Operculum: A hard, bony plate which covers the gills.
Optimal Foraging Theory: A theory designed to predict the foraging behavior that maximizes food intake per unit time.
Operculum: A hard, bony plate which covers the gills.
Ozone: Ozone gas is a molecule which consists of three oxygen molecules. It is naturally occurring in the earth's atmosphere at all levels and is essential to reef keeping.
The operculum
This protects the branchiae and guarantees the circulation of water through the regular movements of the valve, ensuring that the branchiae are always in contact with the water from which they extract oxygen.
Operculum: The operculum is moderately thick and corneous. The structure is concentric with the nucleus near the center of the shell. The color of the operculum varies from light to dark brown.
· Preoperculum = the front bone of the gill cover
· Preopercular = located before the operculum, anterior gill cover (see relevant entry)
· Pro - = Gk prefix indicating "before" (equivalent to "Pre - ") as in prokaryotic.
Etymology: Operculum= Gill cover
Synonyms:Labrus opercularis, Macropodus viridi-auratus, Macropodus var. viridi auratus, Polyacanthus opercularis ...
Opercle (operculum)
the large posterior bone of the gill cover.
Origin (of fin)
the anterior end of a fin's base.
Rotpunkt has a very regular width along the flanks from just behind the operculum to the caudal peduncle spot, like in your photo. In A. macmasteri, the dark areas of the scales on the lateral band form a series of interconnected "v" shaped markings.
Corydoras panda has an off-white to pinkish-orange ground colour, and when observed under certain lighting conditions, a faint greenish iridescence is present upon the flanks and the operculum.
Betta climacura is close in appearance to a shortened Betta pugnax, the males showing the green iridescence on the operculum (gill covering). The male is generally a little smaller. The difference is the lateral bands exhibited by these fish.
Male bristlenoses are reputed to be aggressive towards one another, locking-out the spines at the base of the operculum (gill plate) and thorny pectoral fins to inflict serious wounds.
This is done by suspending breathing for a moment to allow a suction to form, then the intake is totally controlled by the modified gills pumped solely by the movement of the operculum.
Most "hard-tube" feather dusters belong to the family Serpulidae, and many members of this family have an operculum that is formed from a modified radiole in their crown.
The Squirrel fishes include about 40 species of fishes that all possess a large spine on their operculum (The plate that covers the gills), unlike their close cousins the Soldier fish which lack this spine.
Pectoral Fins - The paired pectoral fins are located on each side, usually just behind the operculum.
Pelvic Fins - Paired fins behind or below the pectoral fins
pH - Is the measurement of how acidic or how much alkaline is in your water.
The Arc Eye Hawkfish, also known as Arc-Eyed Hawkfish, has an orange colored body with a white horizontal bar on the back half. The operculum and eyes have the most distinctive markings, with an alternating blue and bright orange pattern.
The first ray of the pectoral fin is thicker in the male with odontodes (tiny spines) visible, these can also be observed just below the operculum (gill plate).
Breeding ...
The Halfmoon Triggerfish, also known as the White Tip Triggerfish, or Whitetail Triggerfish, has a brownish-black body with a blue underbelly. Yellow highlights the operculum and caudal fin (tail), which has a white tip.
Cana's generally mature at approximately fist-size in diameter and are characterized by a breathing siphon, 2 sets of tentacles (1 located by the mouth and one near the eyes) and an operculum (trapdoor).
 See also: Fish, Water, Species, Aquarium, Fry
  
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