78-516: (Redirected from Speckled Trout ) Speckled trout may refer to: Brook trout ( Salvelinus fontinalis ), a freshwater fish in the family Salmonidae Cynoscion nebulosus , also called spotted seatrout, a coastal saltwater or brackish water fish in the family Sciaenidae (drums) The modified C-135 Stratolifter used by the United States Air Force Chief of Staff Topics referred to by
156-409: 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
234-617: A great many established wild, self-sustaining populations of brook trout in non-native waters. The brook trout inhabits large and small lakes , rivers , streams , creeks, and spring ponds in cold temperate climates with mild precipitation . Clear spring water with adequate cover and moderate flow rates is indicative of strong habitability for Brook trout. They exhibit high levels of adaptability when exposed to habitat changes from environmental effects, and have been observed to exhibit more resilience to habitat change than other Salvelinus species. The typical pH range of brook trout waters
312-468: A larger Pancrustacea clade . The traditional classification of Crustacea based on morphology recognised four to six classes. Bowman and Abele (1982) recognised 652 extant families and 38 orders, organised into six classes: Branchiopoda , Remipedia , Cephalocarida , Maxillopoda, Ostracoda , and Malacostraca . Martin and Davis (2001) updated this classification, retaining the six classes but including 849 extant families in 42 orders. Despite outlining
390-468: A limbless abdomen, except from a telson and caudal rami which is present in many groups. The abdomen in malacostracans bears pleopods , and ends in a telson, which bears the anus , and is often flanked by uropods to form a tail fan . The number and variety of appendages in different crustaceans may be partly responsible for the group's success. Crustacean appendages are typically biramous , meaning they are divided into two parts; this includes
468-473: A more silvery color, losing much of the distinctive markings seen in freshwater. However, within two weeks of returning to freshwater, they assume typical brook trout color and markings. Salters have faced threats such as habitat destruction , water pollution , and water way damming that have led to their declining population numbers across the Northeastern United States . The brook trout has
546-407: A part of the subphylum Crustacea ( / k r ə ˈ s t eɪ ʃ ə / ), a large, diverse group of mainly aquatic arthropods including decapods ( shrimps , prawns , crabs , lobsters and crayfish ), seed shrimp , branchiopods , fish lice , krill , remipedes , isopods , barnacles , copepods , opossum shrimps , amphipods and mantis shrimp . The crustacean group can be treated as
624-424: A short-lived form of brook trout that inhabit smaller bodies of water and exhibit less predacious behavior than coasters. They may spend up to three months at sea feeding on crustaceans, fish, and marine worms in the spring. During this time they won't stray more than a few miles from the river mouth, but then return to freshwater tributaries to spawn in the late summer or autumn. While in saltwater, salters gain
702-417: 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. Brook trout populations across large parts of eastern Canada have been similarly challenged; a subspecies known as the aurora trout was extirpated from
780-575: A species not native to North America, has replaced the brook trout in much of the brook trout's native water. If already stressed by overharvesting or by temperature, brook trout populations 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 . In addition to chemical pollution and algae growth caused by runoff containing chemicals and fertilizers, air pollution has also been
858-487: A spiral format. Structures that function as kidneys are located near the antennae. A brain exists in the form of ganglia close to the antennae, and a collection of major ganglia is found below the gut. In many decapods , the first (and sometimes the second) pair of pleopods are specialised in the male for sperm transfer. Many terrestrial crustaceans (such as the Christmas Island red crab ) mate seasonally and return to
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#1732852332374936-577: A subphylum under the clade Mandibulata . It is now well accepted that the hexapods ( insects and entognathans ) emerged deep in the Crustacean group, with the completed pan-group referred to as Pancrustacea . The three classes Cephalocarida , Branchiopoda and Remipedia are more closely related to the hexapods than they are to any of the other crustaceans ( oligostracans and multicrustaceans ). The 67,000 described species range in size from Stygotantulus stocki at 0.1 mm (0.004 in), to
1014-894: A threat to native brook trout populations. Arguments against artificial propagation of brook trout claim that it can cause a degradation of the overall genetic pool due to the possibility of inbreeding among individuals. This lack of genetic variation could lead to certain populations of brook trout to become extirpated from their deficiency in adaptability . 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. 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 ,
1092-530: Is 5.0 to 7.5, with pH extremes of 3.5 to 9.8 possible. 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. Brook trout have a diverse diet that includes larval , pupal , adult forms of aquatic insects (typically caddisflies , stoneflies , mayflies , and aquatic dipterans ), adult forms of terrestrial insects (typically ants , beetles , grasshoppers , and crickets ) that fall into
1170-535: Is a subspecies native to two lakes in the Temagami District of Ontario , Canada. The silver trout ( S. agassizii or S. f. agassizii ) is an extinct trout species or subspecies last seen in Dublin Pond , New Hampshire , in 1930. It is considered by fisheries biologist Robert J. Behnke as a highly specialized form of brook trout. The brook trout produces hybrids both with its congeners
1248-424: Is also known as the eastern brook trout , speckled trout , brook char (or charr ), squaretail , brookie , or mud trout , among others. Adult coaster brook trout are capable of reaching sizes over 2 feet in length and weigh up to 6.8 kg (15 lb), whereas adult salters average between 6 and 15 inches in length and weigh between 0.5 and 2.3 kg (1 and 5 lb). The brook trout
1326-438: Is an open circulatory system , where blood is pumped into the haemocoel by a heart located near the dorsum. Malacostraca have haemocyanin as the oxygen-carrying pigment, while copepods, ostracods, barnacles and branchiopods have haemoglobins . The alimentary canal consists of a straight tube that often has a gizzard-like "gastric mill" for grinding food and a pair of digestive glands that absorb food; this structure goes in
1404-800: Is an intrageneric hybrid between the brook trout and the Arctic char. The US Forest Service has recognized two ecological forms of brook trout, salters and coasters . The forms express the same general features but vary in size, behavior, and location. A potamodromous population of brook trout native to lacustrine regions, which migrate into tributary rivers to spawn , are called "coasters". 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. They also commonly live for longer periods of time and exhibit more predacious behavior than their counterparts. Many coaster populations have been severely reduced by overfishing and habitat loss by
1482-661: Is behaviorally problematic and very little natural reproduction occurs. Splake grow more quickly than brook trout, become piscivorous sooner, and are more tolerant of competitors than brook trout. The tiger trout is an intergeneric hybrid between the brook trout and the brown trout. Tiger trout rarely occur 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. The sparctic char
1560-508: Is characterized by its distinctive olive-green body with yellow and blue-rimmed red spots, white and black edged orange fins , and dorsal vermiculation . The diet of the brook trout is restrictive to the season and location of the fish, but will typically consist of terrestrial and aquatic insects , fry , crustaceans , zooplankton , and worms . Throughout history, non-native brook trout have been transplanted beyond its native borders, where it has spread across North America and much of
1638-417: Is different from Wikidata All article disambiguation pages All disambiguation pages Brook trout † S. f. agassizii (Garman, 1885) S. f. timagamiensis Henn & Rinckenbach, 1925 The brook trout ( Salvelinus fontinalis ) is a species of freshwater fish in the char genus Salvelinus of the salmon family Salmonidae native to Eastern North America in
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#17328523323741716-479: Is filtered and reused). The fish are typically fed a pelleted food consisting of 40–50% protein and 15% fat made from fish oil , animal protein, plant protein and vitamins and minerals. Finally, once the fish have reached a viable size, around 2 inches in length, they are released into the wild. This means of brook trout aquaculture has sparked controversy due to potential decrease in the fishes fitness, adaptability, and environmental resilience, effectively posing
1794-669: Is some debate as to whether or not Cambrian animals assigned to Ostracoda are truly ostracods , which would otherwise start in the Ordovician . The only classes to appear later are the Cephalocarida , which have no fossil record, and the Remipedia , which were first described from the fossil Tesnusocaris goldichi , but do not appear until the Carboniferous . Most of the early crustaceans are rare, but fossil crustaceans become abundant from
1872-521: Is thought to be just 1 ⁄ 10 to 1 ⁄ 100 of the total number as most species remain as yet undiscovered . Although most crustaceans are small, their morphology varies greatly and includes both the largest arthropod in the world – the Japanese spider crab with a leg span of 3.7 metres (12 ft) – and the smallest, the 100- micrometre -long (0.004 in) Stygotantulus stocki . Despite their diversity of form, crustaceans are united by
1950-611: The Marmorkrebs crayfish. In many crustaceans, the fertilised eggs are released into the water column , while others have developed a number of mechanisms for holding on to the eggs until they are ready to hatch. Most decapods carry the eggs attached to the pleopods , while peracarids , notostracans , anostracans , and many isopods form a brood pouch from the carapace and thoracic limbs. Female Branchiura do not carry eggs in external ovisacs but attach them in rows to rocks and other objects. Most leptostracans and krill carry
2028-707: The Appalachian Mountains to northern Georgia and northwest South Carolina , Canada from the Hudson Bay basin east, the Great Lakes – Saint Lawrence system, the Canadian maritime provinces , and the upper Mississippi River drainage as far west as eastern Iowa . 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,
2106-698: The Carboniferous , as are the first true mantis shrimp. In the Decapoda , prawns and polychelids appear in the Triassic, and shrimp and crabs appear in the Jurassic . The fossil burrow Ophiomorpha is attributed to ghost shrimps, whereas the fossil burrow Camborygma is attributed to crayfishes. The Permian–Triassic deposits of Nurra preserve the oldest (Permian: Roadian) fluvial burrows ascribed to ghost shrimps (Decapoda: Axiidea, Gebiidea) and crayfishes (Decapoda: Astacidea, Parastacidea), respectively. However,
2184-465: The Carboniferous period onwards. Within the Malacostraca, no fossils are known for krill , while both Hoplocarida and Phyllopoda contain important groups that are now extinct as well as extant members (Hoplocarida: mantis shrimp are extant, while Aeschronectida are extinct; Phyllopoda: Canadaspidida are extinct, while Leptostraca are extant ). Cumacea and Isopoda are both known from
2262-401: The Japanese spider crab with a leg span of up to 3.8 m (12.5 ft) and a mass of 20 kg (44 lb). Like other arthropods , crustaceans have an exoskeleton , which they moult to grow. They are distinguished from other groups of arthropods, such as insects , myriapods and chelicerates , by the possession of biramous (two-parted) limbs, and by their larval forms , such as
2340-460: The Lamar River watershed, a mandatory kill regulation for any brook trout caught is in effect. In Europe, introduced brook trout, once established, have had negative impacts on growth rates of native brown trout ( S. trutta ). Crustacean Crustaceans (from Latin meaning: "those with shells" or "crusted ones") are invertebrate animals that constitute one group of arthropods that are
2418-650: The United States and Canada . Two ecological forms of brook trout have been recognized by the US Forest Service . One ecological form is short-lived potamodromous populations in Lake Superior known as coaster trout or coasters . The second ecological form is the long-living predaceous anadromous populations which are found in northern lakes and coastal rivers from Long Island to Hudson Bay , which are referred to as salters . In parts of its range, it
Speckled trout - Misplaced Pages Continue
2496-617: The aurora trout , are listed as endangered by the Committee on the Status of Endangered Wildlife in Canada . The scientific name of the brook trout is Salvelinus fontinalis . Initially, the brook trout was scientifically described as Salmo fontinalis by the naturalist Samuel Latham Mitchill in 1814. The species was later moved to the char genus Salvelinus , which in North America also includes
2574-494: The lake trout (S. namaycush ) and the Arctic char ( S. alpinus ), and intergeneric hybrids with the brown trout ( Salmo trutta ). 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. Although they are fertile , back-crossing in nature
2652-452: The lake trout , bull trout , Dolly Varden , and the Arctic char . 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. There is little recognized systematic substructure in the brook trout, but the two subspecies have been proposed. The aurora trout ( S. f. timagamiensis )
2730-553: The list of the top 100 globally invasive species . Since the 19th century, isolated native eastern brook trout populations have faced extirpation due to stream pollution , habitat destruction , invasive species , and waterway damming . Although facing these pressures, the brook trout is not listed as an endangered species by the International Union for Conservation of Nature , but native population decline has been observed. Some local subspecies of brook trout, such as
2808-629: The nauplius stage of branchiopods and copepods . Most crustaceans are free-living aquatic animals , but some are terrestrial (e.g. woodlice , sandhoppers ), some are parasitic (e.g. Rhizocephala , fish lice , tongue worms ) and some are sessile (e.g. barnacles ). The group has an extensive fossil record , reaching back to the Cambrian . More than 7.9 million tons of crustaceans per year are harvested by fishery or farming for human consumption, consisting mostly of shrimp and prawns . Krill and copepods are not as widely fished, but may be
2886-413: The pereon or thorax , and the pleon or abdomen . The head and thorax may be fused together to form a cephalothorax , which may be covered by a single large carapace . The crustacean body is protected by the hard exoskeleton , which must be moulted for the animal to grow. The shell around each somite can be divided into a dorsal tergum , ventral sternum and a lateral pleuron. Various parts of
2964-515: The zoea (pl. zoeæ or zoeas ). This name was given to it when naturalists believed it to be a separate species. It follows the nauplius stage and precedes the post-larva . Zoea larvae swim with their thoracic appendages , as opposed to nauplii, which use cephalic appendages, and megalopa, which use abdominal appendages for swimming. It often has spikes on its carapace , which may assist these small organisms in maintaining directional swimming. In many decapods , due to their accelerated development,
3042-702: The Asian shore crab, Hemigrapsus sanguineus . Since the opening of the Suez Canal , close to 100 species of crustaceans from the Red Sea and the Indo-Pacific realm have established themselves in the eastern Mediterranean sub-basin, with often significant impact on local ecosystems. Most crustaceans have separate sexes , and reproduce sexually . In fact, a recent study explains how the male T. californicus decide which females to mate with by dietary differences, preferring when
3120-683: The Hexapoda is distinctly closer to e.g. a Multicrustacean than an Oligostracan is. Crustaceans have a rich and extensive fossil record , which begins with animals such as Canadaspis and Perspicaris from the Middle Cambrian age Burgess Shale . Most of the major groups of crustaceans appear in the fossil record before the end of the Cambrian, namely the Branchiopoda , Maxillopoda (including barnacles and tongue worms ) and Malacostraca ; there
3198-442: The accepted formula for calculating weight by measurements, and it currently stands as the record brook trout for Manitoba . Since the 1800s, brook trout populations have been grown by artificial propagation and aquaculture . Artificial propagation in fish is the process by which eggs are inseminated , hatched, and grown in a controlled environment that minimizes unfavorable environmental pressures. The fish are then released into
Speckled trout - Misplaced Pages Continue
3276-627: The age of 4. The brook trout is a popular game fish with anglers , particularly fly fishermen . 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
3354-406: The animals with the greatest biomass on the planet, and form a vital part of the food chain. The scientific study of crustaceans is known as carcinology (alternatively, malacostracology , crustaceology or crustalogy ), and a scientist who works in carcinology is a carcinologist . The body of a crustacean is composed of segments, which are grouped into three regions: the cephalon or head ,
3432-666: The best-known brook trout waters in America. 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. 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
3510-735: 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. Acclimatization movements in Europe, South America, and Oceania resulted in brook trout introductions throughout Europe, in Argentina , and New Zealand . Although not all introductions were successful,
3588-501: The construction of hydroelectric power dams on Lake Superior tributaries. In Ontario , Michigan , and Minnesota efforts are underway to restore and recover coaster populations. When Europeans first settled in Eastern North America , semi- anadromous 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 are
3666-419: The deposition of up to 5,000 eggs in gravel beds by the female brook trout, the eggs enter an incubation period from the winter months to early spring. During this incubation period , the eggs source oxygen from the stream that passes through the gravel beds and into their gel-like shells . The eggs will then successively hatch into miniature fry that rely upon their yolk sac for nutrients to compensate for
3744-407: The eggs as the female expresses them. Most spawning 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. The eggs are slightly denser than water. The female then buries the eggs in a small gravel mound where they hatch in 4 to 6 weeks. Following
3822-448: The eggs between their thoracic limbs; some copepods carry their eggs in special thin-walled sacs, while others have them attached together in long, tangled strings. Crustaceans exhibit a number of larval forms, of which the earliest and most characteristic is the nauplius . This has three pairs of appendages , all emerging from the young animal's head, and a single naupliar eye. In most groups, there are further larval stages, including
3900-399: The eggs have begun to hatch, the fry are transported into rearing tanks where they will grow and develop before their release into the wild. Their rearing tanks typically consist of large circular tanks with a constant water flow going through them to allow a current to circulate through the tank and keep it clean (some more elaborate systems operate on a re-circulation system where the water
3978-679: The evidence that Maxillopoda was non-monophyletic, they retained it as one of the six classes, although did suggest that Maxillipoda could be replaced by elevating its subclasses to classes. Since then phylogenetic studies have confirmed the polyphyly of Maxillipoda and the paraphyletic nature of Crustacea with respect to Hexapoda. Recent classifications recognise ten to twelve classes in Crustacea or Pancrustacea, with several former maxillopod subclasses now recognised as classes (e.g. Thecostraca , Tantulocarida , Mystacocarida , Copepoda , Branchiura and Pentastomida ). The following cladogram shows
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#17328523323744056-444: The exoskeleton may be fused together. Each somite , or body segment can bear a pair of appendages : on the segments of the head, these include two pairs of antennae , the mandibles and maxillae ; the thoracic segments bear legs , which may be specialised as pereiopods (walking legs) and maxillipeds (feeding legs). Malacostraca and Remipedia (and the hexapods) have abdominal appendages. All other classes of crustaceans have
4134-456: The females are algae-fed instead of yeast-fed. A small number are hermaphrodites , including barnacles , remipedes , and Cephalocarida . Some may even change sex during the course of their life. Parthenogenesis is also widespread among crustaceans, where viable eggs are produced by a female without needing fertilisation by a male. This occurs in many branchiopods , some ostracods , some isopods , and certain "higher" crustaceans, such as
4212-662: The great radiation of crustaceans occurred in the Cretaceous , particularly in crabs, and may have been driven by the adaptive radiation of their main predators, bony fish . The first true lobsters also appear in the Cretaceous. Many crustaceans are consumed by humans, and nearly 10,700,000 tons were harvested in 2007; the vast majority of this output is of decapod crustaceans : crabs , lobsters , shrimp , crawfish , and prawns . Over 60% by weight of all crustaceans caught for consumption are shrimp and prawns, and nearly 80%
4290-464: The lack of nutrients provided by the parental trout during the early stages of development. In the ensuing stage of their life cycle, the fry will seek cover from predatory species in rock crevices and inlets. During this period of hiding, the trout will begin to mature into fingerlings by summer and start expressing parr marks to aid in camouflage. At this point, most brook trout will be between 2 and 3 inches in length. Finally, in succeeding months,
4368-422: The layer allow light to reach the retina. As the larvae mature into adults, the layer migrates to a new position behind the retina where it works as a backscattering mirror that increases the intensity of light passing through the eyes, as seen in many nocturnal animals. In an effort to understand whether DNA repair processes can protect crustaceans against DNA damage , basic research was conducted to elucidate
4446-494: The males, becomes very red or orange when the fish are spawning. 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
4524-624: 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. Invasive brook trout populations may provoke territorial competition with the native cutthroat trout that can impede the recovery efforts of cutthroat trout by environmental agencies. Non-native brook trout populations have been subject to eradication programs in efforts to preserve native species. In Yellowstone National Park , anglers may take an unlimited number of non-native brook trout in some watersheds. In
4602-401: The oceans as insects are on land. Most crustaceans are also motile , moving about independently, although a few taxonomic units are parasitic and live attached to their hosts (including sea lice , fish lice , whale lice , tongue worms , and Cymothoa exigua , all of which may be referred to as "crustacean lice"), and adult barnacles live a sessile life – they are attached headfirst to
4680-429: The repair mechanisms used by Penaeus monodon (black tiger shrimp). Repair of DNA double-strand breaks was found to be predominantly carried out by accurate homologous recombinational repair. Another, less accurate process, microhomology-mediated end joining , is also used to repair such breaks. The expression pattern of DNA repair related and DNA damage response genes in the intertidal copepod Tigriopus japonicus
4758-469: The same term [REDACTED] This disambiguation page lists articles associated with the title Speckled trout . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Speckled_trout&oldid=842312175 " Categories : Disambiguation pages Fish common name disambiguation pages Hidden categories: Short description
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#17328523323744836-446: The sea to release the eggs. Others, such as woodlice , lay their eggs on land, albeit in damp conditions. In most decapods, the females retain the eggs until they hatch into free-swimming larvae. Most crustaceans are aquatic, living in either marine or freshwater environments, but a few groups have adapted to life on land, such as terrestrial crabs , terrestrial hermit crabs , and woodlice . Marine crustaceans are as ubiquitous in
4914-510: The second pair of antennae, but not the first, which is usually uniramous , the exception being in the Class Malacostraca where the antennules may be generally biramous or even triramous. It is unclear whether the biramous condition is a derived state which evolved in crustaceans, or whether the second branch of the limb has been lost in all other groups. Trilobites , for instance, also possessed biramous appendages. The main body cavity
4992-473: The special larval form known as the nauplius . The exact relationships of the Crustacea to other taxa are not completely settled as of April 2012 . Studies based on morphology led to the Pancrustacea hypothesis, in which Crustacea and Hexapoda ( insects and allies) are sister groups . More recent studies using DNA sequences suggest that Crustacea is paraphyletic , with the hexapods nested within
5070-492: 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. Brook trout are native to a wide area of Eastern North America , but are increasingly confined to higher elevations southward in
5148-500: The substrate and cannot move independently. Some branchiurans are able to withstand rapid changes of salinity and will also switch hosts from marine to non-marine species. Krill are the bottom layer and most important part of the food chain in Antarctic animal communities. Some crustaceans are significant invasive species , such as the Chinese mitten crab, Eriocheir sinensis , and
5226-448: The temperature of the adult trout's propagation tank to mimic the seasonal changes associated with brook trout spawning season . The acclimated trout are then collected, and the eggs are gently massaged out of the female trout into a collection vessel, and then inseminated with the milt of a male brook. Next, the inseminated eggs are strained of the milt and transferred to a jar for several weeks to develop into viable embryos . Once
5304-401: The trout will fully mature into a trout that is approximately between 10 and 34 inches long and capable of spawning in the fall months. These fully developed adult brook trout will express a vibrant olive-green back, cherry red underbelly, black accented fins, and wavy dorsal patterns. A typical adult brook trout will live to the age of 3 to 4 years old, with occasional brooks living to over
5382-412: The updated relationships between the different extant groups of the paraphyletic Crustacea in relation to the class Hexapoda . Ostracoda Mystacocarida Branchiura Pentastomida Malacostraca Copepoda Tantulocarida Thecostraca Cephalocarida Branchiopoda Remipedia Hexapoda According to this diagram, the Hexapoda are deep in the Crustacea tree, and any of
5460-401: The water, crustaceans , frogs and other amphibians , molluscs , smaller fish, invertebrates, and even small aquatic mammals such as voles and sometimes other young brook trout. 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
5538-722: The wild by the effects of acid rain. Organizations such as Trout Unlimited and Trout Unlimited Canada are partnering with other organizations such as the Southern Appalachian Brook Trout Foundation, the Eastern Brook Trout Joint Venture, and state, provincial, and federal agencies to undertake projects that restore native brook trout habitat and populations. 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. In
5616-457: The wild when they have reached the appropriate age and size. This process was introduced as a way to counteract the effects of overfishing and aquatic habitat loss and to reinforce brook trout populations across the Northeastern United States . Hatchery rearing was also introduced to raise brook trout in large numbers for food production and sale for human consumption. The process of artificial propagation in brook trout begins by decreasing
5694-456: The world record. Today, many anglers practice catch-and-release tactics to preserve remaining populations. Organizations such as Trout Unlimited have been at 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. The current world angling record brook trout
5772-429: The world. These brook trout have been introduced since the 1800s by means of artificial propagation and aquaculture in hope of promoting fishery resources. Through this transplantation, brook trout have been observed to affect native populations by outcompeting, preying upon, and hybridizing with many native aquatic species. This invasive nature via human-mediated introductory has led to their classification in
5850-426: The zoea is the first larval stage. In some cases, the zoea stage is followed by the mysis stage, and in others, by the megalopa stage, depending on the crustacean group involved. Providing camouflage against predators, the otherwise black eyes in several forms of swimming larvae are covered by a thin layer of crystalline isoxanthopterin that gives their eyes the same color as the surrounding water, while tiny holes in
5928-447: Was analyzed after ultraviolet irradiation. This study revealed increased expression of proteins associated with the DNA repair processes of non-homologous end joining , homologous recombination , base excision repair and DNA mismatch repair . The name "crustacean" dates from the earliest works to describe the animals, including those of Pierre Belon and Guillaume Rondelet , but the name
6006-661: 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. A 29 in (74 cm) brook trout, caught in October 2006 in Manitoba, is not eligible for record status since it was released alive. This trout weighed about 15.98 lb (7.25 kg) based on
6084-412: Was not used by some later authors, including Carl Linnaeus , who included crustaceans among the " Aptera " in his Systema Naturae . The earliest nomenclatural valid work to use the name "Crustacea" was Morten Thrane Brünnich 's Zoologiæ Fundamenta in 1772, although he also included chelicerates in the group. The subphylum Crustacea comprises almost 67,000 described species , which
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