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Results for “GH”

Ichthyological terms, not general ones.

Species 9Articles 1Glossary 136

  • bioluminescence

    Emission of visible light by living organisms including certain fishes.

  • blackwater

    In ichthyological and aquarium literature typically refers to water rich in humic acids and poor in nutrients such as that associated with ancient peat swamps or parts of the Amazon river drainage, and thus differs from clearwater and whitewater. Fish species inhabiting such environments typically require similar conditions in captivity, especially if wild caught.

    Used in 169 profiles

  • bloodworm

    The freshwater larvae of certain midges which appear bright red due to their high haemoglobin content. Some species of the non-biting Chironomidae family are produced commerically for fish food with the larvae frozen or freeze-dried.

    Used in 1,068 profiles

  • breeding trap

    Net or plastic container suspended or floated in an aquarium and used to isolate gravid female livebearers or fry collected from the main aquarium. Available in a number of designs, with plastic ones generally containing two compartments separated by a grille or opening large enough that fry, but not adults, can pass through.

  • brine

    Water containing high amounts of a salt or salts.

  • bycatch

    Species other than the target caught incidentally when fishing with a net. Sometimes used when referring to aberrant specimens exported among shipments of wild-collected ornamental fishes.

    Used in 49 profiles

  • C 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 CW number system. The system was invented by German aquarist Hans-Georg Evers and first appeared in the magazine 'DATZ' but is now in popular use worldwide.

    Used in 67 profiles

  • cartilage

    Specialised, toughened, elastic, fibrous connective tissue found in various parts of the body and forming the temporary skeleton in embryonic and very young fishes, but mostly lost as the majority of species mature. Retained throughout life in cartilaginous fishes.

    Used in 26 profiles

  • character

    In ichthyology, any characteristic or its attributes used for recognising, describing, defining, or differentiating species, genera or higher taxa. Also used in phylogenetic analyses whereby ancestral (primitive) characters are termed plesiomorphic and derived (novel) characters apomorphic.

    Used in 843 profiles

  • chlorine

    Highly irritating, toxic, gaseous element of the halogen group typically used as a disinfectant, bleaching agent and in purification of drinking water. Considered harmful to fishes.

    Used in 1 profile

  • chlorophyta

    Division of mostly freshwater eukaryotic algae, informally referred to as chlorophytes and containing the true green algae and stoneworts under modern systems of classification. Like higher plants members possess chlorophylls a and b and store food as starch.

  • chondrocranium

    Primitive, cartilaginous skeletal structure enclosing the brain and inner ear formed in the embryo and usally becoming ossified at a later stage. Retained as cartilage throughout life in some fishes.

  • coarse

    Rough or harsh in texture.

    Used in 42 profiles

  • columnaris

    Disease symptom resulting from infection by the bacterium Flavobacterium columnare which is ubiquitous in freshwater environments. Often mistaken for a fungal infection due to its appearance and is referred to variously as mouth rot, mouth fungus, fin rot, gill fungus, body fungus, saddleback columnaris, and cotton wool disease. Highly contagious and usually fatal unless treated with antibiotics or other.

    Used in 1 profile

  • competition

    Simultaneous demand by two or more organisms for a limited resource such as food, light or living space.

    Used in 16 profiles

  • congruence

    Correspondence in physical structure, thought or classification.

  • conjoined

    Brought together or united.

    Used in 3 profiles

  • copiotrophic

    Refers to bodies of water containing high levels of nutrients. Opposite of oligotrophic.

  • countershading

    Form of camouflage in which an organism possesses darker pigmentation on the parts of the body exposed to light and paler on those normally shaded. Many fishes are coloured darker dorsally and lighter ventrally for this purpose.

    Used in 4 profiles