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Opercular series in bony fish: operculum (yellow), preoperculum (red), interoperculum (green) and suboperculum (pink) The operculum is a series of bones found in bony fish and chimaeras that serves as a facial support structure and a protective covering for the gills ; it is also used for respiration and feeding.
Fish anatomy is the study of the form or morphology of fish. It can be contrasted with fish physiology , which is the study of how the component parts of fish function together in the living fish. [ 1 ]
Turbinidae have a strong, thick calcareous operculum readily distinguishing them from the somewhat similar Trochidae or top snails, which have a corneous operculum. This strong operculum serves as a passive defensive structure against predators that try to enter by way of the aperture or that would break the shell at the outer lip.
The operculum lies on the top rear part of the foot. When the foot is retracted, the operculum is rotated 180° and closes the shell. [2] An operculum (fish), a flap that covers the gills in bony fishes and chimaeras. The cover that rapidly opens a cnida of a cnidarian such as a jellyfish or a sea anemone. The lid may be a single hinged flap or ...
The large bone which forms the upper posterior part of the operculum. operculum The bony flap that covers the gills. opercular Pertaining to the operculum. opercular spine A spine projecting from the operculum. orbit The eye socket. origin The most anterior point of a fin base. osseous Bony. ovate Egg-shaped.
The preoperculum has a sizeable spine at its corner and a serrated rear margin while there are 4 spines between the preoperculum and the operculum. [3] The juveniles are a dark bluish-grey on their bodies, which is marked with a number of vertical blue bars, 2 on the head and 5 on the flanks, these fade as they mature into adults. [ 4 ]
The gill arches of bony fish typically have no septum, so that the gills alone project from the arch, supported by individual gill rays. Some species retain gill rakers. Though all but the most primitive bony fish lack a spiracle, the pseudobranch associated with it often remains, being located at the base of the operculum. This is, however ...
The blob fish (Psychrolutes phrictus) is a species of deep-sea fish of the family Psychrolutidae. It feeds mainly on crustaceans, molluscs, and sea pens. It lives off the continental shelves in very deep water (839–2800 m) in the North Pacific Ocean by the coasts of Japan, the Bering Sea, and California. When the female lays eggs the adult ...