Results for “várzea”

centrum

The solid central part of a vertebra, not including the bases of the neural arch.

chemical filtration

Water filtration method by which dissolved chemicals are removed via use of synthetic adsorbents, ion exchangers, insoluble oxides, zeolite, or activated carbon, these usually being placed within the filter unit or sump.

chloramine

Any of various compounds containing nitrogen and chlorine, some of which are used as bactericides. Chloramines are often used to purify drinking water because they're more stable than chlorine and produce fewer harmful by-products, but they're considered harmful to fishes.

clavicle

Refers to the collar bone in human anatomy. Present in the pectoral girdle of some fishes as a paired, dermal bone ventral to or fused with the cleithrum.

Used in 1 profile

cleithrum

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.

Used in 4 profiles

clone

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.

Cnidaria

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.

columnaris

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 with antibiotics or other.

Used in 1 profile

community aquarium

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

Used in 244 profiles

conserved name

A scientific name that has specific nomenclatural protection under the ICZN code, specifically a name that is otherwise unavailable or invalid but has been made available as a valid name by removal of the obstacles blocking its use.

coral sand

Sand originating from marine environments via bioerosion of the calcareous skeletal structures possessed by some organisms. Coral is not the chief constituent, however, with the majority of material deriving from foraminifera, calcareous algae, molluscs, and crustaceans.

Used in 6 profiles

costiasis

Disease of freshwater fishes caused by species of parasitic flagellate protozoa from the genus Ichthyobodo and more accurately referred to as ichthyobodiosis. It attacks the gills, fins and skin with symptoms including an increase body mucus secretion giving rise to the vernacular term 'skin slime disease'. Can be treated using proprietary products but frequently fatal otherwise.

cotype

Term formerly used in zoological taxonomy and equivalent to the modern terms syntype and paratype but no longer valid according to the ICZN code.

countershading

Form of camouflage in which an organism possesses darker pigmentation on the parts of the body exposed to light and paler on those normally shaded. Many fishes are coloured darker dorsally and lighter ventrally for this purpose.

Used in 4 profiles

courtship ritual

Complex, genetically-determined sequence of behaviour, usually employing a combination of visual, auditory and chemical stimuli taking place before spawning. Either or both sexes may be the protagonist.

Used in 2 profiles

crater lake

Type of lake formed by accummulation of water in a volvanic crater or caldera.

Used in 7 profiles

crossbreed

An organism with parents of two different breeds, races, varieties, or species; the process involved in producing such an organism.

Used in 2 profiles

cyanobacteria

Phylum of generally blue-green coloured bacteria, often confused with algae, that obtain their energy via photosynthesis and include unicellular and colonial species. Some species occur commonly in aquaria where they're normally regarded as pests.

Used in 21 profiles

decomposition

Natural, ecological process in which organic material is broken down into simpler substances which may then be used by other organisms. Typically biotic and carried out by microbes, worms, and other organisms but can also be abiotic and occur via chemical or physical processes such as oxidation or hydrolysis.

Used in 204 profiles

defecate

To discharge waste from the body via the anus.