Ichthyological terms, not general ones.
The bottom or lowest part of something. Biology. The point of attachment of a part or organ, e.g., a fin. Chemistry. A substance that can accept protons or donate pairs of electrons. The chemical opposite of an acid. Bases have a pH greater than 7.0 and a solution containing one or more bases is often referred to as an alkali.
Used in 1,187 profiles
The vertical distance between the dorsal and ventral margins of the body measured at the base of the pectoral fin where it joins the body. In most icthyological works the greatest dimension, normally anterior to the dorsal fin, is taken but in some cases body depth is measured at the origin of pectoral, pelvic and first anal. Fins or fin bases are not included in the measurement, however.
Used in 85 profiles
A surface on which an organism lives, moves or is attached to; the base material of a water body; a benthic habitat. Also used in reference to base material when added to an aquarium.
Used in 1,478 profiles
A substance that can donate protons or accept pairs of electrons. The chemical opposite of a base. Acids have a pH of less than 7.
Used in 123 profiles
Measure of the buffering capacity of a given water body, i.e. its capacity to neutralize acids and bases thereby maintaining a fairly stable pH. Water containing compounds, such as bicarbonates, carbonates, and hydroxides has a stronger such capacity and is referred to as hard water, while water lacking or deficient in them is termed soft water. Soft water aquaria tend to be susceptible to pH crashes if not maintained correctly.
Used in 6 profiles
Anteriormost point at which the anal fin base is attached to the body.
Used in 108 profiles
A modified, often elongate, scale or group of scales located at the base of the pectoral or ventral fins in some fishes.
At, towards or constituting a base; primitive. Opposite of derived. In cladistics, used to in reference to a clade within which other clades are nested.
Used in 92 profiles
Teeth on the median ventral plate (base of the tongue) overlying the basibranchial bones between the gill arches in some fishes.
Of, relating to, forming, or being a base.
Used in 77 profiles
At or on the base of the caudal fin.
Being a base, or the extent to which a substance is basic.
Basal bone or cartilage located at the base of the paired fins in some fishes.
Used in 2 profiles
A substance that reduces change in the acidity of a solution when an acid or base is added.
Used in 8 profiles
The solid central part of a vertebra, not including the bases of the neural arch.
Taxonomical method used to classify species of organisms into clades, each of which contains an ancestor organism and all its descendants, based on synapomorphies (shared derived characters). Cladistic classifications are usually presented in the form of a cladogram.
Major bone of the pectoral girdle. Extends upward from the pectoral fin base and forms the rear margin of the branchial cavity. Articulates with the supracleithrum dorsally, the scapula and coracoid ventrally. Also known as proscapulum.
Used in 4 profiles
Paired endochondral bone located at the base of the pectoral fin upon which rest the pterygials or actinosts. Attaches to the cleithrum anteriorly.
Used in 18 profiles
A division of organisms into two groups, typically based on a characteristic present in one group and absent in the other.
Section of the caudal fin located between the base and dorsal margin.