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Parasite - 'par-u-sIt

Any organism which lives on or inside a host animal or plant. The organism will recieve nutrients from the host, but the host recieves nothing in return and is often harmed or killed by the organism.

Parasiticide - 'par-u-sIt-i-cId

Any chemical or substance used to kill and eliminate parasites.

Parasitism - par-u-sIt-i-zym

The relationship between two organisms, where one (the parasite) receives benefit from the other (the host) and in turn does harm to it.

Particle Filter - 'pÔr-ti-kul 'fil-tur

Any filtration device, mechanical or chemical, where its main purpose is to remove very small pieces of matter from water.

Pectoral Fin - 'pek-tur-ul fin

Either of the fins located on the side of the fish directly behind the head. Used to control movement.

Pedal Disk - 'pe-dal disk

The base of an anemone used to attach itself to rockwork or substrate. Also utilized for locomotion.

Pelvic Fin - 'pel-vik fin

Either of the upmost fins located on the "bottom" of the fish, directly behind the head. Used to control movement.


pH is a measurement of the acidity or alkalinity of water, and is indicated by a scale of 1 to 14. pH is a measurement of the concentration of hydrogen and hydroxide ions present in the water. The interpretation of the measurement will tell the acidity or alkalinity of water, indicated by a scale of 1 to 14. Acidic water will fall in the range of 1 to 6 and Alkalinity occurs between the range of 8 to 14. A measurement of 7 stipulates neutral water. pH can be effected by everything occurring in the environment such as waste, food and substrate to name a few. A rise or drop in pH can severely affect the animals in the aquarium. Keep in mind the fish from fresh, brackish and saltwater come from a wide spectrum of pH ranges, and care should be taken to provide and maintain the appropriate level for you specimen.

Phoresis - for-eh-sys

A behavior exhibit by, but not limited to, some urchins or crabs, where camouflage is achieved by carrying or attaching objects such as subsrate or algae to themselves.

Photosynthesis - `fow-tow-'sin-thi-sis

The manufacturing of food by convertion of light energy. This is preformed by, but not limited to, plants, algae and some bacteria.

Photosynthesizer - `fow-tow-'sin-thi-si-zer

Any organism that has the ability to preform photosynthesis.

Phytoplankton - `fIt-u'-plangk-ton

Photosynthetic or plant organisms found floating in the water. Typically unicelluar algae.

Plankton - 'plangk-tun

Very small to microscopic plant or animal organisms found floating, usually in mass quantities in both fresh and marine waters.

Power Filter - 'paw-ur 'fil-tur

Any filtration device which utilizes a powered water pump to move the water and force it through filtration media.

Powerhead - 'paw-ur-hed

A submersible self-contained water pump, typically utilized as a way to generate extra current within the aquairum or as part of an undergravel filtration system.

ppb -

Abbreviation for parts per billion.


Abbreviation for parts per million.


Abbreviation for parts per thousand.

Prefilter - prE-'fil-tur

Any device, such as a sponge or grate, used before the main filtration unit, or as the first stage of the filtration unit, to trap large objects and pieces of matter.

Protein Skimmer - 'prow-teen 'skim-ur

A Protein Skimmer is a filtration device which seperates and removes dissolved organic and inorganic matter from water via a column of air bubbles. The waste is carried up through the water by the air bubbles and the resulting foam is deposited into a container for emptying. Also known as Foam Refractioner.

Protein Skimming - prow-teen 'skim-ming

The act of using a protein skimmer or the act of waste removal via foam refraction.