| Dark stonebasher | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Osteoglossiformes |
| Family: | Mormyridae |
| Genus: | Pollimyrus |
| Species: | P. nigricans |
| Binomial name | |
| Pollimyrus nigricans (Boulenger, 1906) | |
The dark stonebasher (Pollimyrus nigricans) is a species of ray-finned fish in the family Mormyridae.
It is found in Burundi, Kenya, Tanzania, and Uganda. In Africa, they can be found at Lake Victoria, Nabugabo and Kyoga; the Kiruni River (Semliki Valley), Malagarasi River and Tanganyika Lake. [1]
Its natural habitats are rivers, swamps, freshwater lakes, freshwater marshes, and inland deltas. It can be found in tropical climates. They are also known to swim up the river to spawn. The Dark stonebasher also prefers the shallow muddy bottom of waters near vegetation. [1]
The dark stonebasher mainly feeds on Caridina and caenid larvae. [1]
It is threatened by habitat loss.
The smallmouth bass is a species of freshwater fish in the sunfish family (Centrarchidae) of the order Perciformes. It is the type species of its genus. One of the black basses, it is a popular game fish sought by anglers throughout the temperate zones of North America, and has been spread by stocking—as well as illegal introductions—to many cool-water tributaries and lakes in Canada and more so introduced in the United States. The maximum recorded size is approximately 27 inches and 12 pounds. The smallmouth bass is native to the upper and middle Mississippi River basin, the Saint Lawrence River–Great Lakes system, and up into the Hudson Bay basin. The world record size was 11 lbs and 15 ounces caught in the reservoir Dale Hollow, on the Kentucky—Tennessee border. Its common names include smallmouth, bronzeback, brown bass, brownie, smallie, bronze bass, and bareback bass.
Steelhead Trout is a name given to the anadromous form of the coastal rainbow trout (Oncorhynchus. m. irideus) or redband trout (O. m. gairdneri). The steelhead are native to freshwater and ocean environments across North America, but have been introduced to every other continent except Antarctica. Steelhead use aquatic obstructions like vegetation, boulders, and fallen trees as protection. Steelhead migrate to spawn during the summer months and the winter months.
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The tench or doctor fish is a fresh- and brackish-water fish of the order Cypriniformes found throughout Eurasia from Western Europe including the British Isles east into Asia as far as the Ob and Yenisei Rivers. It is also found in Lake Baikal. It normally inhabits slow-moving freshwater habitats, particularly lakes and lowland rivers.
The Mary River cod is a species of temperate perch native to the coastal Mary River system of southern Queensland, Australia. Mary River cod are one of Australia's most endangered freshwater fishes and are notable for being the most northerly of the four Maccullochella cods found or once found in coastal river systems of eastern Australia.
The black softshell turtle or Bostami turtle, previously placed in genus Aspideretes, is a species of freshwater turtle found in India (Assam) and Bangladesh. It was long believed to be inbred individuals of the Indian softshell turtle or the Indian peacock softshell turtle, but while it is a close relative of the latter, it is a distinct species. In the 1800s it was believed these turtles were brought from Iran to Chittagong shrine pond by Hazrat Bayezid Bostami. His turtles he had brought to this pond were treated as sacred and respected by the public. Previously declared extinct by the International Union for Conservation of Nature in 2002, these turtles were found still to exist in a temple's pond called the Hayagriva Madhava Temple located in Assam, India. Through conservation methods and protection of the species, some of these turtles can be found today throughout the wild, and scientists and environmental biologists are continuing to work hard to preserve this endangered species and their natural habitat.
The Madagascan grebe is a grebe found only in western and central Madagascar. The binomial name commemorates the Austrian ornithologist August von Pelzeln. It is classified as vulnerable by the IUCN, with a population of less than 5,000. It is threatened by habitat loss, predation by carnivorous fish, and competition with introduced species.
The lake chub is a freshwater cyprinid fish found in Canada and in parts of the United States. Of all North American minnows, it is the one with the northernmost distribution. Its genus, Couesius is considered monotypic today. The genus was named after Dr. Elliott Coues, who collected the holotype specimen.
The southern river otter is a species of otter that lives in Chile and Argentina. Although called a "river otter", it inhabits both marine and freshwater environments. It sometimes is considered a subspecies of Lontra canadensis. The southern river otter is listed as endangered, due to illegal hunting, water pollution, and habitat loss.
Freshwater fish are those that spend some or all of their lives in fresh water, such as rivers and lakes, with a salinity of less than 1.05%. These environments differ from marine conditions in many ways, the most obvious being the difference in levels of salinity. To survive fresh water, the fish need a range of physiological adaptations.
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 lake salmon or mpasa is an African species of freshwater fish, endemic to Lake Malawi, in the family Cyprinidae found in Malawi, Mozambique, and Tanzania. Its natural habitats are rivers and freshwater lakes.
The longnose stonebasher is a species of fish in the family Mormyridae. It is found in Burundi, the Democratic Republic of the Congo, Kenya, and Tanzania. Its natural habitats are rivers, freshwater lakes, freshwater marshes, and inland deltas.
Graham's stonebasher is a species of ray-finned fish in the family Mormyridae. It is found in Kenya, Rwanda, Tanzania, and Uganda. Its natural habitats are rivers, swamps, freshwater lakes, freshwater marshes, and inland deltas. It is threatened by habitat loss.
The Victoria stonebasher is a species of ray-finned fish in the family Mormyridae. It is found in Kenya, Rwanda, Tanzania, and Uganda. Its natural habitats are rivers, swamps, freshwater lakes, freshwater marshes, and inland deltas. It is threatened by habitat loss.
Pollimyrus is a genus of elephantfishes native to Africa.
The vundu is a species of large airbreathing catfish found widely in rivers and other freshwater habitats of sub-Saharan Africa, as well as the Nile. It is also called the solomon fish, tsuni, mazunda, sampa, cur, lenda, or certa.
The Allegheny pearl dace is a species of cyprinid fish. It is demersal, freshwater fish, with a dark green back and silvery body. This species is omnivorous, consuming algae, as well as arthropods. M. margarita's range spans southern Canada and the northern United States. While not considered endangered at the federal level in the United States, several states either consider this species endangered or threatened; it faces threats of habitat destruction and invasive species.
The bluntnose minnow is a species of temperate freshwater fish belonging to the genus Pimephales of the cyprinid family. Its natural geographic range extends from the Great Lakes south along the Mississippi River basin to Louisiana, and east across the Midwestern United States to New York State. The bluntnose is very ubiquitous, and may be the most common freshwater fish in the Eastern U.S.
The Halloween darter is a small freshwater fish native to North America. It is found in Georgia and Alabama in the drainage basin of the Apalachicola River, specifically in the Flint River system and the Chattahoochee River system. It prefers shallow, fast-flowing areas with gravel bottoms in small and medium-sized rivers. It was first described in 2008, having not previously been distinguished from the blackbanded darter (P. nigrofasciata), which occurs in the same watershed. The color is somewhat variable, being generally blackish dorsally, with some individuals having indistinct saddle-like barring. Males have orange and dark lateral striping while females have dark stripes and a yellowish-green belly. At a maximum standard length of 101 mm (4 in), males are slightly larger than females, and both sexes develop distinctive orange barring on the edge of the first dorsal fin during the breeding season.
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