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Ilyophinae, the arrowtooth ells or mustard eels, is a subfamily of marine ray-finned fishes belongiing to the family Synaphobranchidae, the cutthroat eels. Within its family this subfamily shows greatest number of species and the greatest morphological diversity.
The silver lamprey is an eel-like fish with an attenuate body composed of 49–52 clearly defined segments (i.e. myomeres, between the last gill slit and the anus).Silver lampreys possess a cartilaginous skeleton, and adults generally grow to a length of 12 inches and are silvery or bluish in color when spawning.
Blenniformids are generally small fish, only occasionally reaching lengths up to 55 cm, with elongated bodies (some almost eel-like), and relatively large eyes and mouths. Their dorsal fins are often continuous and long; the pelvic fins typically have a single embedded spine and are short and slender, situated before the pectoral fins.
Common names of fish can refer to a single species; to an entire group of species, such as a genus or family; or to multiple unrelated species or groups.Ambiguous common names are accompanied by their possible meanings.
The blennioid family Chaenopsidae includes the pike-blennies, tube-blennies, and flagblennies, all percomorph marine fish in the order Blenniiformes. [2] The family is strictly tropical, ranging from North to South America. Members are also present in waters off Japan, Taiwan and Korea.
Requires a minimum 8,750 gallon aquarium. Like most butterfly rays, it usually does not do well in aquarium confines as it is often hard to feed (thus force feeding shows promise with this species). Also like most butterfly rays, it is an active ray that requires much swimming space like some active sharks. It is rarely available. [70]
The Anguillidae are a family of ray-finned fish that contains the freshwater eels.They are the only modern taxon of the infraorder Anguillales.All the extant species and six subspecies in this family are in the genus Anguilla, and are elongated fish of snake-like bodies, with long dorsal, caudal and anal fins forming a continuous fringe.
Some marine fish, like sharks, have adopted a different, efficient mechanism to conserve water, i.e., osmoregulation. They retain urea in their blood in relatively higher concentration. Urea is damaging to living tissue so, to cope with this problem, some fish retain trimethylamine oxide. This provides a better solution to urea's toxicity.