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Glossary: pea gravel

February 15th, 2012 — 3:40pm

Gravel-type consisting of small, rounded grains. Commonly-used as a substrate in aquaria.

Glossary: peat

February 15th, 2012 — 3:40pm

A compressed accumulation of partially-decomposed, chiefly vegetable matter typically found in certain marshes, bogs, and peat swamp forests throughout the world. It forms via breakdown of various plants and other organic materials in water when full decomposition is prevented due to localised acidic, anaerobic conditions. As a result of this somewhat specific nature the organisms […]

Glossary: peat swamp forest

February 17th, 2012 — 12:01pm

Type of tropical moist forest lying over a thick bed of acidic peat, over 60% of which occur in Indonesia and Malaysia. Typically contain water with very low pH (<4.0) that is stained brown due to the release of various organic compounds from the decaying peat and thus often referred to as blackwater swamps. Usually […]

Glossary: pecking order

February 22nd, 2012 — 1:50pm

Type of social hierarchy in which individuals within a given group or population are ranked by behavioural and/or physical dominance. Sometimes referred to as a dominance hierarchy.

Glossary: pectinate

February 15th, 2012 — 3:40pm

Shaped like or resembling a comb; possessing projections that resemble the teeth of a comb.

Glossary: pectoral

February 15th, 2012 — 3:40pm

Of, relating to or located on the chest, breast, or thorax; used to refer to a single pectoral fin in relation to fishes.

Glossary: pectoral girdle

February 15th, 2012 — 3:40pm

Bony or cartilaginous structure supporting the forelimbs or anterior fins in vertebrates.

Glossary: pectoral-fin

February 15th, 2012 — 3:40pm

Anterior, paired fin attached to the pectoral girdle of fishes, usually just behind the opercle and corresponding to the forelimbs of higher vertebrates. Assists in controlling direction of movement and swimming speed. Frequently abbreviated to ‘P’ or ‘P1’ in scientific papers.  

Glossary: pelagic

February 15th, 2012 — 3:40pm

Of, relating to, living or occurring in the open sea rather than coastal or inland habitats.

Glossary: pelagic egg

February 15th, 2012 — 3:40pm

Egg floating freely in the water column. Sometimes buoyant.

Glossary: pelagic phase

February 15th, 2012 — 3:40pm

Period of time during the life cycle spent floating freely in the water column, usually as a larval constituent of plankton. Relatively common in marine fishes but also typical of amphidromous and diadromous species.

Glossary: pellet food

February 15th, 2012 — 3:40pm

Commercially-produced, dried, food for fishes compressed into a hard, pelleted form. Usually comprises a combination of macro nutrients, trace elements and vitamins and may contain additional colour-enhancing, medicative or vegetable additives. Available in a range of grain sizes and brands.

Glossary: pelvic disc

February 17th, 2012 — 1:01pm

Disc-shaped modification of the pelvic fins, which are often fused, used to adhere to surfaces via suction. Present in certain fishes, especially members of the family Gobiidae. Also known as sucking disc.

Glossary: pelvic fin

February 15th, 2012 — 3:40pm

Either of the pair of fins, also known as pelvic fins, attached to the pelvic girdle in fishes that help control the direction of movement. Correspond to the hind legs in higher vertebrates and vary in position depending on taxon. Sometimes absent entirely.

Glossary: pelvic girdle

February 15th, 2012 — 3:40pm

Bony or cartilaginous structure supporting the pelvic fins. Sometimes fused with the pectoral girdle.

Glossary: peppered

February 15th, 2012 — 3:40pm

Term sometimes used in reference to fishes with a colour pattern consisting of many small dots or similar markings.

Glossary: pereiopod

December 24th, 2014 — 12:03am

Any of the appendages of a decapod that are used for walking and gathering food.

Glossary: perennial

February 15th, 2012 — 3:40pm

Persisting without interruption; enduring; not seasonal.

Glossary: perforate

February 15th, 2012 — 3:40pm

Pierce; make a hole or holes in.

Glossary: perforated

February 15th, 2012 — 3:40pm

Pierced with a single or number of holes, characterised by perforation.