water column
Conceptual column representing the vertical section of a water body from surface to substrate.
Used in 124 profiles
Results for “water column”
Ichthyological terms, not general ones.
dither fish
Fish or group of fish, typically inhabiting open water in the mid-to-upper water column, used by aquarists to reduce innate shyness in other species.
Used in 65 profiles
pelagic egg
Egg floating freely in the water column. Sometimes buoyant.
pelagic phase
Period of time during the life cycle spent floating freely in the water column, usually as a larval constituent of plankton. Relatively common in marine fishes but also typical of amphidromous and diadromous species.
ultraviolet steriliser
Used to kill bacteria in the water column by exposing it to ultraviolet light.
vertical migration
Movement within the vertical plane of a water column.
fluidised bed filter
Type of biological filter comprising a vertical column within which sand or other fine-grained filter medium is held in suspension, i.e., a fluidised state, by a continual upward flow of water. The many fine grains of filter media provide a huge surface area for bacterial colonisation.