Eastern blacknose dace | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Actinopterygii |
Order: | Cypriniformes |
Family: | Cyprinidae |
Subfamily: | Leuciscinae |
Clade: | Pogonichthyinae |
Genus: | Rhinichthys |
Species: | R. atratulus |
Binomial name | |
Rhinichthys atratulus | |
Synonyms | |
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Eastern blacknose dace (Rhinichthys atratulus) is a species of ray-finned fish in the genus Rhinichthys . Its name originates from the Old French word "dars" which is the nominative form of the word "dart" in reference to their swimming pattern. The western blacknose dace (Rhinichthys obtusus) formerly was considered conspecific. While morphologically the two species are not significantly different, they are allopatric. [3] The eastern blacknose dace is found across the southeast portion of Canada and down along the United States' east coast. It is dark brown to olive on its dorsal surface and silvery white below, the two shades separated by the darkly pigmented lateral line. In the breeding season, males develop darker pigmentation and an orange lateral line. Blacknose dace live in rocky streams and rivers where they feed upon small invertebrates and microscopic biological matter and provide forage for larger fish.
As fry, this fish is 5 mm (3⁄16 in) long, and some of the larger eastern blacknose dace can reach slightly over 100 mm (3.9 in). They tend to live for two or three years and grow continuously during this period. [4] They have a fusiform body shape and the mouth is in a subterminal position. The lateral line is darkly colored and has 56 to 70 scales from anterior to posterior. Above the lateral line coloration can vary between shades of dark brown and even olive, while below the lateral line coloration is lighter up until a white belly. Their caudal fin is forked, and their single dorsal fin has 8 fin rays and no spines. [5] They have a pair of pectoral fins and a pair of abdominal ventral fins, as well as an anal fin with 7 rays. [2] All fins are clear to yellow except males during spawning season acquire an orange to red tint in all fins and along the lateral line. [5]
This fish is mainly found along the southern border of Canada extending along from Manitoba to the Atlantic Ocean, south along the east coast of the United States and slightly inland to South Carolina and Georgia. [6] [7] Scientists hypothesize that 20,000 years ago, as the glaciers retreated, blacknose dace recolonized the region from a single refugium in modern-day Connecticut, as soon as 75 years after the ice receded. [8]
This fish tends to inhabit headwaters, creeks, and small rivers with swiftly moving water. However, fry mature in slower moving portions of the habitats like shoals and pool margins. [2] The species as a whole prefers cool, rocky areas and uses the stones to rest under and around. They also use overhanging vegetation and undercut banks for additional refuge. [4] In the winter, they migrate from headwater streams into rivers and can be found in deeper water under banks. [6]
The eastern blacknose dace eats many small insects and other invertebrates including Acentria ephemerella , Telmatogetoninae, other Chironomidae, worms, algae, and small crustaceans such as young crayfish. They also feed on some plant species. [9] [5] [10] Young fry forage in shallow silty water while adults move into riffles and deep eddying pools to find invertebrates. [4]
Many larger fish feed on the eastern blacknose dace including smallmouth bass, brook trout, brown trout, and rainbow trout. [5] They are also preyed upon by the common merganser and the blue heron. [5] [9]
Eastern blacknose dace spawning takes place between May and June and occurs in shallow water over gravel riffles. [5] During this breeding season, the male develops nuptial tubercles on various parts of the body including the head and fins. His coloration also turns orange-red during this time along the lateral stripe and pectoral fins. [5] Males of this species are nonterritorial and mate with one female. Eggs are deposited into crude nests which are depressions in the gravel created by vigorous movement during spawning. Larger females have higher fecundity and lay between 400 and 1,100 eggs. Following egg deposition, there is little to no parental care for the young. [10] [4]
The loach minnow is a species of freshwater fish. It is a member of the carp family of order Cypriniformes. It occurs in streams and small rivers throughout the Gila River and San Pedro River systems in Arizona, New Mexico, and Sonora; it is now considered extinct in Mexico.
Rhinichthys, known as the riffle daces, is a genus of freshwater fish in the carp family (Cyprinidae) of the order Cypriniformes. The type species is Rhinichthys atratulus, the blacknose dace. Rhinichthys species range throughout North America.
The slimy sculpin is a freshwater species of fish belonging to the family Cottidae, which is the largest sculpin family. They usually inhabit cold rocky streams or lakes across North America, ranging from the Great Lakes, southeast Minnesota, northeast Iowa, southwest Wisconsin and northeast Canada. Slimy sculpins have also been found roaming the cold streams of eastern Siberia. They are commonly confused with their closely related relatives, Mottled sculpin, and with tubenose gobies who are both freshwater fishes as well. The slimy sculpin is a nocturnal fish that usually spends most of its time on the stream bottom and seeks shelter under rocks and logs, especially during spawning season. When it swims, it sometimes appears to be "hopping" along the bottom because of its inefficient ability to swim. This is partly due to the absence of a swim bladder, which normally gives buoyancy to a fish.
The longnose dace is a freshwater minnow native to North America. Rhinicthys means snout fish and cataractae means of the cataract. Longnose dace are small, typically less than 100 mm and characterized by their fleshy snout that protrudes past the mouth. They are well adapted for living on the bottom of fast-flowing streams among stones. Longnose dace eat algae and aquatic insects and are important forage minnows for larger predatory fish.
Eldon's galaxias is an endangered galaxiid fish endemic to New Zealand. One of several fishes in the genus Galaxias found in Central Otago, it has a very small home range and is at risk of being driven to extinction by trout introduced for recreational fishing.
The rosyface shiner is a small fresh water fish of the minnow and carp family (Cyprinidae). It is native to eastern North America.
The beautiful shiner is a species of ray-finned fish in the family Cyprinidae. It is found in Mexico and Arizona and New Mexico in the United States. It is one of 22 species of Cyprinella found in North America.
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.
Western blacknose dace is a common species of ray-finned fish belonging to the family Cyprinidae and the genus Rhinichthys. Western blacknose dace have tan to dark brown backs, lighter sides, and cream colored undersides. Dark blotches are sporadically scattered across their sides and backs. A distinctive dark colored mid-lateral stripe from the tip of the snout to the caudal peduncle is present. The snout is relatively long and they have a slightly sub-terminal mouth. The stripe is dark brown in females and is a rusty pink color in males during spawning season. The lateral stripe is more pronounced and the caudal spot is present in juveniles. Similar to other species of dace the western blacknose dace give the illusion of having no scales but in actuality the scales are so small they are hard to see. Western blacknose dace are typically 2-3 inches long but can grow to as long as 4 inches. They have a forked tail, single dorsal fin with 8 rays and no spines, a pelvic fin on the abdominal, no adipose fin, and an anal fin with 7 rays and no spines.
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 river chub is a minnow in the family Cyprinidae. It is one of the most common fishes in North American streams.
Percina phoxocephala, the slenderhead 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 found in North America in the central Ohio and Mississippi River basins, to northeastern South Dakota and the Lake Winnebago system in Wisconsin, and as far south as the Red River in eastern Oklahoma and northeast Texas, typically in small to medium size rivers. It is a colorful species, with an average length of 6 to 9 centimeters. Males take on a deeper hue during the breeding season. It feeds on insect larvae and other small invertebrates, and spawns between April and June. It is a common fish with a very wide range and the International Union for Conservation of Nature has classified its conservation status as being of "least concern".
Etheostoma variatum, the variegate 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 the eastern United States where it occurs primarily in the Ohio River basin; it is present in the states of Ohio, New York, Pennsylvania, Indiana, West Virginia and Kentucky with a small population in Virginia. It is a large darter, growing to 10 cm (4 in) long, orange-red with black vertical barring on its body, and horizontal barring on its front dorsal fin. Its typical habitat is swift-flowing riffles with rubble, boulder and gravel. No major threats have been identified for this fish and the International Union for Conservation of Nature has assessed its conservation status as being of "least concern".
The lipstick 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 eastern United States, where it occurs in the Tallapoosa River drainage above the Fall Line in Alabama and Georgia. It inhabits rocky riffles of creeks and small to medium rivers.
The blacknose dace is either of two ray-finned fish species:
The inland riffle sculpin is a species of fish in the family Cottidae. It is found in the United States, inhabiting the lower Columbia River drainage in Washington, to Morro Bay in California. It is also found in the Puget Sound drainage in Washington. It reaches a maximum length of 11.0 cm. It prefers rocky riffles of headwaters and creeks.
The slim minnow is a species of freshwater ray-finned fish from the family Cyprinidae, the carps and minnows which is endemic to the United States, in Ozarks of Arkansas, Kansas, Missouri, and Oklahoma.