Not an official term in genetics, but often used in reference to the founder, or parental, generation in a line of captive-bred organisms. Also used in aquarium literature to refer to wild caught fishes or a pair or group of assumedly unrelated individuals being used for breeding purposes.

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.

Offspring of the second filial generation, resulting from a cross between F1 individuals. Future such generations are termed F3, F4, etc..

Capable of functioning or existing under varying environmental conditions.

Sickle-shaped.

Taxonomic rank below order and above genus. Contains one or more genera.

Relatively long, sharp, pointed tooth.

Process of moving water over eggs or fry via rapid movement of the fins, thus aerating or removing solid particles from them.

Producing or capable of producing offspring or vegetation. Sometimes used in reference to particularly productive organisms.

Fertility.

Live fish used specifically for feeding to another fish.

Existing in a wild or uncultivated state; returning or transferring to such a state having previously been domesticated.

Capable of reproduction.

The state of being fertile.

Thread-like, slender process or appendage; thin chain of cells.

Of, relating to, or resembling a filament.

Of, relating to or being a generation or the series of generations following the parental (F0) generation.

Threadlike; shaped like a filament.

Device through which water is passed in order to remove suspended solid particles (mechanical filtration) or chemical impurities (biological filtration); any device which assists in maintenance of water quality.

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