Results for “sp.”

formalin

Aqueous solution of formaldehyde used as a preservative for biological specimens.

Furan-2

Branded, broad spectrum antibiotic used to treat both gram-negative and gram-postive bacterial infections in aquarium fishes. Contains the active ingredients Nitrofurazone and Furazolidone.

gamete

Cell that fuses with another during fertilization in organisms employing sexual reproduction, e.g., an egg or sperm cell.

gang valve

Plastic or metal, adjustable valve used to split a length of air line, and allowing two or more air-driven devices to be operated at once. Also known as an air-control valve.

gape

The width of the space between the jaws when open to their maximum extent.

Used in 10 profiles

gas bladder

Gas-filled sac with 1-3 chambers, situated just below the vertebral column in most ray-finned fishes. Its primary function is to aid in buoyancy by offsetting the weight of heavier structures such as bone, but is also used for respiration or sound production in some species. Often reduced in benthic fishes and sometimes absent altogether. Also known as the air or swim bladder.

Used in 104 profiles

Gastropoda

Class of molluscs of which the majority of members possess a flattened, muscular foot for locomotion and a head bearing specialised sensory tentacles, with some also having a univalve, coiled shell. Includes all snails, whelks, limpets, conches, and slugs.

genetics

Branch of biology concerned with the study of heredity and variation of organisms; the genetic constitution of a single organism, species, or other taxonomic group.

Used in 4 profiles

Gram's method

Method of differentiating bacterial species into groups based on the structure of their cell walls, using a particular, violet-coloured, staining technique.

grindal worm

Vernacular name for the annelid worm Enchytraeus buchholzi (Vejdovsky, 1879), a species commonly cultured by aquarists for use as live fish food. Smaller, more adaptable, and temperature-tolerant than the related white worm, Enchytraeus albidus Henle, 1937.

Used in 78 profiles

groundwater

Water held beneath the Earth's surface. Typically supplies wells and springs.

Used in 6 profiles

guanine

Crystalline chemical compound giving a metallic, iridescent golden, silvery, white, blue or greenish sheen to the scales of certain fishes. Occurs naturally in some fish species but in others its formation is driven by parasitic infection.

Used in 4 profiles

hastate

Shaped like the head of a spear.

heterospecific

Of or belonging to a different species.

Used in 18 profiles

Hexamita

Genus of parasitic flagellates, some species of which inhabit the intestines of fishes. May cause head and lateral line erosion.

hierarchy

Series of ordered or groupings or rankings within a defined system. Taxonomy is a form of hierarchy as are the ranked social groupings typical of certain fish species. The latter form of social hierarchy is also known as a pecking order.

Used in 85 profiles

homonym

Two or more names of identical spelling, or differing only in suffix, that have been applied to different members of the same taxonomic rank and of which only one can be valid at any given time.

Used in 2 profiles

hybridisation

The process of crossing different species or populations of organisms in order to produce hybrids.

Used in 115 profiles

Hydra

Genus of freshwater cnidarian existing only in sessile, solitary polyp form attached to the substrate at one end and with a mouth surrounded by up to 12 tentacles at the other. Members are predatory, feeding mostly on small invertebrates, and regarded as pests in aquaria due to their appearance as whitish spots on submerged surfaces and tendency to prey on fish fry.

Used in 1 profile

hydrometer

Instrument used to measure the density of a liquid, normally in the form of specific gravity. Can be inaccurate should calcium deposits form on the swing arm, for example, and generally less reliable than a refractometer.