Results for “od”

cross

To crossbreed; an organism produced by crossbreeding; a hybrid

Used in 58 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

crustacean

Any member of the predominantly aquatic arthropod grouping Crustacea which currently contains almost 70,000 recognised species, including all crabs, lobsters, crayfish, shrimp, krill and barnacles. It's difficult to define their characteristics since the group is of arguable hierarchical status, generally regarded to represent either a Phylum or Subphylum.

Used in 421 profiles

cultivar

Plant or group of plants produced and maintained by cultivation.

CW number

Coding system used to organise and refer to unidentified catfishes, though not necessarily undescribed or distinct species, of the genus Corydoras. Works in tandem with the similar C number system. The system was invented by Ian A. M. Fuller in reference to his website 'Corydoras World' but is now in popular use worldwide.

Used in 65 profiles

Cyclops

Genus of freshwater copepods characterised and so named by possession of a single, large, median eye. Sometimes cultured as food for fry or very small fishes.

Used in 8 profiles

Daphnia

Any representative of the genus Daphnia; small, planktonic crustaceans commonly referred to as 'water fleas' and often used as food for ornamental fishes. They're members of the order Cladocera and reproduce by parthenogenesis.

Used in 749 profiles

deep sand bed

Method of filtration, mostly used in marine aquaria, whereby the increased depth of the sand substrate facilitates formation of an anaerobic layer where nitrate can be converted into nitrogen gas. Also known as "Jaubert" or "plenum" system and often associated with live sand.

defecate

To discharge waste from the body via the anus.

deionisation

Purification process, often abbrevaited to DI, by which mineral ions are removed from water, usually via ion exchange over a specialised type of resin. The process does not remove non-ionic molecules thus organic cells such as bacteria tend to remain. Often used in conjunction with reverse osmosis to produce more-or-less pure water which normally requires a degree of remineralisation before being used in aquaria.

demersal

Living, occurring close to, deposited or sinking onto the bottom of a water body.

Used in 5 profiles

dermis

Innermost layer of skin containing nerve endings and blood vessels. Lies under the epidermis and also known as corium.

diapause

Period of suspended development in an organism characterised by greatly reduced metabolic rate; resting phase. Especially common under times of environmental stress, e.g., hibernation, aestivation.

Used in 3 profiles

dioecious

Within a species, having the male and female reproductive organs in separate individuals.

dissolved oxygen

The concentration of oxygen dissolved in a water body. Normally expressed in milligrams per liter, parts per million, or percentage saturation.

Used in 296 profiles

distal

Located away from the point or origin of attachment or a central point of the body. Opposite of proximal.

Used in 133 profiles

DNA

Abbreviation for deoxyribonucleic acid, a double-stranded, self-replicating genetic material comprised of a chain of nucleotides. Present in nearly all living organisms and is the main constituent of chromosomes. DNA segments containing genetic instructions are called genes and normally direct production and activity of RNA.

Used in 11 profiles

dorsum

The upper surface of the head, body or part.

Used in 157 profiles

drip acclimation

Method of acclimation used for sensitive fish species in which the animals are first placed into a clean bucket or other container before water is slowly dripped in by siphon from the aquarium into which they are to be introduced. Can be carried out using a purchased kit or home-made using a length of airline plus an airline clamp.

dropsy

Accumulation of fluid in cellular tissue or other body cavity, symptomatic of some underlying infection or other health issue but not a disease in itself. May also be referred to as 'oedema' or 'edema'.