Faxonius erichsonianusbugguide.net Orconectes erichsonianus species information. is a species in the family Cambaridae ("crayfishes"), in the order Decapoda ("crabs, crayfishes, lobsters, prawns, and shrimp"). A common name for Faxonius erichsonianus is reticulate crayfish.
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Bathynectes piperitus is a species of crabs, crayfishes, lobsters, prawns, and shrimp in the family Polybiidae. It is found in Angola, Cabinda, Cape Verde, Fao Fishing Area, Gabon, Ghana, Guinea, Guinea-Bissau, Ivory Coast, Liberia, Senegal, and West Africa.
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An Illinois State University report that focused on studies conducted on the Fox River and Des Plaines River watershed stated that rusty crayfish, initially caught as bait in a different environment, were dumped into the water and "outcompeted the native clearwater crayfish." Other studies confirmed that transporting crayfish to different environments have led to various ecological problems, including the elimination of native species. Transporting crayfishes as live bait has also contributed to the spread of zebra mussels in various waterways throughout Europe and North America, as they are known to attach themselves to exoskeleton of crayfishes.
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Historical and current distribution of Appalachian primary burrowing crayfishes (Decapoda: Astacoidea: Cambaridae) in western Pennsylvania: a century of change or stasis? Journal of Crustacean Biology 37(5):1-9.Foltz II, Damis, Sadecky, Cyprych & Loughman (2016). The crayfish of Tomlinson Run State Park, Hancock County, West Virginia, USA.
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It will also aggessivley lunge at other species which approach the nest. The saffron shiner (Notropis rubricroceus) has been recorded associating with nesting Dixie chubs. The Dixie chub is omnivorous and has been recorded eating variety of animal and plant material, including insects, worms, fishes, mollusks, crayfishes, and plant material.
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Spotted bass usually feed on small fishes, crayfishes, and aquatic insects. The young begin with copepods and other small crustaceans and soon begin to eat insects. The spotted bass's diet falls in between the largemouth and small mouth bass. It isn't nearly as predatory as the large mouth and only consumes about half the amount of the fish.
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Stomachs of eels less than 40 cm and captured in streams contained mainly aquatic insect larvae, whereas larger eels fed predominantly on fishes and crayfishes. Insect abundance decreased in larger eels. The eel diet adapts to seasonal changes and the immediate environment. Feeding activity decreases or stops during the winter, and food intake ceases as eels physiologically prepare for the spawning migration.
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Activities known to be detrimental to the spikedace are the removal of water from their habitats, stream impoundment, channelization, domestic livestock grazing, timber harvesting, mining, road construction, polluting, and stocking non-native species. Threats to the species include stream flow depletion; diversion; habitat alteration and competition with non-native crayfishes; and predation by and competition with non-native fishes, especially red shiner.
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Other present kinds are the tree-frog, the green lizard, the toad ("óttu"), the snail (the white one and that great ochre)("ciammétta"), the water snake and the viper. Even if it is interesting, one pass over a lot of kinds of insects elsewhere disappeared for the intensive agriculture. One finally signalises the presence of trout and crayfishes in the torrents; these last, once present, are now in phase of reintroduction.
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Contamination of the lake environment by chromium started in the 1950s, and has increased dramatically until at least 2005, reaching 20 times natural background levels. It originates in industrial activities that involve leather tanning in the shoe factory of Calzado Cobán. The chromium does not seem to accumulate along the food chain, as it is not found in fishes and crayfishes. However, it accumulates massively in water hyacinth roots and, from there, is transferred to lake sediments through shedding of roots to the lake floor.
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The spined loach was discovered in 2002 and occasionally salmon and brown trout find their way into the lake, the later introduced in a local brook in 1992-93. The invasive bivalve zebra mussel was first documented in Lake Mälaren in the 1920s and was confirmed in Albysjön in 2002. Other molluscs include painter's mussel, duck mussel, river nerite, and river snail. Crayfishes are not documented in the lake but as the signal crayfish is present throughout Lake Mälaren it is believed to be present in Albysjön as well.
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Additionally, there a range of introduced species such as lake trout, char, salmon, and spined loach. The presence of fourhorn sculpins is a reminder from the time when lake Mälaren was a still bay forming part of the Baltic Sea. Vårbyfjärden was one of the first maritime environments in Sweden to suffer crayfish plague which hit the lake in 1907. The plague was introduced in Lake Mälaren by affected animals thrown into the water at Kornhamnstorg in central Stockholm, from where ships carrying crayfishes spread the disease further inland.
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The rusty crayfish (Faxonius rusticus) is a large, aggressive species of freshwater crayfish which is native to the United States, in the Ohio River Basin in parts of Ohio, Kentucky, and Indiana. Its range is rapidly expanding across much of eastern North America, displacing native crayfishes in the process. The rusty crayfish was first captured in Illinois in 1973, and has been collected at over 20 locations in the northern portion of the state. In 2005, F. rusticus was found for the first time west of the Continental Divide, in the John Day River, Oregon, which runs into the Columbia River.
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Commonly found in the rivers and streams of the Appalachian regions of Kentucky, Virginia, and West Virginia, the Big Sandy crayfish was first found in portions of Dickenson County, Virginia’s Big Sandy basin in 1937. Concurrent surveys showed that the species lived in surrounding areas as well. The range of the species was originally much larger but has now been cut down to a smaller size due to a variety of factors, including industrial scale forestry and coal mining. The erosion and sedimentation associated with these activities degraded the streams in the region and made most of them unsuitable for the crayfishes.
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Fish species native to the lake include northern pike, perch, roach, and, to some degree, rudd. There are many introduced species such as rainbow trout, North American brook trout, trout, and the hybrid species splake making the lake well-attended by anglers during both summers and winters. Crayfish plague eliminated the population of noble crayfish in 1987, but some 1.200 signal crayfishes were introduced in the early 1990s. Common birds are mallard and common gull, but other species such as common goldeneye, common tern, and a couple of black-throated diver are breeding by the lake and herons and ospreys are feeding in the area.
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Little is known about the population of Gila chub in Mexico, but the populations that reside in Arizona are expected to decrease because of these ongoing threats: aquifer pumping, stream diversion, habitat alterations by non-native crayfishes, and mainly, predation/competition with nonnative fishes. Currently, the Gila chub are sharing the waters with green sunfish (Lepomis cyanellus) in many areas; however, introducing any other kind of exotic fish to the Gila chub must be managed and observed (it is crucial to their survival). In fact, the Gila chub has been extirpated on many occasions because of exotic fish such as the largemouth bass (Micropterus salmoides). According to the Arizona Fish and Game Department, the Bureau of Land Management Phoenix District is proposing translocations of the Gila chub from Silver Creek to an adjacent stream in the Agua Fria headwaters.
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