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The mouth may be on the forward end of the head (terminal), may be upturned (superior), or may be turned downwards or on the bottom of the fish (subterminal or inferior). The mouth may be modified into a suckermouth adapted for clinging onto objects in fast-moving water.
The white asterisk indicates the toothed pharyngeal jaw. Scale bar represents 500 μm. [1] Most bony fishes have two sets of jaws made mainly of bone. The primary oral jaws open and close the mouth, and a second set of pharyngeal jaws are positioned at the back of the throat.
Urechis unicinctus, known as the fat innkeeper worm or penis fish, is a species of marine spoon worm in East Asia. It is found in Bohai Gulf of China and off the Korean and Hokkaido coasts. [4] It is not to be confused with a closely related species, Urechis caupo , which occurs on the western coast of North America and shares common names. [5]
Perch is a common name for freshwater fish from the genus Perca, which belongs to the family Percidae of the large order Perciformes. The name comes from Greek: πέρκη, romanized : perke, meaning the type species of this genus, the European perch ( P. fluviatilis ). Many species of freshwater game fish more or less resemble perch, but ...
Pharyngeal jaw. The pharyngeal jaws of the moray eel. Oral and pharyngeal jaws of a cichlid. The photographs show a Malawi eyebiter ( Dimidiochromis compressiceps ). Pharyngeal jaws are a "second set" of jaws contained within an animal's throat, or pharynx, distinct from the primary or oral jaws.
In most cases, the diagnosis of mitral stenosis is most easily made by echocardiography, which shows left atrial enlargement, thick and calcified mitral valve with narrow and "fish-mouth"-shaped orifice and signs of right ventricular failure in advanced disease.
In fish anatomy and turtle anatomy, a barbel is a slender, whiskerlike sensory organ near the mouth. Fish that have barbels include the catfish , the carp , the goatfish , the hagfish , the sturgeon , the zebrafish , the black dragonfish and some species of shark such as the sawshark .
However, the external shape of heterocercal tail fins can also appear symmetric (e.g. †Birgeria, †Bobasatrania). Heterocercal is the opposite of hypocercal Hypocercal, also known as reversed heterocercal, means that the vertebrae extend into the lower lobe of the tail, making it longer than the upper lobe (as in the †Anaspida). It is the ...
Suckermouth. In fish, a suckermouth is a ventrally-oriented (inferior) mouth adapted for grazing on algae and small organisms that grow on submerged objects. All Loricariidae possess a suckermouth as do the cypriniform algae eaters of the genus Gyrinocheilus and other genera.
Fish scales are part of the fish's integumentary system, and are produced from the mesoderm layer of the dermis, which distinguishes them from reptile scales. The same genes involved in tooth and hair development in mammals are also involved in scale development.