Tacking: Sailing into
the wind using a zig-zag motion to maintain
a forward course.
Tackle box: Box used
by fishers to keep tackle: hooks, sinkers,
line, lures, etc.
Tailings: Second grade
or waste rock fragments derived from screening
or processing or raw ores. Contaminate water
quality of streams and rivers.
Temperature: A measurement
of the degree of heat or cold of a body
on sea organisms that contain suckers or
stinging cells. Used to grasp food and move
Terrestrial: Of the land;
living on land.
Territory: Place where
an animal lives that it defends.
Test: An outer covering,
usually hard, secreted by some organisms
Testis: Male reproductive
organs that make sperm.
Tether: A long rope or
leash that attaches two things together.
The cable that attaches a submersible to
a ship is called a tether.
Thallus: The body of
Thermoclines: A zone
where the temperature drops rapidly as you
descend deeper into the water. You can feel
a thermocline if you dive down into a pool.
used to measure temperature.
Thorax: The chest region
of a vertebrate animal, or the central segment
of the body of an insect, crustacean or
Threatened species: Plant,
animal or micro-organism which may be common
in parts of its range but is severely depleted
Throat: Part of a fishing
handle on an outboard.
Thwarts: Seats of a boat.
Tidal: Between the tides.
Tidal channel: A channel
where water rises and falls with the tides.
Tidal current: Circulation
of water within coastal embayments caused
by changing tides.
Tide pool: A pool of
water left along the shore as the tide level
Tidal range: The amount
of change in an area's water level from
low to high tide.
Tidal zone: The area
in which the water moves in a tide.
Tide: Periodic rise and
fall of the surface of the ocean and connected
bodies of water resulting from the gravitational
attraction of the Moon and Sun.
Tilapia: A member of
a group of plant-eating freshwater fishes
native to Africa; they are easily raised
in ponds. If these fish are released into
natural waterways they can caused reduction
in native fish numbers.
Totem: An object or thing
in nature, often an animal, assumed as a
token or emblem of a clan, tribe, family
or related group.
Tourism: Occupation of
providing local services such as entertainment,
accommodation and catering for tourists.
Tours: Activity involving
taking tourists on a trip.
Toxic: A poison.
Trade winds: The air
masses moving from subtropical high-pressure
belts toward the equator; south-easterly
in the Southern Hemisphere.
Training logbook: Book
in which competencies are recorded.
Transect: An area of
land or seafloor sectioned off for particular
study purposes, usually in the form of a
long, continuous strip.
Transformer: A device
used to transfer electric energy from one
circuit to another.
Transom: The transverse
board or planking that forms the stern of
a square-ended boat. May have a cut-out
Transparent: Able to
be seen through.
Trawl: A sturdy bag or
net that can be dragged along the bottom
to catch fish or towed at various depths
above the bottom for the same purpose.
Trawler: A fishing boat
that tows a trawl net.
Trawling: Fishing by
towing a trawl net. Find out more about
trawling and see an animation of how it
works in Seafood Watch-Gear Types.
Trepang: Sea cucumber.
responsible for red tides.
Trickle filter: Homemade
filtration unit made from plastic scraps
and carry boxes.
Trolled: Dragging fishing
tackle over or just below the water.
Trophic: Relating to
processes of energy and nutrient transfer
from one or more organisms to others in
Trophic level: Position
in the food chain; determined by the number
of energy-transfer steps.
Trough: (wave) bottom
part of wave.
Trout: A member of a
group of long-bodied fishes related to salmon.
Trout have been important food fish for
people for centuries. Many trout species
live their entire lives in fresh water,
but some spend part of their lives in the
sea and return to rivers to spawn.
Tsunami: Large seismic
waves produced by earthquakes, volcanic
eruptions or underwater landslides (also
called tidal waves).
Tube feet: The small
projections underneath such animals as starfish
which provide them with locomotion.
Tubeworm: Any of a number
of species of marine worms or wormlike animals
that make a chimneylike tube to live in.
In some species the tubes are leathery,
in others hard and stony.
Tuna: A group of large,
sleek, predatory fishes that wander the
open oceans of the world. Many species of
tuna are important food fish for people.
Tunicate: Small, primitive
chordate animals that live attached to rocks
or to the seafloor. Many species of tunicate
live in the intertidal zone, and some, like
the predatory tunicate, live in the deep
sea. Some tunicates are called "sea squirts"
because they squirt water when disturbed.
Turbidity: The cloudy
conditions caused by the suspended solids
Turbidity currents: A
quick-moving mixture of water and sediments
that travels downslope, scouring the substrate
and depositing sediments as it goes.
Twilight zone: In the
ocean, the midwater zone of dim light that
lies between the sunlit zone and the completely
dark, deeper zone.