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Results for “pH”

Ichthyological terms, not general ones.

Species 113Articles 21Glossary 250

  • pelagic phase

    Period of time during the life cycle spent floating freely in the water column, usually as a larval constituent of plankton. Relatively common in marine fishes but also typical of amphidromous and diadromous species.

  • eutrophication

    Hypertrophication; process by which addition of artificial or natural substances, such as nitrates and phosphates, to a body of water increases the concentration of dissolved nutrients, this in turn stimulating the growth of aquatic plant life, especially phytoplankton, and typically resulting in depletion of dissolved oxygen. Negative effects include reductions in populations of fishes and other organisms incapable of withstanding this hypoxia.

    Used in 8 profiles

  • bryophyta

    The plant phylum comprising mosses and liverworts. Members have no true roots, stem or leaves.

  • ecophenotype

    A phenotype resulting from environmental or ecological conditions rather than genetic inheritance.

  • exophthalmia

    Abnormal bulging of the eye from the orbit commonly referred to as 'pop eye' in aquarium literature and resulting from excessive accumulation of fluid or gases at the back of the socket. Not a disease but a secondary sympom of some other infection or physical issue.

  • metamorphosis

    A physical change or succession of such changes in form during the life cycle of an organism.

    Used in 3 profiles

  • paedomorphism

    Phylogenetic state in which juvenile or larval characters are retained in and throughout the adult stage. May arise via neoteny or progenesis.

  • paraphyletic

    In phylogenetics, a paraphyletic taxon is, loosely, an artificial grouping that does not include all descendants from the common ancestor of its members; monophyletic group from which one or more of clades is omitted in order to form an additional group.

    Used in 42 profiles

  • sexual dimorphism

    Phenotypic difference between males and females of a single species. Used in species profiles here on SF to refer to differences in morphology or colour pattern, but officially also refers to behavioural differences.

    Used in 99 profiles

  • acidophile

    An organism which naturally dwells in an acidic environment.

    Used in 1 profile

  • amphibian

    A class of cold-blooded vertebrates, generally requiring water for reproduction.

    Used in 32 profiles

  • amphibious

    Living or able to live both in water and on land.

    Used in 3 profiles

  • amphidromous

    Migrating from fresh to salt water or from salt to fresh water at some stage of the life cycle other than the breeding period.

    Used in 34 profiles

  • amphidromy

    A form of diadromy in which fishes migrate between fresh and marine water as part of their life cycle for some purpose other than spawning, e.g., newly-hatched, arvae may be swept downstream into the sea where they spend a period of time before migrating back into fresh water to mature and eventually reproduce.

    Used in 15 profiles

  • amphipod

    A crustacean of the order Amphipoda, most of which are small and have a laterally-compressed shape. The suborder Gammaridea contains all freshwater species.

    Used in 1 profile

  • apomorph

    An organism existing in an evolutionary state that represents a morphological advance compared to a previous state. Occurs at an evolutionary branching point and is subsequently carried through only a single descendant group.

  • apomorphy

    A derived character state of a clade; a feature novel to a species and its descendants.

    Used in 2 profiles