high as 40 to 50%).
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However, To lay her roe, the female salmon uses her tail (caudal fin), to create a low-pressure zone, lifting gravel to be swept downstream, excavating a shallow depression, called a redd. The redd may sometimes contain 5,000 eggs covering 2.8 m2 (30 sq ft). The eggs usually range from orange to red.
One or more males approach the female in her redd, depositing sperm, or milt, over the roe.The female then covers the eggs by disturbing the gravel at the upstream edge of the depression before moving on to make another redd. The female may make as many as seven redds before her supply of eggs is exhausted.
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Furthermore, Each year, the fish experiences a period of rapid growth, often in summer, and one of slower growth, normally in winter. This results in ring formation around an earbone called the otolith (annuli), analogous to the growth rings visible in a tree trunk.
Also, Freshwater growth shows as densely crowded rings, sea growth as widely spaced rings; spawning is marked by significant erosion as body mass is converted into eggs and milt.
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More to that, Freshwater streams and estuaries provide important habitat for many salmon species. They feed on terrestrial and aquatic insects, amphipods, and other crustaceans while young, and primarily on other fish when older.
More to that, Eggs are laid in deeper water with larger gravel, and need cool water and good water flow (to supply oxygen) to the developing embryos.
Mortality of salmon in the early life stages is usually high due to natural predation and human-induced changes in habitat, such as siltation, high water temperatures, low oxygen concentration, loss of stream cover, and reductions in river flow.
Furthermore Estuaries and their associated wetlands provide vital nursery areas for the salmon prior to their departure to the open ocean. Wetlands not only help buffer the estuary from silt and pollutants, but also provide important feeding and hiding areas.
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In a nutshell, Salmon not killed by other means show greatly accelerated deterioration (phenoptosis, or “programmed aging”) at the end of their lives. Their bodies rapidly deteriorate right after they spawn as a result of the release of massive amounts of corticosteroids.
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