Trout
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Trout (pl.: trout) is a
Trout are closely related to
Trout are classified as
.Species
The name "trout" is commonly used for many (if not most) species in three of the seven genera in the subfamily Salmoninae: Salmo (Atlantic), Oncorhynchus (Pacific) and Salvelinus (circum-arctic). Fish species referred to as trout include:
- Genus Salmo, all extant species except Atlantic salmon
- Adriatic trout, Salmo obtusirostris
- Brown trout, Salmo trutta
- S. t. morpha fario
- Lake trout/Lacustrine trout, S. t. morpha lacustris
- Sea trout, S. t. morpha trutta
- Flathead trout, Salmo platycephalus
- Marble trout, Soca River trout or Soča trout – Salmo marmoratus
- Ohrid trout, Salmo letnica, S. balcanicus (extinct), S. lumi, and S. aphelios
- Sevan trout, Salmo ischchan
- Genus Oncorhynchus, six of the 12 extant species
- Apache trout, Oncorhynchus apache
- Biwa trout, Oncorhynchus masou rhodurus
- Cutthroat trout, Oncorhynchus clarki
- Coastal cutthroat trout, O. c. clarki
- Crescenti trout, O. c. c. f. crescenti
- Alvord cutthroat trout, O. c. alvordensis (extinct)
- Bonneville cutthroat trout, O. c. utah
- Humboldt cutthroat trout, O. c. humboldtensis
- Lahontan cutthroat trout, O. c. henshawi
- Paiute cutthroat trout, O. c. seleniris
- Snake River fine-spotted cutthroat trout, O. c. behnkei
- Westslope cutthroat trout, O. c. lewisi
- Yellowfin cutthroat trout, O. c. macdonaldi (extinct)
- Yellowstone cutthroat trout, O. c. bouvieri
- Colorado River cutthroat trout, O. c. pleuriticus
- Greenback cutthroat trout, O. c. stomias
- Rio Grande cutthroat trout, O. c. virginalis
- Coastal cutthroat trout, O. c. clarki
- Gila trout, Oncorhynchus gilae
- Rainbow trout, Oncorhynchus mykiss
- Oncorhynchus mykiss mykiss
- Columbia River redband trout, Oncorhynchus mykiss gairdneri
- Coastal rainbow trout (steelhead), Oncorhynchus mykiss irideus
- Beardslee trout, Oncorhynchus mykiss irideus var. beardsleei
- Great Basin redband trout, Oncorhynchus mykiss newberrii
- Golden trout, Oncorhynchus mykiss aguabonita
- Oncorhynchus mykiss aguabonitavar. gilberti
- Oncorhynchus mykiss aguabonitavar. stonei
- Oncorhynchus mykiss aguabonitavar. whitei
- Oncorhynchus mykiss kamloops
- Oncorhynchus mykiss nelsoni
- Oncorhynchus mykiss aquilarum
- Oncorhynchus mykiss stonei
- Sheepheaven Creek redband trout
- Mexican golden trout, Oncorhynchus chrysogaster
- Genus Salvelinus, five of the 52 extant species
- Brook trout, Salvelinus fontinalis
- Aurora trout, S. f. timagamiensis
- Bull trout, Salvelinus confluentus
- Dolly Varden trout, Salvelinus malma
- Lake trout, Salvelinus namaycush
- Silver trout, † Salvelinus agassizi (extinct)
- Brook trout, Salvelinus fontinalis
- Hybrids
- Tiger trout, Salmo trutta X Salvelinus fontinalis (infertile)
- Speckled Lake (Splake) trout, Salvelinus namaycush X Salvelinus fontinalis (fertile)
Fish from other families
- Pseudaphritidae
- Genus Pseudaphritis
- Sand trout, Pseudaphritis urvillii
- Genus Pseudaphritis
- Sciaenidae
- Genus Cynoscion
- Spotted sea-trout, Cynoscion nebulosus
- Genus Cynoscion
Anatomy
Trout that live in different environments can have dramatically different colorations and patterns. Mostly, these colors and patterns form as camouflage, based on the surroundings, and will change as the fish moves to different habitats. Trout in, or newly returned from the sea, can look very silvery, while the same fish living in a small stream or in an alpine lake could have pronounced markings and more vivid coloration; it is also possible that in some species, this signifies that they are ready to mate. In general, trout that are about to breed have extremely intense coloration and can look like an entirely different fish outside of spawning season. It is virtually impossible to define a particular color pattern as belonging to a specific breed; however, in general, wild fish are claimed to have more vivid colors and patterns.
Trout have fins entirely without spines, and all of them have a small
There are many species, and even more populations, that are isolated from each other and morphologically different. However, since many of these distinct populations show no significant genetic differences, what may appear to be a large number of species is considered a much smaller number of distinct species by most ichthyologists. The trout found in the eastern United States are a good example of this. The brook trout, the aurora trout, and the (extinct) silver trout all have physical characteristics and colorations that distinguish them, yet genetic analysis shows that they are one species, Salvelinus fontinalis.
Lake trout (Salvelinus namaycush), like brook trout, belong to the char genus. Lake trout inhabit many of the larger lakes in North America, and live much longer than rainbow trout, which have an average maximum lifespan of seven years. Lake trout can live many decades, and can grow to more than 30 kilograms (66 lb).
Habitat
Trout are usually found in cool (50–60 °F or 10–16 °C), clear streams and lakes, although many of the species have
In Australia the rainbow trout was introduced in 1894 from New Zealand and is an extremely popular gamefish in recreational angling.[3] Despite severely impacting the distribution and abundance of native Australian fish, such as the climbing galaxias, millions of rainbow and other trout species are released annually from government and private hatcheries.[3]
The closest resemblance of seema trout and other trout family can be found in the Himalayan Region of India, Nepal, Bhutan, Pakistan and in Tian Shan mountains of Kyrgyzstan.[clarification needed]
Diet
Trout generally feed on other fish, and soft bodied aquatic
Trout who swim the streams love to feed on land animals, aquatic life, and flies.[4] Most of their diet comes from macroinvertebrates, or animals that do not have a backbone like snails, worms, or insects. They also eat flies, and most people who try to use lures to fish trout mimic flies because they are one of trout's most fed on meals.[4] Trout enjoy certain land animals, including insects like grasshoppers. They also eat small animals like mice when they fall in. (Although only large trout have mouths capable of eating mice.) They consume a diet of aquatic life like minnows or crawfish as well. Trout have a diverse diet they follow; they have plenty of different oppositions.[4]
Trout as food
Compared to other salmonids, trout are somewhat more
In
Nutritional value
One fillet of trout (about 79 g or 2.8 oz) contains:[7]
- Energy: 490 kJ (117 kcal)
- Fat (g): 5.22
- Carbohydrates (g): 0
- Fibers (g): 0
- Protein (g): 16.41
- Cholesterol (mg): 46
Trout fishing
Trout are very popular freshwater
Many species of trout, most noticeably
River fishing
While trout can be caught with a normal
Understanding how moving water shapes the stream channel makes it easier to find trout. In most streams, the current creates a riffle-run-pool pattern that repeats itself over and over. A deep pool may hold a big brown trout, but rainbow trout and smaller brown trout are likely found in runs. Riffles are where fishers will find small trout, called troutlet, during the day and larger trout crowding in during morning and evening feeding periods.[8]
- Riffles have a fast current and shallow water. This gives way to a bottom of gravel, rubble or boulder. Riffles are morning and evening feeding areas. Trout usually spawn just above or below riffles, but may spawn right in them.
- Runs are deeper than riffles with a moderate current and are found between riffles and pools. The bottom is made up of small gravel or rubble. These hot spots hold trout almost anytime, if there is sufficient cover.
- Pools are smoother and look darker than the other areas of the stream. The deep, slow-moving water generally has a bottom of silt, sand, or small gravel. Pools make good midday resting spots for medium to large trout.
- It is recommended that when fishing for trout, that the fisher(s) should use line in the 4–8 lb test for streamfish, and stronger line with the same diameter for trout from the sea or from a large lake, such as Lake Michigan. It is also recommended to use a hook size 8-5 for trout of all kind. Trout, especially farm-raised ones, tend to like .
Ice fishing
Fishing for trout under the ice generally occurs in depths of 4 to 8 feet (1.2 to 2.4 m). Because trout are cold water fish, during the winter they move from up-deep to the shallows, replacing the small fish that inhabit the area during the summer. Trout in winter constantly cruise in shallow depths looking for food, usually traveling in groups, although bigger fish may travel alone and in water that's somewhat deeper, around 12 feet (3.7 m). Rainbow, Brown, and Brook trout are the most common trout species caught through the ice.[9]
Trout fishing records
By information from International Game Fish Association (IGFA), the most outstanding records are:[10]
- Brook trout caught by Dr. W. Cook in the Nipigon River, Canada, on July 1, 1916, that weighed 6.57 kg (14 lb 8 oz)
- Cutthroat trout caught by John Skimmerhorn in Pyramid Lake located in Nevada, US, on December 1, 1925, that weighed 18.59 kg (41 lb 0 oz)
- Bull trout caught by N. Higgins in Lake Pend Oreille located in Idaho, US, on October 27, 1949, that weighed 14.51 kg (32 lb 0 oz)
- Golden trout caught by Chas Reed in Cooks Lake located in Wyoming, US, on August 5, 1948, that weighed 4.98 kg (11 lb 0 oz)
- Rainbow trout caught by Sean Konrad in Lake Diefenbaker, Canada, on September 5, 2009, that weighed 21.77 kg (48 lb 0 oz)
- Lake trout caught by Lloyd Bull in Great Bear Lake, Canada, on August 19, 1995, that weighed 32.65 kg (72 lb 0 oz)
Baits
-
Corn worms are also excellent live-bait when trout fishing.
-
stonefly are used as live-baitfor trout fishing.
-
Salmon roe (red caviar)
-
Worms are cheap and effective bait to use for trout and most types of fish.
-
Asoft plastic lureor "trout worm"
-
Wooly buggers can be tied in every color imaginable.
-
Egg patterns are effective for steelhead and trout in rivers.
-
Muddler minnow
Declines in native trout populations
Salmonid populations in general have been declining due to numerous factors, including invasive species, hybridization, wildfires, and climate change. Native salmonid fish in the western and southwestern United States are threatened by non-native species that were introduced decades ago. Non-native salmonids were introduced to enrich recreational fishing;[11] however, they quickly started outcompeting and displacing native salmonids upon their arrival. Non-native, invasive species are quick to adapt to their new environment and learn to outcompete any native species, making them a force the native salmon and trout have to reckon with. Not only do the non-native fish drive the native fish to occupy new niches, but they also try to hybridize with them, contaminating the native gene construction. As more hybrids between native and non-native fish are formed, the lineage of the pure fish is continuously being contaminated by other species and soon may no longer represent the sole native species. The Rio Grande cutthroat trout (Oncorhynchus clarki virginalis) are susceptible to hybridization with other salmonids such as rainbow trout (Oncorhynchus mykiss) and yield a new "cutbow" trout, which is a contamination of both lineages’ genes. One solution to this issue is implemented by New Mexico Department of Game and Fish hatcheries: stock only sterile fish in river streams. Hatcheries serve as a reservoir of fish for recreational activities but growing and stocking non-sterile fish would worsen the hybridization issue on a quicker, more magnified time scale. By stocking sterile fish, the native salmonids can't share genes with the non-native hatchery fish, thus, preventing further gene contamination of the native trout in New Mexico. Fire is also a factor in deteriorating Gila trout (Oncorhynchus gilae) populations because of the ash and soot that can enter streams following fires.[12] The ash lowers water quality, making it more difficult for the Gila trout to survive. In some New Mexico streams, the native Gila trout will be evacuated from streams that are threatened by nearby fires and be reintroduced after the threat is resolved.
See also
References
- ^ "What are oily fish?". Food Standards Agency. June 23, 2004. Archived from the original on December 4, 2013. Retrieved February 17, 2013.
- .
- ^ a b Gomon, Martin; Bray, Dianne. "Rainbow Trout, Oncorhynchus mykiss". Fishes of Australia. Archived from the original on September 4, 2014. Retrieved August 30, 2014.
- ^ a b c "Trout Food | Stream Explorers". www.streamexplorers.org. Retrieved April 9, 2020.
- ISBN 978-1-57223-276-1.
- ^ Zheng, Sarah (August 15, 2018). "Is rainbow trout the same as salmon? China says yes despite food safety fears". South China Morning Post. Retrieved May 8, 2023.
- ^ "Search the USDA National Nutrient Database for Standard Reference". Nal.usda.gov. Archived from the original on March 3, 2015. Retrieved December 26, 2011.
- ^ "Cotrout - The Outdoor Resources". Cotrout. Retrieved June 3, 2019.
- ^ Straw, Matt (December 5, 2012). "Ice Fishing Trout". In-Fisherman. Retrieved February 7, 2023.
- ^ "IGFA World Records". International Game Fish Association. Retrieved November 1, 2015.
- .
- ^ "Gila Trout Recovery and Angling". New Mexico Department of Game and Fish. Retrieved December 2, 2019.
- ^ Climate Change and Cold Water Fish. United States Environmental Protection Agency. 1999.
Further reading
- Robert J. Behnke, Trout and Salmon of North America. Illustrated by Joseph R. Tomelleri. New York: The Free Press, 2002.
- Jen Corrinne Brown, Trout Culture: How Fly Fishing Forever Changed the Rocky Mountain West. Seattle, WA: University of Washington Press, 2015.
External links
- Trout at Curlie
- Trout.co.uk – Website focused purely on fishing for trout
- Trout Unlimited – Conserving, protecting and restoring North America's coldwater fisheries and their watersheds
- "Trout Science," www.troutlet.com, 2000.