Trout

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:

Salmo: marble trout, S. marmoratus

• Genus Salmo, all extant species except Atlantic salmon
  • Adriatic trout, Salmo obtusirostris
  • Brown trout, Salmo trutta
    • River trout, 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

Oncorhynchus: rainbow trout, O. mykiss

• 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
      • Whitehorse Basin cutthroat trout
    • 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
  • Gila trout, Oncorhynchus gilae
  • Rainbow trout, Oncorhynchus mykiss
    • Kamchatkan rainbow trout, 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
      • Kern River rainbow trout, Oncorhynchus mykiss aguabonita var. gilberti
      • Sacramento golden trout, Oncorhynchus mykiss aguabonita var. stonei
      • Little Kern golden trout, Oncorhynchus mykiss aguabonita var. whitei
    • Kamloops rainbow trout, Oncorhynchus mykiss kamloops
    • Baja California rainbow trout, Nelson's trout, or San Pedro Martir trout, Oncorhynchus mykiss nelsoni
    • Eagle Lake trout, Oncorhynchus mykiss aquilarum
    • McCloud River redband trout, Oncorhynchus mykiss stonei
    • Sheepheaven Creek redband trout
  • Mexican golden trout, Oncorhynchus chrysogaster

Salvelinus: brook trout, S. fontinalis

• 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)
• Hybrids
  • Tiger trout, Salmo trutta X Salvelinus fontinalis (infertile)
  • Speckled Lake (Splake) trout, Salvelinus namaycush X Salvelinus fontinalis (fertile)

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 adipose fin along the back, near the tail. The pelvic fins sit well back on the body, on each side of the anus. The swim bladder is connected to the esophagus, allowing for gulping or rapid expulsion of air, a condition known as physostome. Unlike many other physostome fish, trout do not use their bladder as an auxiliary device for oxygen uptake, relying solely on their gills.

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).

A trout farm in Sochi, Russia

Trout are usually found in cool (50–60 °F or 10–16 °C), clear streams and lakes, although many of the species have anadromous strains as well. Young trout are referred to as troutlet, troutling or fry. They are distributed naturally throughout North America, northern Asia and Europe. Several species of trout were introduced to Australia and New Zealand by amateur fishing enthusiasts in the 19th century, effectively displacing and endangering several upland native fish species. The introduced species included brown trout from England and rainbow trout from California. The rainbow trout were a steelhead strain, generally accepted as coming from Sonoma Creek. The rainbow trout of New Zealand still show the steelhead tendency to run up rivers in winter to spawn.[2]

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.

Golden trout, Oncorhynchus aguabonita

Trout generally feed on other fish, and soft bodied aquatic invertebrates, such as flies, mayflies, caddisflies, stoneflies, mollusks and dragonflies. In lakes, various species of zooplankton often form a large part of the diet. In general, trout longer than about 300 millimetres (12 in) prey almost exclusively on fish, where they are available. Adult trout will devour smaller fish up to 1/3 their length. Trout may feed on shrimp, mealworms, bloodworms, insects, small animal parts, and eel.

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]

Baked trout

As a group, trout are somewhat bony, but the flesh is generally considered to be tasty. The flavor of the flesh is heavily influenced by the diet of the fish. For example, trout that have been feeding on crustaceans tend to be more flavorful than those feeding primarily on insect life. Additionally, they provide a good fight when caught with a hook and line, and are sought after recreationally. Because of their popularity, trout are often raised on fish farms and planted into heavily fished waters, in an effort to mask the effects of overfishing. Farmed trout and char are also sold commercially as food fish. Trout is sometimes prepared by smoking.[5]

One fillet of trout (79 g) contains:[6]

• Energy : 490 kJ (117 kcal)
• Fat (g): 5.22
• Carbohydrates (g): 0
• Fibers (g): 0
• Protein (g): 16.41
• Cholesterol (mg): 46

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 "cut-bow" trout, which is a contamination of both lineages’ genes. One solution to this issue is implemented by New Mexico 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.

Climate change is also dwindling native salmonid populations. Climate change continually affects various cold-water fish, including trout. With an increase of temperature along with changes in spawning river flow, an abundance of trout species are effected negatively. In the past, a mere 8 °F increase was predicted to eliminate half of the native brook trout in the Southern Appalachian Mountains.[13] Trout prefer cold water (50-60 °F) streams to spawn and live, but warming water temperatures are altering this ecosystem and further deteriorate native populations.

• List of smoked foods
• Trout tickling

• 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.

Wikimedia Commons has media related to Trout.

Wikibooks Cookbook has a recipe/module on

• Trout

• 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.