Mackerel is a common name applied to a number of different species of pelagic fish, mostly from the family Scombridae. They are found in both temperate and tropical seas, mostly living along the coast or offshore in the oceanic environment.
Carcharhiniformes, the ground sharks, with over 270 species, are the largest order of sharks. They include a number of common types, such as catsharks, swellsharks, and the sandbar shark.
Nannostomus,, is a genus of fish belonging to the characin family Lebiasinidae. All of the species in this genus are known as pencil fish or pencilfish, a popular name that was first only applied to two species in the 1920s, Nannostomus unifasciatus and Nannostomus eques, but by the late 1950s would come to be applied to all members of the genus. Several of the species have become popular aquarium fish due to their attractive coloration, unique shape, and interesting demeanor.
The pencil fishes are a family (Lebiasinidae) of freshwater fishes found in Costa Rica, Panama, and South America. They are usually small and are known as ornamental fishes in aquaria, including popular fishes such as the various pencil fish and the splashing tetra.
Thunnus is a genus of ocean-dwelling, ray-finned bony fish from the mackerel family, Scombridae. More specifically, Thunnus is one of five genera which make up the tribe Thunnini – a tribe that is collectively known as the tunas. Also called the true tunas or real tunas, Thunnus consists of eight species of tuna, divided into two subgenera. The word Thunnus is the Middle Latin form of the Greek thýnnos – which is in turn derived from thynō. The first written use of the word was by Homer.
The Miller Lake lamprey is a species of lamprey in the Petromyzontidae family endemic to the United States. Its natural habitat is the Miller Lake drainage in the state of Oregon.
Nannostomus harrisoni,, is a species of pencil fish. Native to The Guianas, the species displays a single horizontal stripe of intense black, and blood red adornments on its fins. N. harrisoni is often confused with Nannostomus unifasciatus, another long, slender, single-striped species with similar profile and coloration, but N. harrisoni swims in a horizontal posture, as opposed to the snout-up oblique posture of N.unifasciatus, and the bright red adornments on the ventral fins of N. harrisoni are absent in N. unifasciatus. Though the recently described species N. grandis has been dubbed the largest member of the genus, adults of N. harrisoni commonly grow to a length of 70 mm, making it in fact the largest species of pencil fish described to date. It is commonly known as Harrison's pencilfish.
Fish are very diverse animals and can be categorised in many ways. This article is an overview of some of ways in which fish are categorised. Although most fish species have probably been discovered and described, about 250 new ones are still discovered every year. According to FishBase, 34,300 species of fish had been described as of September 2020. That is more than the combined total of all other vertebrate species: mammals, amphibians, reptiles and birds.
Several species of fish are claimed to produce hallucinogenic effects when consumed. For example, Sarpa salpa, a species of sea bream, is commonly claimed to be hallucinogenic. These widely distributed coastal fish are normally found in the Mediterranean and around Spain, and along the west and south coasts of Africa. Occasionally they are found in British waters. They may induce hallucinogenic effects similar to LSD if eaten. However, based on the reports of exposure they are more likely to resemble hallucinogenic effects of deliriants than the effects of serotonergic psychedelics such as LSD. In 2006, two men who apparently ate the fish experienced hallucinations lasting for several days. The likelihood of hallucinations depends on the season. Sarpa salpa is known as "the fish that makes dreams" in Arabic.
Nannostomus beckfordi,, commonly known as the golden pencil fish or Beckford's pencil fish, is a freshwater species of fish belonging to the characin family Lebiasinidae. It occurs widely and commonly in swamps and slow-moving waters in Brazil, Guyana, French Guiana, and Suriname.
Nannostomus bifasciatus,, is a freshwater species of fish belonging to the characin family Lebiasinidae. It is commonly known as the two-lined pencilfish. It can be found in slow-moving swamps and rivers in French Guiana and Suriname.
Nannostomus britskii, ,commonly known as the spotstripe pencilfish, is a freshwater species of fish belonging to the family Lebiasinidae of characins. They were first described in 1978 by Stanley H. Weitzman along with two other new species, from a collection of specimens preserved in the São Paulo museum. They have been recorded from only two localities, both in Brazil. No live specimens had been seen, collected, or exported for the aquarium trade until very recently.
Nannostomus digrammus,, commonly known as the twostripe pencilfish, is a freshwater species of fish belonging to the characin family Lebiasinidae. They were first described in 1913 by Henry Weed Fowler and are fairly typical of members of this genus being small, elongated fish with prominent horizontal stripes, in this case limited to two dominant stripes, usually maroon in color. They are recorded as native to Brazil and Guyana, where they occur fairly widely, but are seen only occasionally in the aquarium trade.
Nannostomus espei,, commonly known as Espe's pencilfish or barred pencilfish, is a freshwater species of fish belonging to the characin family Lebiasinidae. It was first described in 1956 by Herman Meinken from the Mazaruni River system in Guyana and to date this is its only known location. It is notable amongst the genus in that the dominant body pattern consists of five broad, comma-like patches instead of the more normal horizontal stripes seen in the rest of the genus. This pattern of patches is assumed by other species at night, but only N. espei displays the pattern permanently and in daylight.
Nannostomus limatus,, commonly known as the elegant pencilfish, is a freshwater species of fish belonging to the characin family Lebiasinidae. They were first described in 1978 by Stanley H. Weitzman along with two other new species, from a collection of specimens preserved in the São Paulo museum. Only rarely imported and kept by aquarists, they have been recorded from the Amazonian region of Brazil, specifically near Santarém.
The Badidae are a small family which has been placed in the order anabantiforme fishes. However, the 5th edition of Fishes of the World classifies the family as being a sister to the Anabantiformes, along with the Nandidae and Pristolepididae in an unnamed and unranked but monophyletic clade which is a sister to the Ovalentaria within the wider Percomorpha. Members of this family are small freshwater fish that are found in Bangladesh, Bhutan, China, India, Laos, Myanmar, Nepal, Pakistan and Thailand. The largest is Badis assamensis that reaches a standard length of up to 7.5 cm (3 in), while the smallest, Dario dario, does not exceed 2 cm (0.8 in).
Xenurobrycon polyancistrus is a species of characid fish of the subfamily Glandulocaudinae. A freshwater fish, it is the smallest species of characin in its family and order. Adults can grow up to 1.4 cm long.
