EEZ= Exclusive Economic Zone = Federal water from 3 to 200 nautical miles offshore.
Fisheries in the EEZ are generally under federal Control
M = Natural mortality (M) -
The instantaneous rate at which fish die from all causes other
than harvest. This rate has traditionally included unmeasured
bycatch mortality, but as research has documented bycatch, it
is increasingly included in "F". Usually "M" is an assumption
or estimate from maximum age data or the value used for other
species with a similar life history strategy. Natural
mortality can rarely be measured directly.
MRFSS = Marine Recreational Fisheries Statistics Survey
MSP = Maximum spawning potential = The
estimated female spawning stock biomass or egg production in
the absence of fishing. A percentage of this value (% MSP) can
be used as a measure of the health of a stock.
MSY = Maximum sustainable yield = The largest
catch, on average, which can be taken from a stock over time
under existing environmental conditions without affecting the
reproductive capacity of the stock.
MT = Metric Ton = 2,204.6 pounds
Recruit = An individual fish which has entered
a defined group through growth,spawning, or migration, such as
those fish above minimum legal size ( fishable stock) or which
are sexually mature ( spawning stock).
Recruitment = A measure of weight or number of fish
which enter a defined portion of a stock, such as fishable
stock or the spawning stock.
SPR = Spawning potential ratio = SPR compares the spawning ability
of a stock in the fished condition to the stockís spawning
ability in the unfished condition
SSB = Spawning stock biomass = total weight of
fish which are sexually mature; generally pertaining only to
TAC = Total allowable catch
Threshold = that point where the fishery is
regarded as overfished
Target Values = that value or below which allows
the fishery to be self sustaining
Biomass = The total weight of a stock of fish or of
a defined subunit of a stock, such as spawning females (SSB)
Bycatch = That portion of a catch taken
incidentally to the targeted catch because of non-selectivity
of fishing gear to either species or size differences. Some by
catch may be retained, but most is usually discarded
CPUE = C/E = The catch taken by a given amount of
fishing gear during a given period of time. Over time, CPUE
data often provides an indication of trends in abundance in a
Coastal Pelagic = Fish that migrate along the
coast, generally near shore, and live in the water column
rather than in association with the bottom.
Demersal = Refers to organisms which live at or
near the bottom, but not in (Benthic) the bottom
Estuary = A coastal area landward of the
ocean beach where freshwater and saltwater mix. Estuaries are
among the most biologically productive and environmentally
ITQ = Individual transferable quota + A form of
controlled access in which individual persons or vessels
receive a property right to a share or specific allocation of
the total expected harvest of fish which they can buy, sell,
Mortality rate = the rate at which fish
die. Mortality can be expressed as annual percentages or
instantaneous rates (the fraction of the stock which dies
within each small amount of time). Fishery scientists utilize
several different types of mortality to evaluate status of
fish stocks, and some serve as biological reference points
(Instantaneous rates are used in most stock assessments)
A = Annual mortality = the percentage of a fish stock
which dies from all causes during a year.
Fishing mortality (F) = A measurement of the
rate of removal of fish from a population by fishing. Fishing
mortality can be reported as either annual or instantaneous.
Annual mortality is the percentage of fish dying in one year.
Instantaneous is that percentage of fish dying at ny one time.
The acceptable rates of fishing mortality may vary from
species to species. There are several kinds of fishing
mortality rates; some of the more common include the
F max = The rate of fishing mortality which maximizes the weight
taken from a single cohort* over its entire life. (* a group of fish spawned during a given period, usually in a single year)
F msy = The rate of fishing mortality, which maximizes the weight of the harvest
within a year.
F 0,1 = The rate of fishing mortality at which an increase in
catch for a given increase in effort is only 10% of what it would be from an unfished stock.
Z = Total instantaneous mortality = The sum of fishing F and natural mortality M