Results for “sp.”

dioecious

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

dither fish

Fish or group of fish, typically inhabiting open water in the mid-to-upper water column, used by aquarists to reduce innate shyness in other species.

Used in 65 profiles

dorsal-fin

Median, rayed, unpaired fin located on the dorsal surface (back) of most fishes. Its main purpose is to prevent the animal rolling and enable it to turn sharply. Some species possess more than one dorsal fin, in which case the anterior one is referred to as the first.

Used in 860 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.

ecological niche

The specific position or function that an organism fills in an ecosystem.

Used in 77 profiles

ecotype

A distinct population of a species adapted to occupy a particular habitat due to localised natural selection.

Enchytraeus

Genus of annelid worm of which two species, E. albidus and E. buchholzi, are cultured by aquarists to use as fish food.

epibranchial organ

Present in some microphagous fishes and comprises a paired dorsal diverticulum located towards the posterior of the pharynx. In the majority of species it's divided into two sections by additional gill rakers which trap small food particles.

epural

Located on the dorsal side of the caudal fin; elongate bone which supports the caudal fin rays, positioned above the urostyle and posterior to the last neural spine.

Used in 8 profiles

erectile

Capable of being erected, raised, or elevated, e.g. an erectile fin spine.

Used in 2 profiles

extinct

Of a species or other taxonomic grouping, having no living members; no longer in existence.

Used in 22 profiles

extirpate

To destroy completely; to exterminate. Sometimes applied to cases where a species is extinct in one country or area but extant in others.

F1

Term used in the fields of genetics and selective breeding in reference to the first filial generation, i.e., hybrid offpsring, of a cross between two distinctly different parental lines. Often used in aquarium literature to refer to offspring of F0 parents whether of the same species or not.

feeder fish

Live fish used specifically for feeding to another fish.

Used in 126 profiles

filter feeding

Feeding behaviour in which solid, organic particles are filtered from the surrounding water. Normally involves some degree of specialised morphology.

Used in 1 profile

fishery

Specified area or region in which fish are caught or collected; place where fishes are reared.

Used in 25 profiles

flare

To expand or open outwards; to spread.

Used in 8 profiles

floating meadow

Floating tangle of plants comprising one or more species. Important habitat for many freshwater fishes in certain biotopes.

Used in 3 profiles

fork length

Length of a fish specimen measured from the tip of the snout to the end of the medial caudal fin rays, i.e., the deepest point of the 'fork' formed by the fin. Tends not to be used in systematics.