Herring are forage fish, mostly belonging to the family of Clupeidae.
The Cuban gambusia is a species of freshwater fish. It is a member of the family Poeciliidae of order Cyprinodontiformes, and is the type species of its genus. It is native to Cuba, inhabiting primarily stagnant lakes or ponds and slow-moving streams. A carnivorous surface feeder, it occurs in shoals near the shoreline.
Paracheirodon is a genus of freshwater fish in the family Characidae of the order Characiformes. The type species is P. innesi, the well-known neon tetra, and the Paracheirodon species are among the fishes known as tetras. All species of this genus are native to the Neotropical realm, occurring in the Orinoco and Amazon Basins in northern South America.
Shrimpfish, also called razorfish, are five small species of marine fishes in the subfamily Centriscinae of the family Centriscidae. The species in the genera Aeoliscus and Centriscus are found in relatively shallow tropical parts of the Indo-Pacific, while the banded bellowsfish, which often is placed in the subfamily Macroramphosinae instead, is restricted to deeper southern oceans.
Cynodontidae, also known as dogtooth characins or vampire tetras, are a family of predatory, characiform freshwater fishes from South America. This group is not very diverse, and includes only five genera and 14 species. Most of what is known about this family is from the members of the subfamily Cynodontinae, which includes the largest species of this family, up to 117 cm (3.84 ft). The members of subfamily Roestinae only reach up to 20 cm (7.9 in). and are less known.
Snipe eels are a family, Nemichthyidae, of eels that consists of nine species in three genera. They are pelagic fishes, found in every ocean, mostly at depths of 300–600 m (980–1,970 ft) but sometimes as deep as 4,000 m (13,000 ft). Depending on the species, adults may reach 1–2 m (39–79 in) in length, yet they weigh only 80–400 g (2.8–14.1 oz). They are distinguished by their very slender jaws that separate toward the tips as the upper jaw curves upward. The jaws appear similar to the beak of the bird called the snipe. Snipe eels are oviparous, and the juveniles, called Leptocephali, do not resemble the adults but have oval, leaf-shaped and transparent bodies. Different species of snipe eel have different shapes, sizes and colors. The similarly named bobtail snipe eel is actually in a different family and represented by two species, the black Cyema atrum and the bright red Neocyema erythrosoma.
Glass knifefishes are fishes in the family Sternopygidae in the order Gymnotiformes. Species are also known as rattail knifefishes.
Neolamprologus multifasciatus is one of the small shell-dwelling cichlids endemic to Lake Tanganyika. The male reaches 5 cm (2 in) in length, and the female only 2.5 cm (1 in) in the aquarium. In the wild, they reach only 3 centimetres (1.2 in) in standard length of male and female reaches less than 2.2 centimetres (0.87 in) in standard length. This makes them one of the smallest cichlid species in the world. Its natural habitat is the Neothauma shell beds of Lake Tanganyika, where it forms huge colonies with thousands of individuals. Their unique behavior is associated with their affinity to shells. They burrow sand to move shells, take refuge in shells and also breed in them. They have pale white coloring with black vertical bars running the length of their bodies. The species is sexually monomorphic, meaning sexing individuals is extremely hard or impossible based on external appearance alone.
Batasio is a genus of catfish of the family Bagridae. These small fish are found in fast-flowing hillstreams throughout South and mainland Southeast Asia.
Scleronema is a genus of pencil catfishes native to South America. They are a member of the subfamily Trichomycterinae. Species of Scleronema are geographically distributed in the La Plata basin and Atlantic coastal drainages from Southern Brazil, Southern Paraguay, Northeastern Argentina and Uruguay. They inhabit rivers or streams with sand or gravel-bottoms across the Pampa grasslands. In Greek, Scleronema means "hard filament."
Plotosus is a genus of eeltail catfishes native to the Indian Ocean, the western Pacific Ocean and New Guinea.
The banded lampeye is a species of poeciliid that is native to Africa, ranging from Senegal to Angola. It is mainly found in coastal brackish habitats such as river mouths, lagoons and mangrove swamps. It reaches up to 7 cm (2.8 in) in total length.
Tropheus polli is a species of cichlid endemic to Lake Tanganyika, where it is only known from the central eastern portion of the coast in areas with rocky substrates. This species can reach a total length of 16.5 cm (6.5 in). It can also be found in the aquarium trade. The specific name honours the ichthyologist Max Poll. It is considered by some authorities to be a synonym of Tropheus annectens.
Platax is a genus of Indo-Pacific, reef-associated fish belonging to the family Ephippidae. There are currently five known extant species generally accepted to belong to the genus. They are one of the fish taxa commonly known as "batfish".
Ichthyoelephas is a genus of South American freshwater fish from the family Prochilodontidae.
Priapichthys is a genus of poeciliid fishes native to Costa Rica, Panama and Colombia.
Belonion dibranchodon is one of two needlefish, in the genus Belonion, which is in the family Belonidae in the order Beloniformes. They are native to South America within the Atabapo and Negro River basins, and can be found in freshwater environments within a benthopelagic range in a tropical climate. B. dibranchodon can reach about 4.8 cm (1.8 in) in length. This species is recorded to be oviparous; they produce their young by means of eggs. The eggs can be found on objects in the water attached by tendrils on the surface of the egg.
The Badidae are a small family which has been placed in the order Anabantiformes. 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).
Priapichthys caliensis is a species of freshwater fish. It is a member of the family Poeciliidae of order Cyprinodontiformes. It is endemic to Colombia and primarily inhabiting brooks and streams with currents of low to high velocity. A carnivorous surface feeder, it occurs in shoals near the shoreline.
