Rainbow trout! jimmy

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Rainbow trout! jimmy

  1. 1. Rainbow trout! Kingdom: Animalia Phylum: Chordata Subphylum: Vertebrata Class: Actinopterygii Order: Salmoniformes Family: Salmonidae Genus: Oncorhynchus Species: Oncorhynchus mykiss
  2. 2. Geographic Range. <ul><li>They are only native to the Pacific Coast of North America, extending from Alaska down to the border between California and Mexico. However, they have been introduced throughout the United States. and in every continent except for Antarctica for game fishing purposes. </li></ul><ul><li>There are two forms: freshwater resident and anadromous. The resident form is commonly called rainbow trout while the anadromous form is called steelhead. </li></ul>
  3. 3. Places they live <ul><li>The dark blue is where the rainbow trout are most seen. </li></ul><ul><li>The light blue is where they are seen a lot but not native </li></ul><ul><li>The aqua blue is where they are not seen as much and not native. </li></ul>
  4. 4. Habitat <ul><li>Freshwater, brackish, or marine waters of temperate zones. The anadromous form, called steelhead, spawn and complete their early development in freshwater mountain streams, then migrate to spend their adult life in the ocean. In freshwater, they prefer cool water but have been known to tolerate water temperatures up to 24°C native climates have water temperatures around 12°C in the summer. Productive streams have a good mixture of riffles and pools and overhanging vegetation for shade. Most importantly, they require gravel beds to lay their eggs, and therefore, are sensitive to sedimentation and channel scouring. Juvenile trout prefer protective cover and low velocity water and have been known to be swept away and killed in water that is too fast. </li></ul>
  5. 5. Physical Description <ul><li>Physical description changes with sex, age, and habitat. In general, they are streamlined, with 8 to 12 spines in the anal fin and lack teeth at the base of the tongue unlike their close relatives, Oncorhynchus clarkii. The undersides tend to be silvery with a pinkish red stripe along the upper-middle part of the body, though this stripe can vary from dark to light. Resident rainbows and spawning steelhead tend to be lighter with more pronounced pink stripes, while ocean-going steelhead are darker and silvery to blend into their ocean environment. </li></ul>
  6. 6. Physical description
  7. 7. Reproduction <ul><li>Female fish find suitable nest sites while their male mate guards the site from other interested males and predators. The female digs the nest (called a redd) with her anal fin and then descends upon it to position her vent and anal fin into the deepest part of the red. The male joins her in a parallel position so that their vents are opposite each other. The male and female open their mouths, arch their backs, and deposit the eggs and milt (fish sperm) at the same time. The eggs are enveloped in a cloud of milt and are fertilized. Only a few seconds elapse from the time the female drops into the redd and fertilization occurs. The female then covers the nest with gravel and repeats the process again a few times until she has deposited all of her eggs. </li></ul>
  8. 8. Predators <ul><li>kingfishers ( Ceryle ) </li></ul><ul><li>grizzly bears ( Ursus arctos ) </li></ul><ul><li>American black bears ( Ursus americanus ) </li></ul><ul><li>river otters ( Lontra canadensis ) </li></ul><ul><li>mink ( Neovison vison and Mustela lutreola ) </li></ul><ul><li>raccoons ( Procyon lotor ) </li></ul><ul><li>sea lampreys ( Petromyzon marinus ) </li></ul><ul><li>mergansers ( Mergus merganser ) </li></ul><ul><li>great blue herons ( Ardea herodias ) </li></ul><ul><li>other trout species ( Salmonidae ) </li></ul><ul><li>humans ( Homo sapien ) </li></ul>
  9. 9. Food habits <ul><li>Rainbow trout and steelhead are insectivorous and piscivorous. Resident rainbow trout tend to eat more fish than steelhead. Both species primarily feed on invertebrate larvae drifting in mid-water to conserve energy that would be expended if they were foraging for food in the substrate. Young rainbow trout and steelhead eat insect larvae, crustaceans, other aquatic invertebrates, and algae. </li></ul>
  10. 10. In the news <ul><li>Jumbo rainbow trout are being planted in lakes in Jefferson, Mason and Kitsap counties to boost fishing opportunities this fall and winter. </li></ul><ul><li>Crews from the state Department of Fish and Wildlife and Trout Lodge are planting 25,400 rainbow trout – each weighing nearly one pound – into Gibbs, Leland, and Teal lakes in Jefferson County; Island, Kokanee, Lost, Nahwatzel, Spencer and Trails End lakes in Mason County; and Island and Kitsap lakes in Kitsap County. </li></ul><ul><li>Crews were expected to finish stocking the lakes last week, said Mark Downen, district fish biologist. The trout were raised at the department’s Eells Springs Hatchery near Shelton, Satsop Springs Hatchery near Elma and Trout Lodge hatcheries near Tumwater. </li></ul><ul><li>Read more: http://www.thenewstribune.com/2011/10/23/1876328/jumbo-rainbow-trout-planted-in.html#ixzz1bjWnQmiw </li></ul>
  11. 11. Fun facts <ul><li>Rainbow trout individuals live for 6 to 8 years in the wild, possibly up to 11 years. </li></ul>
  12. 12. Works consulted <ul><li>http://www.laketrout.org/rainbowtrout/1wr.jpg </li></ul><ul><li>http://bss.sfsu.edu/holzman/courses/fall01%20projects/rainbow%20trout.htm </li></ul><ul><li>http://animaldiversity.ummz.umich.edu/site/accounts/information/Oncorhynchus_mykiss.html </li></ul><ul><li>http://www.thenewstribune.com/2011/10/23/1876328/jumbo-rainbow-trout-planted-in.html </li></ul>

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