Laurel dace | |
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Scientific classification | |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Actinopterygii |
Order: | Cypriniformes |
Family: | Cyprinidae |
Subfamily: | Leuciscinae |
Clade: | Laviniinae |
Genus: | Chrosomus |
Species: | C. saylori |
Binomial name | |
Chrosomus saylori (C. E. Skelton, 2001) | |
Synonyms | |
Phoxinus sayloriSkelton, 2001 |
The laurel dace (Chrosomus saylori) is a species of freshwater minnow native to the U.S. state of Tennessee. It was first discovered in 1976. [4] A very rare species, it has only been found in localized populations in six small streams on the Walden Ridge portion of the Cumberland Plateau in Tennessee. [5] It is found in six streams: the Soddy, Horn, Cupp, Young's, Moccasin, and Bumbee Creeks, all of which drain into larger rivers that eventually feed the Tennessee River. [3] It is believed to be extirpated from Laurel Creek, the only other stream where it was known to occur. [6]
It is commonly considered a nest associate and uses its large mouth and short intestinal tract to support an animal-based diet. Displaying sexual dimorphism, an average adult C. saylori measures approximately 45 mm at the age of reproduction. [6] Similar to other Chrosomus species, two dark parallel lines run the length of the body, and a red coloration appears during the breeding season. Spawning is believed to take place in small, cool streams, lined with small pebbles. [7]
As of August 9, 2011, this species was placed on the endangered species list, as a result of agriculture, mining, and timbering in the Walden Creek area. [2] [3] This fish is threatened by increased sedimentation in its habitat, which occurs because surrounding hillsides have been logged, leading to erosion. This accumulation of silt makes the fish's spawning areas unsuitable. Such activities can cause erosion, which increases siltation, impeding spawning efforts. Eggs can be suffocated by sediment settling into the rocky streambeds. [3] [6]
The fish is named for ichthyologist Charles F. Saylor, who was one of the first to collect it. Its common name refers to mountain laurel (Kalmia spp.), which is a common plant next to the streams where it lives. [6]
This minnow is 45.7 millimetres (1.80 in) long on average. It is olive green to tan in color with a silvery white underside. It has two black stripes on each side. During the breeding season the fish changes color, developing bright red coloration on the lower parts. Part of the dorsal fin becomes red, as do the lips. The stripes become a deeper black and there are more black areas on the head and breast. The cheeks and the area between the black stripes become gold. Most of the fins turn yellow. Females and males both change colors, but the male's colors are more intense. Otherwise, female and male can be told apart by the shape of the pectoral fins. [6]
Because C. saylori is a relatively recent discovery, a detailed life study has not been performed. However, it is known to take shelter in the riparian zones of creek, where vegetation provides shelter. Because of this, it is extremely susceptible to changes, or the absence of such stream-side plants. They are generally found in cool, slow moving water, or pools containing small rocks, boulders, and rubble. This type of streambed is easily influenced by an increase in siltation. C. saylori are also susceptible to warmer water temperatures, above 25 °C. [6] The localized populations may be the result of pockets of the preferred, cooler water surrounded by warmer water.
After analyzing the stomach contents, it was found that the diet of C. saylori is mostly animal material. It was mostly benthic insect larvae, as well as plant material and sand grains. Similar to other fish species with animal-based diets, they have large mouths, short intestines, a reduced number of pharyngeal teeth, and a primitively shaped basiocciptial bone. [8] C. saylori are often found feeding in loosely grouped schools. [6]
This species is characterized by two horizontal, uninterrupted black lines that run the length of the body which distinguish it from other similar species. Nuptial males have black pigment covering the breast and underside of head. [9] Their intestines are loosely coiled in an S-configuration, and have a winged basioccipital pharyngeal pad, as opposed to rounded. [6] Very little is known about the reproductive strategies of C. saylori because so little is known about the species in general. The species has been observed spending time around gravel beds with small pebbles, as well as spending time around gravel-bed nests made by other species. Yet, it is still unclear as to what actually happens, apart from spawning in gravel beds. [7] This trait alone, however, may be its downfall. Redds, or gravel-pebble spawning beds, are hugely impacted by any increase in siltation in the water. When the sediments sink and settle into these rocky areas, they can easily smother the eggs and ruin an entire breeding season. Therefore, this species is at a serious risk.[ citation needed ]
Because this species is so rare, only to be found in six streams, it has been listed as an endangered species. As of 2007, the species was listed as a candidate. As of September 8, 2011, this species was officially protected as an endangered species under the Endangered Species Act of 1973. [3] C. saylori is most threatened by an increase in siltation that can cause serious damage to spawning grounds. Such an increase can be caused by a variety of events, including the removal of riparian vegetation and timber removal progress in the nearby area surrounding these particular streams in which C. saylori can be found. In 1883, the Walden Ridge railroad moved into the area allowing for the transport of timber, which cause a boom in timber output. [10] However, trees that stand near streams are responsible for holding the rich soil in place, preventing it from being washed away and eroded by the stream. The removal of such trees through mining often results in stream bank erosion, causing an increase in siltation. In addition, nearby mining practices are known to have bad stream side management zones and problems with roadside construction. Two current projects are of greatest concern for this species including the installation of a water line crossing through a populated creek, and building an impoundment on a tributary to an occupied stream. [11] These activities result in great danger for the C. saylori species.
However, some efforts are being made to protect this fish. In 1992, an organization dedicated to aquatic conservation called Conservation Fisheries Inc. was established. It is responsible for monitoring and restoring at-risk populations such a C. saylori. They work throughout the southeast, using a variety of methods of management. Because the danger to this species is not yet dire, as they are still quite abundant in these areas, this organization is not currently taking action with C. saylori. They are able to raise them in hatcheries and are monitoring the populations, waiting for any indication of trouble. [11]
The snail darter is a small species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is found in East Tennessee freshwater in the United States. First recorded in 1973, the snail darter was listed as endangered under the U.S. Endangered Species Act of 1973 by 1975. The species was at the center of a major environmental law controversy that involved a lawsuit seeking to halt the completion of Tellico Dam, which posed a risk of extinction for the snail darter by blocking its migratory route. The case was eventually appealed to the U.S. Supreme Court, which ruled on it in its 1978 decision Tennessee Valley Authority v. Hill.
The northern redbelly dace is a fresh water cyprinid fish, generally found in lakes and small streams in the northeastern United States and eastern Canada. Ranging from 1-3 inches, it is one of forty-four species from the minnow and carp family of Cyprinidae in these areas.
The northern hogsucker is a freshwater ray-finned fish belonging to the family Catostomidae, the suckers. It is native to the United States and Canada where it is found in streams and rivers. It prefers clear, fast-flowing water, where it can forage on the riverbed for crustaceans, mollusks, aquatic insects, algae and detritus. It turns over small pebbles and scrapes materials off rocks and sucks up the particles, and other species of fish sometimes station themselves downstream from its activities so as to garner disturbed food fragments. Breeding takes place on gravel bottoms in shallow riffles in late spring. This fish is susceptible to such man-made disturbances as channelization, sedimentation, pollution, and dam construction. However, it has a wide range and is a common species so the International Union for Conservation of Nature has rated its conservation status as being of "least concern".
The southern redbelly dace, is a North American species of temperate freshwater fish of the family Cyprinidae. The natural geographic range extends from Western New York to Minnesota, and south to Oklahoma, Arkansas, and Alabama. This fish prefers flowing pools of creeks and streams.
The blackside dace is a species of ray-finned fish in the family Cyprinidae. It is endemic to the Cumberland River drainage in Kentucky and Tennessee as well as the Powell River drainage in Virginia in the United States. It is a federally listed threatened species.
The Tennessee dace is a species of ray-finned fish in the family Cyprinidae. It is found only in the United States; particularly in northeast Tennessee and southwest Virginia, and parts of extreme northwest Georgia. Until recently, they were considered a subspecies of mountain redbelly dace. They are commonly found in East Tennessee in spring fed first-order streams, often in silt and fine gravel pools, or undercut banks. These streams usually do not exceed two meters in width.
The redband darter is a species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is endemic to the state of Tennessee in the eastern United States.
Semotilus atromaculatus, known as the creek chub or the common creek chub, is a small minnow, a freshwater fish found in the eastern US and Canada. Differing in size and color depending on origin of development, the creek chub can usually be defined by a dark brown body with a black lateral line spanning horizontally across the body. It lives primarily within streams and rivers. Creek chubs attain lengths of 2-6 inches with larger specimens of up to 12 inches possible. The genus name Semotilus derives from the Greek word sema, and atromaculatus comes from the Latin word "black spots".
The popeye shiner is a North American species of freshwater cyprinid fish.
The finescale dace is a species of freshwater fish in the family Cyprinidae of order Cypriniformes. It is native to the northern portions of Minnesota, with relatively smaller populations in northern New York, Vermont, New Hampshire, and Maine.
The scarlet shiner is a freshwater fish native to the eastern United States.
The redtail chub is a freshwater fish found in the U.S. states of Tennessee and Kentucky.
The river chub is a minnow in the family Cyprinidae. It is one of the most common fishes in North American streams.
The creek chubsucker is a freshwater fish of the sucker family (Catostomidae).
The southern studfish is a ray-finned fish of the family Fundulidae, the tooth carps, that is native to the southeastern United States.
The Cumberland snubnose darter is a species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. This species is found in the middle Cumberland River drainage in Tennessee, Kentucky, Virginia, North Carolina, Georgia, and Alabama. It is absent in reaches above the Big South Fork, rare in North Carolina, and absent in western tributaries of the Tennessee River. While research on the ecology of E. atripinne is not extensive, what is known is they are usually found in small to medium freshwater streams in gravel riffle areas where their eggs can attach to the substrate and be left unguarded. E. atripinne can be found within a wide range of depths in its environment, leading its being classified as benthopelagic. While its global status is secure, the American Fisheries Society labels it with a status of “Special Concern”.
The bluebreast darter is a small species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is endemic to the eastern United States from New York and Illinois to Tennessee and North Carolina.
The goldstripe darter is a species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is endemic to the southeastern United States where it is found in Gulf Slope streams from the Colorado River drainage in Texas to the Flint River in Georgia, the Atlantic Slope in Ocmulgee River system, Georgia, and the Mississippi embayment north as far as southeastern Missouri and western Kentucky. It is typically found in small springs, streams, and creeks with aquatic and marginal vegetation and detritus. The female spawns on multiple occasions between about mid-March and June, sticking the adhesive eggs to plants, gravel and the sides of rocks. The goldstripe darter is a common species with a wide range and numerous sub-populations, and the International Union for Conservation of Nature has assessed its conservation status as being of "least concern".
The olive darter is a species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is native to Tennessee, Kentucky, North Carolina, and Georgia, in the United States. It is found in the headwaters of Tennessee River system and the middle reaches of the Cumberland River system, its ideal habitat being clear, cold water over rocky substrates. It grows to a length of about 5 in (13 cm) and is an insectivore, feeding mainly on insect larvae on the riverbed. The fish matures at age two and lives till about age four. Up to 1500 eggs are spawned which fall to the riverbed and get lodged among gravel. The olive darter is classified as a "vulnerable species", being affected by habitat destruction and siltation, often resulting from damming and impoundment of the rivers or the creation of weirs. It is also affected by the change in the forest riparian habitat resulting from the killing of trees by the hemlock woolly adelgid.
Chrosomus is a genus of small cyprinid fish found in freshwater habitats in the eastern half of the United States and Canada. There are currently seven recognized species in this genus. They have sometimes been included in Phoxinus. They are the only members of the predominantly western subfamily Laviniinae that are found in eastern North America.