buoyancy force
40
and PI and P2 are densities, PI of the water considered, P2 of the surrounding
water). For objects with negative buoyancy one usually speaks of the underwater weight. Pelagic organisms are often capable of regulating their
buoyancy, which is called floating adaptation. Rapid changes in buoyancy can
be performed by the gas bladder of fish. Gas-filled spaces are also found in
various Mollusca (e.g., in the shells of Nautilus). An increase in buoyancy can
also be obtained when the body accumulates substances with a low specific
gravity. For this reason many marine species have a high fat content.
buoyancy force pressure force acting on a water element due to density differences with the surrounding water. Positive buoyancy means that the water is
lighter than the surrounding water, negative buoyancy means that it is heavier.
buoyancy frequency ~Brunt-Vaisala frequency.
by-catch the part of the catch that does not belong to the retained part of the
target species of a fishery. It includes the unmarketable component of the
target species, marketable species which were not aimed for, as well as accidental catches that are thrown overboard (discards). The term is often used
rather loosely.
byssal gland ~byssus.
byssus strong threads secreted by the byssal gland of mussels and other Bivalvia
and used to attach themselves to solid objects.
40
and PI and P2 are densities, PI of the water considered, P2 of the surrounding
water). For objects with negative buoyancy one usually speaks of the underwater weight. Pelagic organisms are often capable of regulating their
buoyancy, which is called floating adaptation. Rapid changes in buoyancy can
be performed by the gas bladder of fish. Gas-filled spaces are also found in
various Mollusca (e.g., in the shells of Nautilus). An increase in buoyancy can
also be obtained when the body accumulates substances with a low specific
gravity. For this reason many marine species have a high fat content.
buoyancy force pressure force acting on a water element due to density differences with the surrounding water. Positive buoyancy means that the water is
lighter than the surrounding water, negative buoyancy means that it is heavier.
buoyancy frequency ~Brunt-Vaisala frequency.
by-catch the part of the catch that does not belong to the retained part of the
target species of a fishery. It includes the unmarketable component of the
target species, marketable species which were not aimed for, as well as accidental catches that are thrown overboard (discards). The term is often used
rather loosely.
byssal gland ~byssus.
byssus strong threads secreted by the byssal gland of mussels and other Bivalvia
and used to attach themselves to solid objects.