 | FAO/FIIT Fishing Gear Type Fact-Sheet |
|
| Lift nets [LN] | updated : 10-mai-2001 |
|
|
|
| Profile |
| General Description: Lift nets are horizontal netting panels
or bag shaped like a parallelepiped, pyramid or cone with
the opening facing upwards which are submerged at a certain
depth, left for a while, the time necessary for light or
bait to attract fish over the opening, then lifted out of
the water. Three main type of lift nets can be
distinguished: portable hand lift
nets, boat-operated lift nets (used, in
general, with light attraction),shore or shallow
water-operated lift nets. |
| Specific Handling Equipment: Lift nets are hauled out by hand or
mechanically through bomm(s) and blocks. The handling
(setting and hauling) of large lift nets, normally requires,
in addition, one or severalwinches. |
| Fishing Vessels using this gear: Boat-operated lift nets are often used, in
small-scale fisheries, from small catamans (e.g. in inland
fisheries, in Africa) or twocanoes operating
together; other models of lift nets, larger (i.e. bag
nets, "basnig", in Asia) are handled, from
large vessels, known as
liftnetters. In some other
cases no boats are required (for shore stationary installations).
|
| Fishing Operations: The operations, from the shore, from a
canoe or a bigger boat, include - the setting of the net at
a certain depth, opening facing upwards; - the attraction of
the fish over the above mentioned opening, by light or bait;
then, - the lifting/hauling of the net out of the water, by
hand or mechanically. |
|
| Features |
| Target Species: Small pelagic species, fish
andsquid
|
| The Gear and its Environment:
It is also worth mentioning in respect to the
use of light attraction with lift nets for squid fishing,
that, in far east Asia, with the steep increasing of the
power of lights, a decrease of the effectiveness of each
individual liftnetter fishing in fleets, no so far one to
each other, has been observed. |
 | Deployment Area: Lift nets are, in general, active a
few meters below the surface; when light attraction is
used, the active depth depends on the attraction power
of the light; this differs much if lamps (one or
several) are above the surface or if under-water lamps
are used; with the former, the power of the lamp and the
number of these is the criteria; with the later, things
depend on the length of the under-water power cable to
the lamps); either in sea and inland waters. |
| Impact on Aquatic Species: The impact of the use of lift nets
depends on how selective is the attraction above the
lift net opening, mainly attraction to the light.
Certain species or smaller sizes of fish can be
attracted, at the same time, in addition to target
species (a bycatch which is some time discarded). |
|
|
