colloid. 1  a solid, liquid, or gaseous substance made up of very small, insoluble particles (as single large molecules or masses of smaller molecules) that remain in suspension in a surrounding solid, liquid, or gaseous medium of different matter.
Nekton. Nekton are the animals that can move by themselves in the ocean waters. Nekton live in all zones of the ocean. However, just like benthos and plankton, most live in the sunlight zone or shallow twilight zone since there is the most sunlight and it is easy to feed on smaller organisms such as krill and minnows.
This zone is also marked by very low temperatures (5 or 6 degrees Celsius) and having a very low organismal biomass, a trend that will continue until reaching the ocean floor. The boundary between the mesopelagic zone and the bathypelagic zone contains The Deep Scattering layer â a layer of fish, squid, crustaceans etc, that migrate each day from the deep ocean to the shallows at night.