Defending a territory.

In biology, area occupied by an individual, pair or group of animals and often physically defended against others of the same sex or species. May be established on a permanent or temporary basis.

Forming a mosaic-like pattern; checkered.

Used to check the chemistry of an aquarium. There are specific tests for individual chemicals (eg ammonia, nitrIte).

Neurotoxin found in many species of puffer fish. Lethal to humans.

Type of plant body plant body lacking differentiatiation into root, stem, and leaf.

Used to monitor the temperature of an environment eg to ensure that an aquarium is at the desired temperature.

Of or relating to the thorax.

Middle section of the body containing the main organs of circulation and respiration. Not easily defined in fishes.

See pharyngeal teeth.

The measurement of a particular chemical in a solution.

Structure bearing a tooth or teeth shaped like a flattened plate.

In taxonomy, a scientific name derived from a place, region, or other locality.

A specimen collected from the type locality of a given species.

Occurring at, of, or relating to the type locality of a given species.

Measure of the total concentration of both organic and inorganic, microscopic particles suspended in a given liquid. Usually applied only to freshwater systems and measured using a conductivity or total dissolved solids meter with results expressed in units of mg per unit volume of water (e.g., mg/L) or parts per million (ppm). Soft water with […]

Straight line measurement of specimen’s length taken from the tip of the snout to the tip of the longer lobe of the caudal fin, if applicable, and not taking the curve of the body into account. If the caudal lobes are of equal length they may be compressed along the midline before the measurement is […]

Poisonous.

Poisonous, normally protein-based substance of plant or animal origin.

Any chemical element required in small proportions by a given organism in order for certain physiological and biochemical processes to function properly. Often added to marine aquaria using proprietary liquid products and require regular replenishment as they are used up.