Fishing effort measurement
(PDF)
Table on fishing effort1 measurement/Table sur la mesure de l’effort de pêche (Rome, 2007)
Gear | Number and dimension | Capacity | Activity | Nominal Effort2 |
Dredge (for molluscs) | Open mouth
Width of mouth | GT | Time fishing | Dredged bottom surface3 |
Trawl (including dredges for flatfishes) | Type of trawl (pelagic,
bottom)
GT and/or GRT
Engine power
Mesh size
Size of the net (width of mouth)
Speed | GT | Time
Fishing | GT*days
GT*hours
KW*days |
Purse seine | Length and drop of the net
GT
Light power
Number of small boats | GT
Length and drop of the
net | Search
time
Set | GT * Fishing sets2
Length of the net *
fishing sets |
Nets | Type of net (e.g.trammel net,
gillnets, etc.)
Net length (used in
regulations)
GT
Net surface
Mesh size | Net length and drop | Time
fishing | Net length * days
Surface*days |
Long lines | Number of hooks
GT
Number of longline
Characteristics of hooks
Bait
| Number of
hooks
Number of
longline unit | Time
fishing | Number of hooks *
hours
Number of hooks * days
Number of longline
units * days/hours |
Traps | GT | Number of
traps | Time
fishing | Number of traps * days |
Purse
seine/FADs | Number of FADs | Number of FADs | Number of
trips | Number of FADs *
Number of trip |
1 It refers to nominal effort.
2 Should be referred to a particular area (indicating the surface) to estimate fishing intensity (effort ? km
-2) and to relate the effort to exploited communities.
3 The effort measures that do not include a time activity should be referred to a period of time (i.e. by year).
