File:Atlantic salmon parr.jpg
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DescriptionAtlantic salmon parr.jpg |
العربية: سمكة سلمون أطلسي يافعة في فقَّاسةٍ مائيَّة. مسقط رأسها نهر ماكياس في ولاية مين
English: Atlantic Salmon parr of Maine's Machias River in a hatchery |
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Author | Peter Steenstra at the Green Lake National Fish Hatchery | ||||
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current | 14:17, 8 June 2010 | 957 × 644 (306 KB) | Innotata (talk | contribs) | {{Information |Description={{en|1=Atlantic Salmon parr of Maine's Machias River in a hatchery}} |Source=[http://www.fws.gov/digitalmedia/index.php United States Fish and Wildlife Service National Digital Library] |Author=Peter Steenstra at the Green Lake |
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Image title | Atlantic salmon spend the first two years of life in the fresh water habitats of their native stream (occasionally three, depending upon food availability). At two years of age, the fish undergo the process of smoltification, resulting in changes in certain cells of the gills and kidneys (allowing survival in either fresh or salt water), and brings about a silvery body color (better camouflage in the open ocean). Also during smoltification, salmon imprint upon the chemical "fingerprint" of their home river which allows them to recognize it upon their return from the sea. Once smoltification is complete, and water temperature increases to over 50o F, salmon smolts instinctively migrate downstream to the North Atlantic Ocean, and eventually to the cold waters off Greenland. Here they find food in the form of shrimp, herring and capelin, and two years later, at four, the survivors return to their home river to spawn. Unlike Pacific salmon, Atlantic salmon may repeat the spawning cycle several times. Green Lake National Fish Hatchery, Maine |
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Author | Steenstra, Peter |
Orientation | Normal |
Horizontal resolution | 200 dpi |
Vertical resolution | 200 dpi |
Software used | Adobe Photoshop CS Windows |
File change date and time | 13:52, 19 May 2006 |
Color space | Uncalibrated |