Results for “od”

Tubifex

Genus of aquatic annelid worms inhabiting the sediment layer in rivers, lakes and, less frequently, sewage channels. Raised commercially and sold live, frozen or freeze-dried as fish food.

Used in 254 profiles

várzea

Type of seasonally-inundated floodplain forest in the Amazon region. The term is normally used for those forests flooded by whitewater rivers but is sometimes used to refer to blackwater environments for which the more traditional term is igapó.

Used in 9 profiles

vascularised

Containing vessels that carry or circulate fluids, especially blood.

Used in 198 profiles

vegetative

Of, relating to, or capable of growth, or functioning in processes such as growth or nutrition rather than sexual reproduction.

Used in 28 profiles

ventrum

Relating to or situated on or close to the abdomen or lower surface of an animal's body; abdominal

vicariance

Separation or division of a population by a geographic barrier, such as a mountain or body of water, resulting in evolution into new varieties or species.

viscera

The soft internal organs of the body.

viviparous

Giving birth to living offspring that develop within the mother's body, e.g., most mammals, many reptiles, some fishes. There is a direct placental or equivalent connection to the mother, meaning that members of the family Poeciliidae are not strictly viviparous and more correctly referred to as ovoviviparous.

Used in 3 profiles

voucher specimen

Specimen housed in a permanent, usually museum, collection, ideally including detailed collection data such as date, location, etc.. Assigned a specific code in order in case later reference is required. May be a type specimen.

warm water

Used in reference to water bodies with a temperature that exceeds 75.2°C/24°C during the summer.

Used in 3 profiles

water column

Conceptual column representing the vertical section of a water body from surface to substrate.

Used in 124 profiles

watershed

An ridge or otherwise elevated piece of land that physically separates areas drained by different river systems. Also used to refer to an area or region drained by a particular river, river system, or other water body.

Used in 165 profiles

Weberian apparatus

Anatomical structure connecting the swim bladder to the inner ear found in members of the fish superorder Ostariophysi. Conveys sound and changes in pressure, and comprises four or five modified vertebrae.

Used in 5 profiles

Weberian ossicle

Any of the modified vertebrae comprising the Weberian apparatus in Ostariophysian fishes, individually named the claustrum, scaphium, intercalarium and tripus.

wet/dry filter

Type of filter normally placed under the aquarium, and often home-made. The basic premise is that water trickles vertically downards through separated compartments containing mechanical and biological filter media with spaces inbetween so that it is also exposed to the air briefly. It then collects in a base chamber or sump from where it is pumped back to the main aquarium. There are many commercial designs available, some of which are more effective than others. Not popular in marine reef aquaria due to the associated accumulation of nitrates as by-product.

white worm

Vernacular name for the annelid worm Enchytraeus albidus Henle, 1937, a species commonly cultured by aquarists for use as live fish food.

Used in 8 profiles

whitebait

Collective term for the young of various fishes, especially herring and sprat. Sometimes used as food for predatory species in aquaria.

Used in 48 profiles

worms (parasite)

Any species of nematode worm which spends part of its life cycle as an internal parasite within a fish's intestinal system.

xylophagous

Feeding on, living in, or destructive to wood.

Used in 1 profile