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Government of Western Australia - Department of Fisheries

Glossary - H

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Area or environment in which an organism normally lives or occurs.

Habitat preference
A measure to explain the preference of organisms to a particular habitat.

Fishing reel not attached to a rod; fishing line held by hand.

The amount of fish or seafood products caught.

Haul net
A piece of net used similarly to a beach seine net but operated from a small boat in shallow water (less than 5 m). The net is used to encircle the fish and then hand-hauled while the vessel is stationery. The meshes used are regulated to select specific sizes of a species.

Artificial environment for the hatching of fish.

Chambered muscular organ in vertebrates that pumps blood received from the veins into the arteries.

Energy which is spontaneously flowing from an object with a high temperature to an object with a lower temperature.

An animal that feeds on plant matter.

An organism with both male and female gonads.

Heterocercal tail
A type of fish fin or tail where the lobes are asymmetrical, as in sharks.

An organism that cannot make its own food and must consume plant or animal matter to meet its body’s energy needs.

The root-like portion of macroalgae that allows the algae to the substrate.

Organisms that are planktonic for their entire life cycle.

Homocercal tail
A type of fish tal that is symmetrical in shape i.e. the upper and lower lobes are of similar size, as in most finifish.

Hookah (Diving System)
Is a diving system that delivers air to divers via hoses from a surface air compressor, rather than from scuba tanks (compressed air).

Humboldt Current (or Peru Current)
A cold ocean current flowing northwards along the western coast of South America.

The watertight body of a ship or boat.

High Water Mark

An instrument for determining the specific gravity of a liquid.

Hydrostatic skeleton
Maintenance of the shape of an organism by the filling of internal spaces with a liquid (usually water).

Hydrothermal vent
A fissure on the sea floor that continuously expels superheated, mineral-rich water that supports a diverse community of organisms.

Salinity well in excess of that of seawater.

Above-normal bone growth.

Low levels of oxygen, sub-optimal for supporting life.


Last modified: 11/09/2012 11:18 AM

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