47
catch curve
earth magnetism and electricity at sea. Magnetic surveys of ocean areas and
in magnetically unexplored regions were necessary for the construction of
more accurate sea maps and safer navigation. The seventh and last cruise,
started in 1928, included also exploration of the ocean bottom. James Percy
Ault was commander and chief of the scientific staff on most of the cruises.
He lost his life when the ship was totally destroyed during a gasoline explosion in western Samoa in 1929.
carnivores generally all animals that eat other animals; in food-chain studies
secondary consumers (those feeding on primary consumers i.e., secondary
producers or herbivores) and all animals in the higher trophic levels.
carnivorous meat-eating, ~carnivores.
carotene ~carotenoids.
carotenoids yellow, orange or red fat-soluble pigments. Almost all these molecules are based on the formula C 4o H s6 ' The carotenoids are usually classified
into carotenes, which are hydrocarbons, and xanthophylls, which are oxygenetic derivatives of carotene. Carotenoids absorb light in the region of 400 to
550 nm. A very common xanthophyll is fucoxanthin, which is found in
diatoms in such quantities that these organisms are not green but brown.
carrying capacity the maximum population size (density of an organism) possible
in an ecosystem, beyond which the density cannot increase because of environmental resistance.
cast in oceanography a cast is a series of water samplers lowered on one line,
to obtain (roughly) simultaneously water samples at different depths.
catabolism ~metabolism.
catadromous (or katadromous) downward running, term used to indicate fish
species of freshwater that make spawning migrations to the sea, such as, e.g.,
the anguilliformes or eels; opposite of anadromous.
catchability (q) the fraction of a fish stock which is caught by a defined unit of
fishing effort, according to the equation: fishing mortality rate = q x effort. A measure of the relative ability of vessel-gear combinations to catch a particular
species of fish per unit time. Also, the proportion of the total amount of a
fish species per unit area that ends up in the catch fishing that area.
catch curve the logarithmic graph of the numbers of fish taken at successive ages
or sizes, the slope of which presents an estimate of (apparent) mortality.
catch curve
earth magnetism and electricity at sea. Magnetic surveys of ocean areas and
in magnetically unexplored regions were necessary for the construction of
more accurate sea maps and safer navigation. The seventh and last cruise,
started in 1928, included also exploration of the ocean bottom. James Percy
Ault was commander and chief of the scientific staff on most of the cruises.
He lost his life when the ship was totally destroyed during a gasoline explosion in western Samoa in 1929.
carnivores generally all animals that eat other animals; in food-chain studies
secondary consumers (those feeding on primary consumers i.e., secondary
producers or herbivores) and all animals in the higher trophic levels.
carnivorous meat-eating, ~carnivores.
carotene ~carotenoids.
carotenoids yellow, orange or red fat-soluble pigments. Almost all these molecules are based on the formula C 4o H s6 ' The carotenoids are usually classified
into carotenes, which are hydrocarbons, and xanthophylls, which are oxygenetic derivatives of carotene. Carotenoids absorb light in the region of 400 to
550 nm. A very common xanthophyll is fucoxanthin, which is found in
diatoms in such quantities that these organisms are not green but brown.
carrying capacity the maximum population size (density of an organism) possible
in an ecosystem, beyond which the density cannot increase because of environmental resistance.
cast in oceanography a cast is a series of water samplers lowered on one line,
to obtain (roughly) simultaneously water samples at different depths.
catabolism ~metabolism.
catadromous (or katadromous) downward running, term used to indicate fish
species of freshwater that make spawning migrations to the sea, such as, e.g.,
the anguilliformes or eels; opposite of anadromous.
catchability (q) the fraction of a fish stock which is caught by a defined unit of
fishing effort, according to the equation: fishing mortality rate = q x effort. A measure of the relative ability of vessel-gear combinations to catch a particular
species of fish per unit time. Also, the proportion of the total amount of a
fish species per unit area that ends up in the catch fishing that area.
catch curve the logarithmic graph of the numbers of fish taken at successive ages
or sizes, the slope of which presents an estimate of (apparent) mortality.