Cod is the common name for the demersal fish genus Gadus, belonging to the family Gadidae. Cod is also used as part of the common name for a number of other fish species, and one species that belongs to genus Gadus is commonly not called cod.
Ophidiiformes is an order of ray-finned fish that includes the cusk-eels, pearlfishes, viviparous brotulas, and others. Members of this order have small heads and long slender bodies. They have either smooth scales or no scales, a long dorsal fin and an anal fin that typically runs into the caudal fin. They mostly come from the tropics and subtropics, and live in both freshwater and marine habitats, including abyssal depths. They have adopted a range of feeding methods and lifestyles, including parasitism. The majority are egg-laying, but some are viviparous.
The swamp eels are a family (Synbranchidae) of freshwater eel-like fishes of the tropics and subtropics. Most species are able to breathe air and typically live in marshes, ponds and damp places, sometimes burying themselves in the mud if the water source dries up. They have various adaptations to suit this lifestyle; they are long and slender, they lack pectoral and pelvic fins, and their dorsal and anal fins are vestigial, making them limbless vertebrates. They lack scales and a swimbladder, and their gills open on the throat in a slit or pore. Oxygen can be absorbed through the lining of the mouth and pharynx, which is rich in blood vessels and acts as a "lung".
Moray eels, or Muraenidae, are a family of eels whose members are found worldwide. There are approximately 200 species in 15 genera which are almost exclusively marine, but several species are regularly seen in brackish water, and a few are found in fresh water.
The superorder Elopomorpha contains a variety of types of fishes that range from typical silvery-colored species, such as the tarpons and ladyfishes of the Elopiformes and the bonefishes of the Albuliformes, to the long and slender, smooth-bodied eels of the Anguilliformes. The one characteristic uniting this group of fishes is they all have leptocephalus larvae, which are unique to the Elopomorpha. No other fishes have this type of larvae.
The deepwater arrowtooth eel, Histiobranchus bathybius, is a cutthroat eel of the genus Histiobranchus, found globally.
Bruun's cutthroat eel, Histiobranchus bruuni, is a cutthroat eel of the genus Histiobranchus, found around New Zealand at the bottom of the deep ocean basin at depths of between 4,000 and 5,000 m. Their length is between 40 and 60 cm.
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 but sometimes as deep as 4000 m. Depending on the species, adults may reach 1–2 m (39–79 in) in length, yet they weigh only 80-400 g. 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.
The wolffish, also known as sea wolves, are a family, Anarhichadidae, of perciform fish. There are three types of wolffish: the spotted Wolffish, the Atlantic Wolffish, and the Northern Atlantic Wolffish. They are native to cold waters of the northern Atlantic and Pacific oceans, where they live on the continental shelf and slope, to depths of about 600 metres. They are bottom-feeders, eating hard-shelled invertebrates such as clams, echinoderms, and crustaceans, which they crush with their strong canine and molar teeth. The longest species, Anarrhichthys ocellatus, grows to more than 2 m in length.
The bobtail snipe eels are two species of deep-sea eels in the family Cyematidae, one only in each of two genera. They are small elongate fishes, growing up to 16cm in length.
Ilyophis is a genus of eels in the cutthroat eel family Synaphobranchidae.
The Camallanida are an order of nematodes.
Neritidae, common name the nerites, is a taxonomic family of small to medium-sized saltwater and freshwater snails which have a gill and a distinctive operculum.
The Asian swamp eel, also known as rice eel, ricefield eel, or rice paddy eel is a commercially important, air-breathing species of fish in the family Synbranchidae. It occurs in East and Southeast Asia, where it is a very common foodstuff sold throughout the region. It has been introduced to two areas near the Everglades in Florida and near Atlanta in Georgia.
Eels are ray-finned fish belonging to the order Anguilliformes, which consists of eight suborders, 19 families, 111 genera, and about 800 species. Eels undergo considerable development from the early larval stage to the eventual adult stage, and most are predators.
Serrivomer is a genus of deep-sea eel in the family Serrivomeridae. It contains ten described species. Member species are distributed widely, being found in the Atlantic, Pacific and Indian Oceans. The smallest species in this genus is Serrivomer jesperseni, which has a maximum length of 40.6 cm; the largest species in this genus is Serrivomer beanii with a maximum length of 78 cm. Most members reach a maximum length of 60–70 cm,
Protanguilla palau is a species of eel, the only species in the genus Protanguilla, which is in turn the only genus in its family, Protanguillidae. Individuals were found swimming in March 2010 in a deep underwater cave in a fringing reef off the coast of Palau.
The Southern cut-throat eel is an eel in the family Synaphobranchidae. It was described by Regan in 1913. It is a marine, deep water-dwelling eel which is known from the southern Atlantic, Indian, and Pacific Ocean. It dwells at a depth range of 950 to 3,001 metres, and leads a benthic lifestyle. Males can reach a maximum total length of 62.8 centimetres (24.7 in), while females can reach a maximum TL of 67.0 centimetres (26.4 in).
Notograptus is a genus of marine fish in subclass Actinopterygii and order Perciformes. They are sometimes placed in a family of their own, Notograptidae, or may instead be included in the family Plesiopidae. Notograptus supposedly bears a relationship with Acanthoplesiops.
Rakthamichthys is a genus of swamp eels that are endemic to India. Three species are known from the Western Ghats and one is known from Northeast India.
