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Glossary: hole-in-the-head

February 16th, 2012 — 5:13pm

See head and lateral line erosion. Often abbreviated to HITH.

Glossary: holotype

February 15th, 2012 — 3:30pm

The single specimen designated as the name-bearing type of a nominal species or subspecies.

Glossary: homeostasis

November 6th, 2012 — 4:35pm

The ability or tendency of an organism or cell to maintain internal equilibrium by adjusting its physiological processes.

Glossary: homologous

February 22nd, 2012 — 1:58pm

Exhibiting a a degree of similarity, e.g., in anatomical position, structure, function , or character that may suggest a shared ancestral or evolutionary origin.

Glossary: homonym

February 15th, 2012 — 3:30pm

Two or more names of identical spelling, or differing only in suffix, that have been applied to different members of the same taxonomic rank and of which only one can be valid at any given time.

Glossary: homoplasy

February 15th, 2012 — 3:30pm

A character or trait shared by two or more unrelated taxa. Typically the result of convergent or parallel evolution.

Glossary: horny

February 15th, 2012 — 3:30pm

Hard and rough in texture.

Glossary: hospital tank

February 22nd, 2012 — 2:02pm

See quarantine tank.

Glossary: humeral

February 15th, 2012 — 3:30pm

Of, relating to, or situated on the humerus.

Glossary: humeral process

February 15th, 2012 — 3:30pm

Bony process extending posteriorly from the pectoral girdle, above the base of the pectoral fin. Present only in certain fishes.

Glossary: humeral spot

January 19th, 2013 — 5:25pm

A marking on the body in the area¬†analogous to the humerus, or shoulder. In fishes it’s normally located above the pectoral-fin and behind the opercle. There may be more than a single such spot in some species.

Glossary: humerus

February 15th, 2012 — 3:30pm

The pectoral girdle in most fishes.

Glossary: husbandry

February 22nd, 2012 — 2:07pm

Agricultural cultivation or production of plants or livestock, especially domesticated varieties.

Glossary: hyaline

February 15th, 2012 — 3:30pm

Glassy; translucent; transparent.

Glossary: hybrid

February 15th, 2012 — 3:30pm

Organism resulting from a natural or artificial cross between genetically-unlike individuals.

Glossary: hybridisation

February 15th, 2012 — 3:30pm

The process of crossing different species or populations of organisms in order to produce hybrids.

Glossary: hydrology

February 15th, 2012 — 3:30pm

The scientific study of water, its distribution, properties and effects on and within the Earth's surface and atmosphere.

Glossary: hydrometer

February 15th, 2012 — 3:30pm

Instrument used to measure the density of a liquid, normally in the form of specific gravity. Can be inaccurate should calcium deposits form on the swing arm, for example, and generally less reliable than a refractometer.

Glossary: hydrophilic

February 15th, 2012 — 3:30pm

Having an affinity for water.

Glossary: hydrophobic

February 15th, 2012 — 3:30pm

Lacking an affinity for water.