4 Terms
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Fish farming
Of, or pertaining to the artificial mass cultivation of fish
Industry: Fishing
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Fish farming
Zeolite
Fishing; Fish farming
A naturally occurring ore which will absorb ammonia and soften water. It is only effective in fresh water.
Utilised stock, utilised population
Fishing; Fish farming
The part, by number, of the fish alive at a given time, which will be caught in future.
Venturi
Fishing; Fish farming
A type of valve which produces bubbles by drawing air into quickly flowing water. It is sometimes used on protein skimmers.
Vessel class
Fishing; Fish farming
Commercial fishing vessels are classified according to their gross registered tonnes (grt) of displacement. Vessels displacing less than 5 tonnes are not routinely monitored, and are referred to as ...
Virtual population analysis (VPA)
Fishing; Fish farming
An analysis of the catches from a given year class over its life in the fishery. If 10 fish from the 1968 year class were caught each year for 10 successive years from 1970 to 1979 (age 2 to age 11), ...
Wave maker
Fishing; Fish farming
A device which switches powerheads on and off at timed or random intervals, to simulate wave action in an aquarium.
Wet/dry philtre
Fishing; Fish farming
This is a form of biological filtration which has media exposed to the air to aid in nitrification. Common forms are trickle philtres and rotating "paddle wheel" filters.
