Results for “cycling”

cycling

Process of maturing a biological filter to some extent prior to the addition of livestock.

cyclo-ctenoid scale

Scale type with morphology intermediate between cycloid and ctenoid, possessing reduced ctenii that are smooth to the touch. Common to certain groups of fishes, e.g., characids.

Used in 3 profiles

breeding cycle

In fishes, the period of time between hatching and first spawning within a particular generataion.

Used in 3 profiles

cycloid scale

Scale type having a smooth margin.

Used in 27 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

algae shrimp

Somewhat misleading vernacular name for the freshwater shrimp Caridina multidentata Stimpson 1860, a popular addition to freshwater aquaria due to its reputation for consuming algae, though in reality it is unable to survive on a diet of algae alone. Formerly referred to as C. japonica De Man 1892 (that name is now regarded as a junior synonym of C. multidentata) and also known as the Amano shrimp. Exhibits an amphidromous life cycle in nature and is thus difficult to breed in captivity, though it has been achieved.

amphidromous

Migrating from fresh to salt water or from salt to fresh water at some stage of the life cycle other than the breeding period.

Used in 34 profiles

amphidromy

A form of diadromy in which fishes migrate between fresh and marine water as part of their life cycle for some purpose other than spawning, e.g., newly-hatched, arvae may be swept downstream into the sea where they spend a period of time before migrating back into fresh water to mature and eventually reproduce.

Used in 15 profiles

annual fish

A fish species which naturally completes its life cycle within a year at the end of which it dies leaving behind fertile eggs which typically survive in the soil and hatch during the next rainy season. Often used in reference to certain South American and African killifishes.

Used in 4 profiles

circadian

Of or relating to biological processes occurring over a 24 hour cycle; daily.

circadian rhythm

A biological process repeated on a 24 hour (daily) cycle.

Used in 13 profiles

diurnal

Of, relating to, or occuring during daylight hours; having a daily cycle. Opposite of nocturnal.

Used in 6 profiles

elasmoid scale

Common scale-type. Found in all teleosts, and often separated into cycloid and ctenoid forms.

ich

Common name for Ichthyophthirius multifiliis, a protozoan which infects freshwater fish. Commonly referred to as white spot due to the characteristic white nodules formed under the skin or gill tissue during the feeding stage of its life cycle.

Used in 18 profiles

metamorphosis

A physical change or succession of such changes in form during the life cycle of an organism.

Used in 3 profiles

micro crab

Vernacular name for the tiny freshwater crab Limnopilos naiyanetri Chuang and Ng 1991, a member of the family Hymenosomatidae, or false spider crabs. It's native to Nakhon Pathom province, southern central Thailand and its body achieves a maximum diameter of around 1 cm. Completely aquatic and apparently spends its entire life cycle in fresh water.

nitrates

Any salt or ester of nitric acid, and the end product of the portion of the nitrogen cycle taking place in most closed aquarium systems (the conversion of nitrates to nitrogen gas in natural systems is carried out by anaerobic microorganisms not normally present in sufficient numbers in aquaria, though this process can be induced by installation of a nitrate reactor). While nitrates are less toxic than ammonia or nitrites, they are still potentially harmful to fishes and other aquatic organisms if allowed to accumulate unchecked, and must therefore be diluted via regular water changes. Aquatic plants also help since they are able to metabolise nitrates to an extent.

Used in 20 profiles

pelagic phase

Period of time during the life cycle spent floating freely in the water column, usually as a larval constituent of plankton. Relatively common in marine fishes but also typical of amphidromous and diadromous species.

phenology

Study of periodic events in the life cycle of organisms and their relationship with seasonal and interannual climatic changes, e.g., migration.

photoperiod

The duration of an organism's daily exposure to light; the period of daylight in each 24-hour cycle.