Trawling can be carried out by one trawler or by two trawlers fishing cooperatively ( pair trawling ).

When the turbidity plumes from bottom trawlers are below a thermocline, the surface may not be impacted, but less visible impacts can still occur, such as persistent organic pollutant transfer into the pelagic food chain.

In a few hours, massive nets weighing up to 15 tons, dragged along the bottom by deep-water trawlers, can destroy deep-sea corals and sponge beds that have taken centuries or millennia to grow.

The trawlers can target orange roughy, grenadiers, or sharks.

Usually otter trawlers have the superstructure forward, though it can be aft or amidship.

Pelagic trawlers can use fish pumps to empty the cod end.

Pelagic trawlers can have fish pumps to empty the codend.

They can work alone when midwater or bottom trawling, or two can work together as pair trawlers.

The last deep sea trawler left the town in 1982 and now only inshore fishing boats fish out of the port, although trawlers registered in other places can still be seen taking advantage of the fish market.

Bottom trawling can be carried out by one trawler or by two trawlers fishing cooperatively ( pair trawling ).

Some boat-building still takes place in Polruan: Toms's Yard builds and repairs boats and has reputation for handling trawlers and also for hand building in wood.

Fishing trawlers still grace the small harbor, bringing in a catch of shrimp, crab or perhaps flounder depending on the season.

Some side trawlers still in use have been equipped with net drums.

Adult specimens are also found in the nets of fishing trawlers, and are still consumed by indigenous peoples across its range.

** Cod War: British Foreign Secretary Sir Alec Douglas-Home says that Royal Navy ships will be stationed to protect British trawlers off Iceland.

CIRVA is recommending that this reserve be extended southwards to cover the full known area of the Vaquita's range and that trawlers be completely banned from the reserve area.

This would indicate both, the aircraft's capability of extended flight and pilots ' intention to water land near the only point where rescue would be feasible ; the committee claims a lack of bodies, body parts and tissues, and luggage, both on the surface of the sea and at the bottom ; the Soviet obstruction of U. S., Korean, and Japanese search vessels trying to enter into Soviet territorial waters around Moneron Island, near which KAL 007 was last tracked spiraling downward ; Russian Federation released previously unknown Soviet transcripts of mission orders within one half hour of the shootdown, sending helicopters, KGB patrol boats, and civilian trawlers to Moneron Island ; and the Russian Federation acknowledgement of Soviet deception in its part of the search for KAL 007, all indicate a Soviet recovery of passengers and crew from the damaged and downed passenger jet.

During World War I and World War II, many fishing trawlers were commissioned as naval trawlers to be used as minesweepers, the activities being similar, with the crew and layout already suited to the task.

During the Cold War, some countries fitted fishing trawlers with additional electronic gear so they could be used as spy ships to monitor the activities of other countries.

The town of Grimsby on Lincolnshire's east coast once laid claim to the title of the ' largest fishing port in the world ', Its fleet of over 700 trawlers and the rail links from the town to London's Billingsgate Fish Market allowed Grimsby fish to be renowned nationwide.

Despite the availability of steam, trawling under sail continued to be economically efficient, and sailing trawlers continued to be built until the middle of the 1920s.

Also observers will be required on all high seas bottom trawlers to ensure enforcement of the regulations.

Using more reliable figures based on those animals seen during surveys, there may be only 2 – 11 million individuals available to trawlers, and the annual catch may remove 12 %– 28 % of that population.

Naval trawlers masquerade as civilian ships such as fishing trawlers, which could be reasonably expected to remain in a certain area for a long time.

With a second stage of development planned that would have seen the inner sea loch converted into a harbour to accommodate 200 + trawlers, fitted with a sea lock to ensure a constant depth, Leverhulme paid for upgraded roads to accommodate the additional traffic.

As the 13th Submarine Flotilla passed the island, a pair of lights ( possibly minesweeping naval trawlers ) were seen approaching the line of submarines.

There is always a great deal of activity on the water, including frequent warship movements, ferries going and coming from France and Spain, fishing trawlers and a swarm of larger and smaller sailing boats.

Tropical shrimp trawlers often make trips of several months without coming to port.

As of 2010, at least twelve " live aboard " boats — mostly converted trawlers with bunk rooms in their former holds — take recreational divers out to the main sites, primarily from the main harbour at Stromness.

Fishermen of the RNR ( T ) section served with distinction onboard trawlers fitted out as minesweepers for mine clearance operations at home and abroad throughout the war where they suffered heavy casualties and losses.

He travelled all over the North Atlantic to produce a landmark Green Paper on Fisheries .< ref name = Conservatives_profile > Paterson joined the crew of the Kiroan, one of the few remaining trawlers out of Fleetwood, Lancashire, to view the fishing practices which have been created by the EU's Common Fisheries Policy.

Also, many trawlers carry out some measure of onboard fish processing, and the larger the vessel, the more likely it is to include fish processing facilities.

Mine sweeping naval trawlers were sent out to counter this threat and two old cruisers were modified to act as repair workshops and headquarters for this flotilla.

During the 1950s to the 1970s, the domestic and foreign fishing fleets became increasingly industrialized, with massive factory freezer trawlers fishing out of Newfoundland ports – foreign fleets were based in Newfoundland and could fish 12 NM offshore, while domestic fleets could fish in both the territorial sea and the offshore.

The rescues carried out over the years by 202 Squadron have included a wide variety of incidents involving rescuing casualties from aircraft, fishing trawlers, ferries, oil rigs, mountainous terrain, cliffs and the waters surrounding Scotland.

Surviving weapons were brought out of storage to see service in World War II, mainly on board ships such as naval trawlers, Motor Boats and " armed yachts ".

The town is hilly, and built around the harbour which remains in use as a dock for fishing trawlers.

Killybegs is the most important fishing port in Ireland, and its harbour is often full with trawlers.

The harbour is home to all the largest Irish midwater pelagic trawlers, and a modest whitefish fleet, but it handles many other types of shipping as well.

The Royal Pakistan Navy secured two sloops, two frigates, four minesweepers, two naval trawlers, four harbor launches and some 358 personnel ( 180 officers and 34 ratings ) and was given a number of harbour defence motor launches.

The committee allocated to the newly-formed ' Royal Pakistan Navy ' ( RPN ) three of the seven active sloops,, and, four of the ten serviceable minesweepers, two frigates, two naval trawlers, four harbour launches and a number of harbour defence motor launches.

The shot shows a mixture of seine net and trawlers in the harbour.