Brook trout

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Brook trout
Brook trout in water.jpg
Status TNC G5.svg
Secure  (NatureServe) [1]
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Salmoniformes
Family: Salmonidae
Genus: Salvelinus
Subgenus: Baione
Species:
S. fontinalis
Binomial name
Salvelinus fontinalis
(Mitchill, 1814) 
Subspecies

S. f. agassizii(Garman, 1885)
S. f. timagamiensisHenn & Rinckenbach, 1925

Contents

Synonyms
previous scientific names
  • Salmo fontinalisMitchill, 1814Baione fontinaliSalmo canadensisGriffith & Smith, 1834Salmo hudsonicusSuckley, 1861Salvelinus timagamiensisHenn & Rinckenbach, 1925

The brook trout (Salvelinus fontinalis) is a species of freshwater fish in the char genus Salvelinus of the salmon family Salmonidae. It is native to Eastern North America in the United States and Canada, but has been introduced elsewhere in North America, as well as to Iceland, Europe, and Asia. In parts of its range, it is also known as the eastern brook trout, speckled trout, brook charr, squaretail, or mud trout, among others. [2] A potamodromous population in Lake Superior, as well as an anadromous population in Maine, is known as coaster trout or, simply, as coasters. The brook trout is the state fish of nine U.S. states: Michigan, New Hampshire, New Jersey, New York, North Carolina, Pennsylvania, Vermont, Virginia, and West Virginia, and the Provincial Fish of Nova Scotia in Canada.

Systematics and taxonomy

The brook trout was first scientifically described as Salmo fontinalis by the naturalist Samuel Latham Mitchill in 1814. The specific epithet "fontinalis" comes from the Latin for "of a spring or fountain", in reference to the clear, cold streams and ponds in its native habitat. The species was later moved to the char genus Salvelinus . Though commonly called a trout, the brook trout is thus actually one of the chars, which in North America also include the lake trout, bull trout, Dolly Varden, and the Arctic char.

There is little recognized systematic substructure in the brook trout, but two subspecies have been proposed. On the other hand, three ecological forms are distinguished.

Subspecies

The aurora trout, S. f. timagamiensis, is a subspecies native to two lakes in the Temagami District of Ontario, Canada. [3] The silver trout, (Salvelinus agassizii or S. f. agassizii), is an extinct trout species or subspecies last seen in Dublin Pond, New Hampshire, in 1930. [4] It is considered by fisheries biologist Robert J. Behnke as a highly specialized form of brook trout. [5]

Ecological forms

Robert J. Behnke describes three ecological forms of the brook trout. [6] A large lake form evolved in the larger lakes in the northern reaches of its range and are generally piscivorous as adults. A sea-run form that migrates into saltwater for short periods of time to feed evolved along the Atlantic coastline. Finally, a smaller generalist form that evolved in the small lakes, ponds, rivers, and streams throughout most of the original native range. This generalist form rarely attains sizes larger than 12 in (30 cm) or lives for more than three years. All three forms have the same general appearance.

Hybrids

Tiger trout (top 3), splake (bottom) TigerTrout2.jpg
Tiger trout (top 3), splake (bottom)

The brook trout produces hybrids both with its congeners Salvelinus namaycush and Salvelinus alpinus , and intergeneric hybrids with Salmo trutta. [7] [8]

The splake is an intrageneric hybrid between the brook trout and lake trout (S. namaycush). Although uncommon in nature, they are artificially propagated in substantial numbers for stocking into brook trout or lake trout habitats. [9] Although they are fertile, back-crossing in nature is behaviorally problematic and very little natural reproduction occurs. Splake grow more quickly than brook trout and become piscivorous sooner and are more tolerant of competitors than brook trout. [10]

The tiger trout is an intergeneric hybrid between the brook trout and the Eurasian brown trout ( Salmo trutta ). Tiger trout occur very rarely naturally, but are sometimes artificially propagated. Such crosses are almost always reproductively sterile. They are popular with many fish-stocking programs because they can grow quickly, and may help keep coarse fish (wild non "sport" fish) populations in check due to their highly piscivorous (fish-eating) nature. [11]

The sparctic char is an intrageneric hybrid between the brook trout and the Arctic char (S. alpinus). [12]

Description

Brook trout from lake in Wyoming's Wind River Range Brookie105.jpg
Brook trout from lake in Wyoming's Wind River Range
Captive brook trout in an aquarium Salvelinus fontinalis Prague Vltava 4.jpg
Captive brook trout in an aquarium

The brook trout has a dark green to brown color, with a distinctive marbled pattern (called vermiculation) of lighter shades across the flanks and back and extending at least to the dorsal fin, and often to the tail. A distinctive sprinkling of red dots, surrounded by blue halos, occurs along the flanks. The belly and lower fins are reddish in color, the latter with white leading edges. Often, the belly, particularly of the males, becomes very red or orange when the fish are spawning.[ citation needed ]

Typical lengths of the brook trout vary from 25 to 65 cm (9.8 to 25.6 in), and weights from 0.3 to 3 kg (0.66 to 6.61 lb). The maximum recorded length is 86 cm (34 in) and maximum weight 6.6 kg (15 lb). Brook trout can reach at least seven years of age, with reports of 15-year-old specimens observed in California habitats to which the species has been introduced. Growth rates are dependent on season, age, water and ambient air temperatures, and flow rates. In general, flow rates affect the rate of change in the relationship between temperature and growth rate. For example, in spring, growth increased with temperature at a faster rate with high flow rates than with low flow rates. [13]

Range and habitat

U.S. native and introduced ranges of brook trout (Salvelinus fontinalis) Native Range Brook Trout.JPG
U.S. native and introduced ranges of brook trout (Salvelinus fontinalis)
Native Appalachian brook trout Native brook trout.jpg
Native Appalachian brook trout

Brook trout are native to a wide area of Eastern North America, but are increasingly confined to higher elevations southward in the Appalachian Mountains to northern Georgia and northwest South Carolina, Canada from the Hudson Bay basin east, the Great LakesSaint Lawrence system, the Canadian maritime provinces, and the upper Mississippi River drainage as far west as eastern Iowa. [6] Their southern historic native range has been drastically reduced, with fish being restricted to higher-elevation, remote streams due to habitat loss and introductions of brown and rainbow trout. As early as 1850, the brook trout's range started to extend west from its native range through introductions. The brook trout was eventually introduced into suitable habitats throughout the western U.S. during the late 19th and early 20th centuries at the behest of the American Acclimatization Society and by private, state, and federal fisheries authorities. [15] Acclimatization movements in Europe, South America, and Oceania resulted in brook trout introductions throughout Europe, [12] in Argentina, [16] and New Zealand. [17] Although not all introductions were successful, a great many established wild, self-sustaining populations of brook trout in non-native waters.

Habitat

Typical southern Appalachian brook trout habitat WhiteoakCanyonShenandoahNP.jpg
Typical southern Appalachian brook trout habitat

The brook trout inhabits large and small lakes, rivers, streams, creeks, and spring ponds. They prefer clear waters of high purity and a narrow pH range and are sensitive to poor oxygenation, pollution, and changes in pH caused by environmental effects such as acid rain. The typical pH range of brook trout waters is 5.0 to 7.5, with pH extremes of 3.5 to 9.8 possible. [18] Water temperatures typically range from 34 to 72 °F (1 to 22 °C). Warm summer temperatures and low flow rates are stressful on brook trout populations—especially larger fish. [19]

Coasters

A potamodromous population of brook trout native to Lake Superior, which migrate into tributary rivers to spawn, are called "coasters". [20] Coasters tend to be larger than most other populations of brook trout, often reaching 6 to 7 lb (2.7 to 3.2 kg) in size. [21] Many coaster populations have been severely reduced by overfishing and habitat loss by the construction of hydroelectric power dams on Lake Superior tributaries. In Ontario and Michigan, efforts are underway to restore and recover coaster populations. [22]

Salters

When Europeans first settled Eastern North America, semianadromous or sea-run brook trout, commonly called "salters", ranged from southern New Jersey, north throughout the Canadian maritime provinces, and west to Hudson Bay. Salters may spend up to three months at sea feeding on crustaceans, fish, and marine worms in the spring, not straying more than a few miles from the river mouth. The fish return to freshwater tributaries to spawn in the late summer or autumn. While in salt water, salters gain a more silvery color, losing much of the distinctive markings seen in freshwater. However, within two weeks of returning to fresh water, they assume typical brook trout color and markings. [21]

Ecology and reproduction

Diet

Brook trout have a diverse diet that includes larval, pupal, and adult forms of aquatic insects (typically caddisflies, stoneflies, mayflies, and aquatic dipterans), and adult forms of terrestrial insects (typically ants, beetles, grasshoppers, and crickets) that fall into the water, crustaceans, frogs and other amphibians, molluscs, smaller fish, invertebrates, and even small aquatic mammals such as voles.[ citation needed ]

Reproduction

The female constructs a depression in a location in the stream bed, sometimes referred to as a "redd", where groundwater percolates upward through the gravel. One or more males approach the female, fertilizing the eggs as the female expresses them. A majority of spawnings involve peripheral males which directly influences the number of eggs that survive into adulthood. In general, the larger the number of peripheral males present, the more likely the eggs will be cannibalized. [23] The eggs are slightly denser than water. The female then buries the eggs in a small gravel mound; they hatch in 95 to 100 days.[ citation needed ]

Angling

The brook trout is a popular game fish with anglers, particularly fly fishermen.

Nathan Currier lithograph of Arthur Fitzwilliam Tait's painting "Catching a Trout", 1854 - depicts fishermen catching a brook trout near South Haven Church in a mill pond on Carmans River Long Island, New York. Purportedly it illustrates an occasion when Daniel Webster, an avid angler, caught a large (about 14.5 lb (6.6 kg)) brook trout at the location in 1823 (or 1827). Tait-Catching a Trout (1854).JPG
Nathan Currier lithograph of Arthur Fitzwilliam Tait's painting "Catching a Trout", 1854 - depicts fishermen catching a brook trout near South Haven Church in a mill pond on Carmans River Long Island, New York. Purportedly it illustrates an occasion when Daniel Webster, an avid angler, caught a large (about 14.5 lb (6.6 kg)) brook trout at the location in 1823 (or 1827).
Brook trout chasing an artificial fly from American Fishes (1903) BrookTroutAmericanFishes.JPG
Brook trout chasing an artificial fly from American Fishes (1903)

Until it was displaced by introduced brown trout (1883) and rainbow trout (1875), the brook trout attracted the most attention of anglers from colonial times through the first 100 years of U.S. history. Sporting writers such as Genio Scott Fishing in American Waters (1869), Thaddeus Norris American Anglers Book (1864), Robert Barnwell Roosevelt Game Fish of North America (1864) and Charles Hallock The Fishing Tourist (1873) produced guides to the best-known brook trout waters in America. [26] As brook trout populations declined in the mid-19th century near urban areas, anglers flocked to the Adirondacks in upstate New York and the Rangeley lakes region in Maine to pursue brook trout. [26] In July 1916 on the Nipigon River in northern Ontario, an Ontario physician, John W. Cook, caught a 14.5 lb (6.6 kg) brook trout, which stands as the world record. [27]

Today, many anglers practice catch-and-release tactics to preserve remaining populations, and organizations such as Trout Unlimited have been in the forefront of efforts to institute air and water quality standards sufficient to protect the brook trout. Revenues derived from the sale of fishing licenses have been used to restore many sections of creeks and streams to brook trout habitat. [28]

The current world angling record brook trout was caught by Dr. W. J. Cook on the Nipigon River, Ontario, in July 1915. The 31 in (79 cm) trout weighed only 14.5 lb (6.6 kg) because, at the time of weighing, it was badly decomposed after 21 days in the bush without refrigeration. [29] A 29 in (74 cm) brook trout, caught in October 2006 in Manitoba, is not eligible for record status since it was released alive. [30] This trout weighed about 15.98 lb (7.25 kg) based on the accepted formula for calculating weight by measurements, and it currently stands as the record brook trout for Manitoba. [31]

An angler pulls in a Brook trout using a Tenkara fly rod in Yosemite National Park. Brook trout caught on Tenkara fly rod..jpg
An angler pulls in a Brook trout using a Tenkara fly rod in Yosemite National Park.

Artificial propagation and aquaculture

Brook trout are also commercially raised in large numbers for food production, being sold for human consumption in both fresh and smoked forms. [32] Because of its dependence on pure water and a variety of aquatic and insect life forms, the brook trout is also used for scientific experimentation in assessing the effects of pollution and contaminated waters.[ citation needed ]

Brook trout are also raised commercially and sold to angling organisations or groups to stock their own lakes or ponds. There are businesses that hold a "U-fish license", where the public can come fish at their lake or pond and buy the fish that they catch.

Brook trout are not commonly raised on a commercial scale because they do not grow as fast as other types of fish.

Brook trout raised commercially are often kept in large circular tanks with a constant flow of water going through them. This allows for a current to circulate through the tank and keep it clean, acting as a flush of water that takes fish waste with it. Some more elaborate systems operate on a re-circulation system where the water is filtered and reused.

The fish are typically fed a pelleted food consisting of 40–50% protein and 15% fat. [33] The fish food is usually made from fish oil, animal protein, plant protein and vitamins and minerals. The protein is often sourced from soy beans. [34]

Conservation status

Brook trout populations depend on cold, clear, well-oxygenated water of high purity. As early as the late 19th century, native brook trout in North America became extirpated from many watercourses as land development, forest clear-cutting, and industrialization took hold. [35] Streams and creeks that were polluted, dammed, or silted up often became too warm to hold native brook trout, and were colonized by transplanted smallmouth bass and perch or other introduced salmonids such as brown and rainbow trout. The brown trout, a species not native to North America, has replaced the brook trout in much of the brook trout's native water. Brook trout populations, if already stressed by overharvesting or by temperature, are very susceptible to damage by the introduction of exogenous species. Many lacustrine populations of brook trout have been extirpated by the introduction of other species, particularly percids, but sometimes other spiny-rayed fishes.[ citation needed ]

In addition to chemical pollution and algae growth caused by runoff containing chemicals and fertilizers, air pollution has also been a significant factor in the disappearance of brook trout from their native habitats. In the U.S., acid rain caused by air pollution has resulted in pH levels too low to sustain brook trout in all but the highest headwaters of some Appalachian streams and creeks. [36] Brook trout populations across large parts of eastern Canada have been similarly challenged; a subspecies known as the aurora trout was extirpated from the wild by the effects of acid rain. [37] Today, in many parts of the range, efforts are underway to restore brook trout to those waters that once held native populations, stocking other trout species only in habitats that can no longer be recovered sufficiently to sustain brook trout populations.[ citation needed ]

Organizations such as Trout Unlimited and Trout Unlimited Canada [22] are partnering with other organizations such as the Southern Appalachian Brook Trout Foundation, [38] the Eastern Brook Trout Joint Venture, [39] and state, provincial, and federal agencies to undertake projects that restore native brook trout habitat and populations.[ citation needed ]

As an invasive species

Although brook trout populations are under stress in their native range, they are considered an invasive species where they have been introduced outside their historic native range. [40] [41] [42] In the northern Rocky Mountains, non-native brook trout are considered a significant contributor to the decline or extirpation of native cutthroat trout (Oncorhynchus clarki) in headwater streams. [43] Non-native brook trout populations have been subject to eradication programs in efforts to preserve native species. [44] [45] In Yellowstone National Park, anglers may take an unlimited number of non-native brook trout in some drainages. In the Lamar River drainage, a mandatory kill regulation for any brook trout caught is in effect. [46] In Europe, introduced brook trout, once established, have had negative impacts on growth rates of native brown trout (S. trutta). [12]

Related Research Articles

Trout Number of species of freshwater fish

Trout are species of freshwater fish belonging to the genera Oncorhynchus, Salmo and Salvelinus, all of the subfamily Salmoninae of the family Salmonidae. The word trout is also used as part of the name of some non-salmonid fish such as Cynoscion nebulosus, the spotted seatrout or speckled trout.

Lake trout Species of fish

The lake trout is a freshwater char living mainly in lakes in northern North America. Other names for it include mackinaw, namaycush,lake char (or charr), touladi, togue, and grey trout. In Lake Superior, it can also be variously known as siscowet, paperbelly and lean. The lake trout is prized both as a game fish and as a food fish. Those caught with dark coloration may be called mud hens.

Brown trout Species of fish

The brown trout is a European species of salmonid fish that has been widely introduced into suitable environments globally. It includes purely freshwater populations, referred to as the riverine ecotype, Salmo trutta morpha fario, a lacustrine ecotype, S. trutta morpha lacustris, also called the lake trout, and anadromous forms known as the sea trout, S. trutta morpha trutta. The latter migrates to the oceans for much of its life and returns to fresh water only to spawn. Sea trout in Ireland and Britain have many regional names: sewin in Wales, finnock in Scotland, peal in the West Country, mort in North West England, and white trout in Ireland.

Bull trout Species of fish

The bull trout is a char of the family Salmonidae native to northwestern North America. Historically, S. confluentus has been known as the "Dolly Varden", but was reclassified as a separate species in 1980. Bull trout are listed as a threatened species under the U.S. Endangered Species Act (1998) and as vulnerable on the IUCN Red List of Threatened Species.

Rainbow trout Fresh-water species of fish

The rainbow trout is a trout and species of salmonid native to cold-water tributaries of the Pacific Ocean in Asia and North America. The steelhead is an anadromous (sea-run) form of the coastal rainbow trout(O. m. irideus) or Columbia River redband trout (O. m. gairdneri) that usually returns to fresh water to spawn after living two to three years in the ocean. Freshwater forms that have been introduced into the Great Lakes and migrate into tributaries to spawn are also called steelhead.

Cutthroat trout Species of fish

The cutthroat trout(Oncorhynchus clarkii) is a fish species of the family Salmonidae native to cold-water tributaries of the Pacific Ocean, Rocky Mountains, and Great Basin in North America. As a member of the genus Oncorhynchus, it is one of the Pacific trout, a group that includes the widely distributed rainbow trout. Cutthroat trout are popular gamefish, especially among anglers who enjoy fly fishing. The common name "cutthroat" refers to the distinctive red coloration on the underside of the lower jaw. The specific name clarkii was given to honor explorer William Clark, coleader of the Lewis and Clark Expedition.

Golden trout Species of fish

The Golden Trout, also known as the Californiangolden trout (Oncorhynchus aguabonita or Oncorhynchus mykiss aguabonita), is a species of trout native to California. The golden trout is normally found in the Golden Trout Creek, Volcano Creek, and the South Fork Kern River. It is the state freshwater fish of California.

Arctic char Species of fish

The Arctic char or Arctic charr is a cold-water fish in the family Salmonidae, native to alpine lakes and arctic and subarctic coastal waters. Its distribution is Circumpolar North. It spawns in freshwater and populations can be lacustrine, riverine, or anadromous, where they return from the ocean to their fresh water birth rivers to spawn. No other freshwater fish is found as far north; it is, for instance, the only fish species in Lake Hazen on Ellesmere Island in the Canadian Arctic. It is one of the rarest fish species in Britain and Ireland, found mainly in deep, cold, glacial lakes, and is at risk from acidification. In other parts of its range, such as the Nordic countries, it is much more common, and is fished extensively. In Siberia, it is known as golets and it has been introduced in lakes where it sometimes threatens less hardy endemic species, such as the small-mouth char and the long-finned char in Elgygytgyn Lake.

Sea trout Form of brown trout

Sea trout is the common name usually applied to anadromous forms of brown trout, and is often referred to as Salmo trutta morpha trutta. Other names for anadromous brown trout are sewin (Wales), peel or peal, mort, finnock (Scotland), white trout (Ireland) and salmon trout (culinary). The term sea trout is also used to describe other anadromous salmonids—coho salmon, brook trout, Arctic char, cutthroat trout and Dolly Varden. Even some non-salmonid species are also commonly known as sea trout—Northern pikeminnow and members of the weakfish family (Cynoscion).

Silver trout Extinct species of fish

The silver trout is an extinct char species or variety that inhabited a few waters in New Hampshire prior to 1939, when a biological survey conducted on the Connecticut watershed by the New Hampshire Fish and Game Department found none.

Dolly Varden trout Species of fish

The Dolly Varden trout is a species of salmonid native to cold-water tributaries of the Pacific Ocean in Asia and North America. It is in the genus Salvelinus of true chars, which includes 51 recognized species, the most prominent being the brook, lake and bull trout, as well as Arctic char. Although many populations are semi-anadromous, fluvial and lacustrine populations occur throughout its range. It is considered by taxonomists as part of the Salvelinus alpinus or Arctic char complex, as many populations of bull trout, Dolly Varden trout and Arctic char overlap.

<i>Salvelinus</i> Genus of fishes

Salvelinus is a genus of salmonid fish often called char or charr; some species are called "trout". Salvelinus is a member of the subfamily Salmoninae within the family Salmonidae. The genus has a northern circumpolar distribution, and most of its members are typically cold-water fish that primarily inhabit fresh waters. Many species also migrate to the sea.

The aurora trout, Salvelinus fontinalis timagamiensis, is a variant or subspecies of the brook trout native to two lakes in the Temagami District of Ontario, Canada. The existence of the fish was brought to the attention of the angling world by four American anglers who were taken by Archie King of Latchford, Ontario, into Ontario's Lady Evelyn River system in 1923. Recognizing the fish as different or unique, the anglers took a specimen back to the Carnegie Museum in Pittsburgh, in the United States, where Dr. Arthur W. Henn was asked to identify the fish. He wrote about the fish in 1925 wherein he and Rinckenbach identified it as a distinct species, Salvelinus timagamiensis, but since a seminal re-examination of the material by Sale in 1967, taxonomists now agree the fish is, in a fact, at most a subspecies of the brook trout, named Salvelinus fontinalis timagamiensis. Genetic data has not yet supported its taxonomic distinction.

Lahontan cutthroat trout Subspecies of fish

Lahontan cutthroat trout is the largest subspecies of cutthroat trout, and the state fish of Nevada. It is one of three subspecies of cutthroat trout that are listed as federally threatened.

Yellowstone cutthroat trout Subspecies of fish

The Yellowstone cutthroat trout is a subspecies of the cutthroat trout. It is a freshwater fish in the salmon family. Native only to a few U.S. states, their original range was upstream of Shoshone Falls on the Snake River and tributaries in Wyoming, also across the Continental Divide in Yellowstone Lake and in the Yellowstone River as well as its tributaries downstream to the Tongue River in Montana. The species is also found in Idaho, Utah and Nevada.

Splake Species of fish

The splake or slake is a hybrid of two fish species resulting from the crossing of a male brook trout and a female lake trout. The name itself is a portmanteau of speckled trout and lake trout, and may have been used to describe such hybrids as early as the 1880s. Hybrids of the male lake trout with the female brook trout have also been produced, but are not as successful.

Manistee River river in Northwest lower Michigan

The Manistee River, sometimes referred to as the Big Manistee River, runs 190 miles (310 km) through the northwestern Lower Peninsula of Michigan; it now passes through the contemporary villages of Sharon, Smithville, and Mesick, entering Lake Michigan at Manistee. It is considered, like the nearby Au Sable River, to be one of the best trout fisheries east of the Rockies. The Manistee River is also being considered for restoration of Arctic grayling, which have been extirpated from the State of Michigan since 1936.

Coastal cutthroat trout Subspecies of fish

The coastal cutthroat trout, also known as the sea-run cutthroat trout, blue-back trout or harvest trout, is one of the several subspecies of cutthroat trout found in Western North America. The coastal cutthroat trout occurs in four distinct forms. A semi-anadromous or sea-run form is the most well known. Freshwater forms occur in both large and small rivers and streams and lake environments. The native range of the coastal cutthroat trout extends south from the southern coastline of the Kenai Peninsula in Alaska to the Eel River in Northern California. Coastal cutthroat trout are resident in tributary streams and rivers of the Pacific basin and are rarely found more than 100 miles (160 km) from the ocean.

Sunapee trout Subspecies of fish

The Sunapee trout; also called blueback trout, Sunapee Golden trout, or Quebec red trout; is a putative subspecies of Arctic char native to the northeast United States, Québec, and New Brunswick. Originally described as three separate species--S. oquassa, the blueback trout of Lake Oquassa in Maine (1854), S. aureolus the golden trout of Sunapee lake in New Hampshire (1888) and S. marstoni the Quebec red trout (1893).

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Further reading