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Glossary: abdomen

February 15th, 2012 — 2:05pm

The lower part of the body that lies in front of the cloaca and contains the digestive and reproductive organs; also referred to as the belly.

Glossary: aberrant

February 22nd, 2014 — 10:06pm

Departing from an accepted standard.

Glossary: abiotic

February 15th, 2012 — 2:05pm

Non-living. Abiotic factors in an environment include such items as sunlight, temperature, wind patterns, and precipitation, for example.

Glossary: acclimatisation

February 24th, 2012 — 3:52pm

See acclimation.

Glossary: acid

February 15th, 2012 — 2:05pm

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.

Glossary: acidic

February 15th, 2012 — 2:05pm

Acid; tending to form an acid; having a pH less than 7.0; having a relatively high concentration of hydrogen ions.

Glossary: acidophile

February 15th, 2012 — 2:05pm

An organism which naturally dwells in an acidic environment.

Glossary: acidophilic

February 15th, 2012 — 2:05pm

Thriving in an acidic environment.

Glossary: acriflavine

February 15th, 2012 — 2:05pm

An antiseptic used to treat external fungal plus general bacterial and protozoan infections in ornamental fishes and disinfect fish eggs in aquaculture. Also known as Acriflavinium chloride, ie., the chemical compound from which it is formed.

Glossary: Actinopterygii

February 15th, 2012 — 2:05pm

Class of ray-finned fishes, so-called because they possess fin rays. Contains 95%+ of known fish species.

Glossary: activated carbon

February 23rd, 2012 — 11:50pm

Processed, porous, highly adsorptive form of carbon also known as activated charcoal or active carbon. Used in aquaria to remove toxins such as chlorine, chloramine, some heavy metals, and especially organic molecules, but exerts no action on ammonia, nitrite, nitrate, phosphate or inorganic salts. Since it has a finite surface area it requires periodic replacement […]

Glossary: acuminate

February 15th, 2012 — 2:05pm

Tapering or pointed. Used to describe the shape of the caudal fin in some fishes.

Glossary: adaptive radiation

February 15th, 2012 — 2:05pm

Speciation of a taxonomic group into several forms, each specialised to fill a previously vacant ecological niche, as exemplified by Rift Lake cichlids, for example.

Glossary: adductor

February 22nd, 2014 — 10:05pm

A muscle whose contraction moves a limb or other part of the body towards the midline of the body or other part.

Glossary: adipose

February 15th, 2012 — 2:05pm

Of, relating to or composed of animal fat.

Glossary: adipose crest

February 15th, 2012 — 2:05pm

Fatty ridge of flesh extending along the dorsal or ventral surface of the caudal peduncle in certain fishes, e.g., some Schistura spp.

Glossary: adipose eyelid

February 22nd, 2014 — 10:03pm

Transparent eyelid present in some fishes, that covers some or all of the eye.

Glossary: adipose tissue

February 15th, 2012 — 2:05pm

Type of connective tissue composed of cells specialised for production and storage of fat globules. The principle means of fat storage in the animal body.

Glossary: adipose-fin

February 15th, 2012 — 2:05pm

A small, fleshy, rayless fin present in certain fishes and located behind the dorsal fin.

Glossary: adsorption

February 15th, 2012 — 2:05pm

The process by which molecules of a substance are attracted to and accumulate on the surface of another substance, such as a solid, but do not enter it. Activated carbon is highly adsorptive.