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Results for “GH”

Ichthyological terms, not general ones.

Species 9Articles 1Glossary 136

  • ctenoid scale

    Scale type having ctenii on the posterior edge and a consequent rough texture.

    Used in 22 profiles

  • 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

  • Dahomey Gap

    Dry corridor of savanna interrupting the West African rain forest and separating it into two parts known as the western Guinea and Central African Congo zones and reaching the Atlantic coast in Togo and Benin. Due to the separation, the resident flora and fauna of the Guinea and Congo zones differs to a significant extent. In terms of climate the gap has been wetter a number of times through history and has existed in its current state for around 4000 years.

    Used in 6 profiles

  • description

    Used in ichthyology in reference to a written description of a new species, usually in the form of a scientifically-published paper though many have been also appeared in aquarium literature, particularly in the late twentieth century. Also referred to as 'type description' or 'original description'.

    Used in 283 profiles

  • diurnal

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

    Used in 6 profiles

  • emarginate

    Having a notched margin or edge. Often used in reference to a caudal fin with a slightly concave shape.

    Used in 101 profiles

  • ethmoid

    Light, spongy bone of the skull located between the orbits and forming part of the eye socket and nasal cavity.

  • eyed egg

    A fish egg within which the embryo has developed to a point whereby the eyes are visible through the external membrane.

  • F0

    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.

  • filter

    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.

    Used in 470 profiles

  • fishery

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

    Used in 25 profiles

  • fitness

    In biology, Darwinian fitness or simply fitness of a biological trait describes how successful an organism has been at passing on its genes. The more likely that an individual is able to survive and live longer to reproduce, the higher is the fitness of that individual.

  • fungi

    Kingdom of eukaryotic microorganisms lacking chlorophyll and vascular tissue and possessing chitinous cell walls. Highly variable in form and includes all yeasts, molds, and mushrooms.

    Used in 1 profile

  • gape length

    Straight-line measurement from the snout tip to the angle of the mouth.

  • 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

  • general hardness

    Measure of the overall concentration of calcium, magnesium and other ions in a water sample with values usually quoted in units of degrees (dGH), of which 1 dGH corresponds to 17.848 ppm. Also referred to as total or permanent hardness.

    Used in 59 profiles

  • genital papilla

    Small tube arising from the urogenital opening in some fishes through which male or female gametes are expelled. May only be visible during the reproductive period depending on taxon. Its shape can sometimes used as a feature to identify the gender of an individual.

    Used in 114 profiles

  • gill

    Respiratory organ of fishes and some other aquatic organisms comprising a highly-vascularised membrane or outgrowth.

    Used in 314 profiles

  • gill filament

    Comb-like lamellae found in the gills, through which oxygen is extracted and carbon dioxide expelled.

    Used in 38 profiles

  • granular

    Resembling or consisting of small particles or granules; having a rough texture or structure.

    Used in 6 profiles