Of or relating to the cleithrum.

Variably-sized (depending on species), usually dark marking present in the cleithral area dorsal to the pectoral fin insertion. Normally visible externally in llive specimens.

Major bone of the pectoral girdle. Extends upward from the pectoral fin base and forms the rear margin of the branchial cavity. Articulates with the supracleithrum dorsally, the scapula and coracoid ventrally. Also known as proscapulum.

Common cavity into which the intestinal and urogenital tracts open in many fishes.

Specimen descended from and genetically identical to a single common ancestor with natural examples normally resulting from asexual reproductive events. Produced via parthenogenesis in some fishes.

Used in ichthyology to refer to the number of eggs deposited in a single spawning event, particularly when some form of nest is used.

Phylum of aquatic organisms that includes the corals, jellyfishes, sea anemones, hydrae, etc., and characterised by possession of specialised venomous cells known as cnidocytes. Formerly included in the now-defunct phylum Coelenterata.

Any member of the phylum Cnidaria.

Rough or harsh in texture.

Point or zone at which the land meets the sea or other large water body.

The shape or outline of a coast.

A rock fragment measuring 64-256 millimeters in diameter and usually rounded in shape due to natural causes such as weathering.

The main constituent protein of cartilage, connective tissue, tendon, skin, and bone.

Disease symptom resulting from infection by the bacterium Flavobacterium columnare which is ubiquitous in freshwater environments. Often mistaken for a fungal infection due to its appearance and is referred to variously as mouth rot, mouth fungus, fin rot, gill fungus, body fungus, saddleback columnaris, and cotton wool disease. Highly contagious and usually fatal unless treated […]

Of, relating to, characterised by or participating in a symbiotic relationship in which one species gains some benefit while the other is unaffected.

A symbiotic association between two organisms in which one gains some benefit while the other is unaffected.

Informal, vernacular name for a fish or other organism. Often varies by language, place or time.

A group of organisms or populations coexisting and interacting with one another in a given region under relatively similar environmental conditions. The different organisms influence each other's abundance, distribution, and evolutionary adaptation.

Any aquarium where the fish and other inhabitants are from varied geographic regions.

Simultaneous demand by two or more organisms for a limited resource such as food, light or living space.