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Glossary: C number

December 9th, 2012 — 1:08pm

Coding system used to organise and refer to unidentified catfishes, though not necessarily undescribed or distinct species, of the genus Corydoras. Works in tandem with the similar CW number system. The system was invented by German aquarist Hans-Georg Evers and first appeared in the magazine ‘DATZ’ but is now in popular use worldwide.

Glossary: calcareous

February 15th, 2012 — 3:28pm

Composed of, containing, or characteristic of calcium carbonate, calcium, or limestone; chalky.

Glossary: caldera

December 21st, 2012 — 4:47pm

Cauldron-like volcanic feature usually formed by the collapse of land following a volcanic eruption, sometimes confused with volcanic craters. Often fill with water to form lakes.      

Glossary: caniniform

March 16th, 2013 — 3:31pm

Resembling or having the form of a canine tooth

Glossary: canister filter

February 24th, 2012 — 11:26am

See external filter.

Glossary: carapace

February 22nd, 2014 — 9:41pm

The hard upper shell of a tortoise, crustacean, or arachnid.

Glossary: carbonate hardness

February 22nd, 2012 — 3:41pm

Measure of the alkalinity of water as dictated by the presence of bicarbonate and carbonate ions. Usually expressed as parts per million, milligrams per litre, or degrees (dKH) of which 1 dKH corresponds to 17.848 ppm. Sometimes used a synonym for, but not equivalent to, temporary hardness.

Glossary: cardiform

May 25th, 2012 — 2:44pm

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.

Glossary: cardioid scale

February 15th, 2012 — 3:28pm

A scale possessing a distinct notch on the posterior margin.

Glossary: carinate

February 15th, 2012 — 3:28pm

Possessing a distinct ridge or keel.

Glossary: carnivorous

February 15th, 2012 — 3:28pm

Feeding on animals.

Glossary: carotenoid

February 15th, 2012 — 3:28pm

Any of a category of yellow to red pigments occurring naturally in plants and animals and including the carotenes and xanthophylls. Animals obtain carotenoids in their diets and they're known to enhance colouration in some fishes.

Glossary: carrion

February 15th, 2012 — 3:28pm

Dead and decaying animal flesh.

Glossary: cartilage

February 15th, 2012 — 3:28pm

Specialised, toughened, elastic, fibrous connective tissue found in various parts of the body and forming the temporary skeleton in embryonic and very young fishes, but mostly lost as the majority of species mature. Retained throughout life in cartilaginous fishes.

Glossary: cartilaginous fishes

February 15th, 2012 — 3:28pm

A fish with a skeleton composed mainly of cartilage; major groups include sharks, rays and skates.

Glossary: catadromy

February 15th, 2012 — 3:28pm

Migration of fishes from freshwater to the sea.

Glossary: cataract

February 15th, 2012 — 3:28pm

A dramatic, steep fall in a watercourse.

Glossary: catchment

February 15th, 2012 — 3:28pm

A collecting of water, especially rainwater.

Glossary: catchment basin

February 15th, 2012 — 3:28pm

The entire area drained by a given river or lake plus associated tributaries. Same meaning as drainage basin, river basin, watershed, etc..

Glossary: caudal

February 15th, 2012 — 3:28pm

Towards the poterior or caudal fin.