Results for “ichthyology”

ichthyology

Branch of zoology concerned with the study of fishes.

Used in 3 profiles

ampullae

Used in ichthyology to describe dilations in the semicircular ear canals of some fishes.

bar

Used in ichthyology to describe a vertical or diagonal marking, normally with well-defined margins, often located on the flank of a fish.

Used in 399 profiles

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

cardiform

Arranged like a series of combs or the wire bristles on a wool card. In ichthyology used most commonly to describe the form and arrangement of teeth in certain species.

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

clearwater

In ichthyological and aquarium literature typically refers to habitats containing transparent water with no material in suspension or staining by organic material, thus differing from whitewater or blackwater environments.

Used in 11 profiles

clutch

Used in ichthyology to refer to the number of eggs deposited in a single spawning event, particularly when some form of nest is used.

Used in 10 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

dichotomous key

Species identification key comprising pairs of alternative choices arranged in a series of couplets, used commonly in ichthyological papers.

eye diameter

In ichthyology, the greatest distance between the margins of the eye.

Used in 38 profiles

isthmus

Narrow strip of land connecting two larger areas, or a narrow strip of tissue connecting two larger body parts. In ichthyology often used in reference to the fleshy throat region of a fish which externally separates the two gill chambers.

Used in 26 profiles

meristics

In ichthyology, the counting of quantitative characters, such as the number of fins, fin rays or scales.

Used in 8 profiles

naked

In ichthyology, scaleless or smooth skin.

Used in 72 profiles

radial

In ichthyology, a bony or cartilaginous support for a fin ray or spine.

Used in 15 profiles

sample

In ichthyology, a collection of fishes made from a particular locality or specified area.

Used in 8 profiles

terminal

In ichthyology, situated at or forming the end of, e.g., a 'terminal' mouth is located at the anterior-most part of the head.

Used in 25 profiles

whitewater

In ichthyological and aquarium literature typically refers to habitats with turbid water containing material in suspension and often rich in nutrients and dissolved ions, thus differing from clearwater or blackwater environments. Not to be confused with the term 'white water' which refers to turbulent water typically formed in rapids.

Used in 17 profiles