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Definitions (54)
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data deficient
Presumed to be at some risk of extinction, but there is inadequate information to make a direct, or indirect assessment of this risk based on its distribution and/or population status (IUCN definition).
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reproductive capacity
A measure of a stock’s ability to maintain its SSB at a level below which recruitment will decline substantially. RC is determined by comparing the SSB to the biomass limit reference point (Blim) and the biomass precautionary approach reference point (Bpa).
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aquaculture
Cultivation or farming of any aquatic species – marine or freshwater, plant or animal.
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beam trawl
A type of bottom trawl in which the horizontal opening of the net is provided by a heavy beam mounted at each end on guides or skids which travel along the seabed. On sandy or muddy bottoms, a series of ‘tickler’ chains are strung between the skids ahead of the net to stir up the fish from the seabed and chase them into the net. On rocky grounds, t [..]
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benthic
Bottom-dwelling.
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biomass
The total weight of a group (or stock) of living organisms or of some defined fraction of it (e.g. spawners), in a given area, at a particular time.
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bmsy
Biomass corresponding to maximum sustainable yield (MSY). Often used as a biological reference point in fisheries management, it is the long-term average biomass expected if fishing at the rate of FMSY (see Fishing mortality).
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bottom trawl
A trawl designed to work at the sea bottom. The lower edge of the net opening drags along the seabed, and is normally protected by a thick ground rope and ballasted with chains, sinkers, rubber discs, bobbins, etc. Bottom trawls include low-opening trawls for demersal species such as beam trawls and shrimp trawls, and high-opening demersal otter tr [..]
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brood stock
Eggs, juveniles or adults of a species, from which a first or subsequent generation may be produced in captivity, whether for growing in aquaculture or for release to the wild for stock enhancement.
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bycatch
The part of a catch other than the adults of the target species, which is taken incidentally. Some or all of it may be returned to the sea as discards, usually dead or dying.
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