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Pests and Threats Glossary  

Algae – simple plants that range from microscopic single cells to massive seaweeds. Most algae live in water.

Algal bloom – an explosion in the number of floating microscopic algae.

Antifouling – refers to paint and other products used on the hulls of ships, boats and other marine structures. These products slow down the growth of marine organisms on these surfaces.

Aquaculture – Growing food in the sea or freshwater habitats.

Biofouling  - plants and animals growing over the surfaces of equipment and structures eg ship hulls, piers.

Ballast water – On ships, water is stored in special tanks to keep the ship balanced when cargo is moved around.

Codes of conduct – a set of rules or accepted actions.

Dinoflagulates – a group of single celled microscopic algae (plants) that live in water including the sea.

Electrolytic device – a method to break down the chemical bonds between the ship’s hull and marine organisms using electrical charge.

Exotic – a species introduced into an environment where it does not belong. (the word feral is also used in the same way)

Fisheries – a species of fish or other commercial marine animal, their population and life cycle within a region of the sea.

Food web – How plants, animals and bacteria in an ecosystem relate to each other as some produce food from the sun and others get their energy from consuming other organisms.

Hull fouling - plants and animals growing over a boat or ship’s hull.

Larvae – tiny young of some invertebrate animals. In the sea they float freely, often trying to find a home.

IMO – the International Maritime Organization is a specialized agency of the United Nations responsible for the maritime safety of ships and crew and the protection of the marine environment from shipping activities.

International convention – an agreement between countries on what they will do about particular issues.

Marpol 73/78 Convention – an agreement between countries on accepted practices and ways to control pollution from ships.

Sea chest – a grid covering an opening below the waterline of the hull where seawater can be pumped into a ship’s ballast tanks.

TBT – TBT is short for Tributyltin, a chemical used in many antifouling paints to reduce the fouling of ships’ hulls.

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