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Information about Long Line Fishing

For other meanings of "longline", see longline.
Long-line fishing is a commercial fishing technique that uses hundreds or even thousands of baited hooks hanging from a single line. Swordfish, tuna, halibut, sablefish and Patagonian toothfish are commonly caught by this method. In some unstable fisheries such as that of Patagonian toothfish in New Zealand, fishermen may be limited to as few as 25 hooks on a line. In contrast, large commercial long-liners in certain robust fisheries of the Bering Sea and North Pacific generally run over 2500 hand-baited hooks on a single series of connected lines many miles in length. Long-lines can be set to hang near the surface (pelagic longline) to catch fish such as tuna and swordfish or along the sea floor (Demersal longline) for groundfish such as halibut or cod. Pelagic longlines are the most common commercial fishing gear in the world.

Long-line fishing is controversial in some areas because of by-catch. Methods to mitigate such incidental mortality have been developed and successfully implemented in some fisheries. These include the use of weights to ensure the lines sink quickly, the deployment of streamer lines to scare birds away from the baited hooks as they are deployed, setting lines only at night with ship lighting kept low (to avoid attracting birds), limiting fishing seasons to the southern winter (when most seabirds are not feeding young), and not discharging offal while setting lines. However, gear modifications do not eliminate by-catch of many species and the controversy continues. In March 2006, the Hawaii long-line swordfish fishing season was closed due to excessive loggerhead sea turtle by-catch after being open only a few months, despite using modified circle hooks which attempt to reduce by-catch.

These issues aside, long-lining is one of the most efficient methods of commercial fishing. The impact on marine habitats of long-lining is far less than that of trawling or dredging as the line is not dragged along the sea floor. Particularly in the US and Canada, fisheries are under close management and long-lines are regulated with an eye towards ecological sustainability.

References

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Longline can mean:-
  • Long-line fishing
  • Long line (topology)
  • Long line (telecommunications)
  • Aerial crane, i.e. using a helicopter to lift a heavy object

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Fishing is the activity of hunting for fish by hooking, trapping, or gathering. By extension, the term fishing is applied to pursuing other aquatic animals such as various types of shellfish, squid, octopus, turtles, frogs, and some edible marine invertebrates.
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Xiphiidae

Genus: Xiphias

Species: X. gladius

Binomial name
Xiphias gladius
Linnaeus, 1758


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Tuna are several species of ocean-dwelling fish in the family Scombridae, mostly in the genus Thunnus. Some tuna are able to inhabit freshwater environs as well. Tunas are fast swimmers—they have been clocked at 77 km/h (48 mph)—and include several species that
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halibut is a type of flatfish from the family of the righteye flounders (Pleuronectidae). This name is derived from Dutch heilbot. Halibut live in both the North Pacific and the North Atlantic oceans and are highly regarded food fish.
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Anoplopoma

Species: A. fimbria

Binomial name
Anoplopoma fimbria
Pallas, 1814

The sablefish, Anoplopoma fimbria
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Dissostichus

Species: D. eleginoides

Binomial name
Dissostichus eleginoides
Smitt, 1898

The Patagonian Toothfish (
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Anthem
"God Defend New Zealand"
"God Save the Queen" 1


Capital Wellington

Largest city Auckland
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The pelagic zone is the part of the open sea or ocean that is not near the coast. In contrast, the neritic zone comprises the water that is near to (and is significantly affected by) the coast or the continental shelf.
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COD may refer to many different topics, including:
  • Cash on delivery
  • Completion of discharge, shipping
  • College of DuPage, a public Junior College with campuses in the suburbs of Chicago
  • Call of Duty (series), a series of computer games

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by-catch includes species caught in a fishery intended to target another species, as well as reproductively-immature juveniles of the target species. OECD (1997) defines bycatch as
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State of Hawaii
Mokuʻāina o Hawaiʻi

Flag of Hawaii Seal of Hawaii
Nickname(s): The Aloha State

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Caretta
Rafinesque, 1814

Species: C. caretta

Binomial name
Caretta caretta
Linnaeus, 1758

The Loggerhead Sea Turtle (
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Trawling is a method of fishing that involves actively pulling a fishing net through the water behind one or more boats, called trawlers. |

Net structure

When two boats are used (pair trawling), the horizontal spread of the net is provided by the boats, with one
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Dredging is the repositioning of soil from a marine environment, using specialized equipment, in order to initiate infrastructural and/or ecological improvements. In this definition "repositioning" stands for the process of (1) removal, (2) transport, (3) placement and often (4)
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