Afishing trawler is a commercialfishing vessel designed to operatefishing trawls. Trawling is a method of fishing that involves actively dragging or pulling a trawl through the water behind one or more trawlers. Trawls arefishing nets that are pulled along the bottom of the sea or in midwater at a specified depth. A trawler may also operate two or more trawl nets simultaneously (double-rig and multi-rig).
There are many variants of trawling gear. They vary according to local traditions, bottom conditions, and how large and powerful the trawling boats are. A trawling boat can be a small open boat with only 30 horsepower (22 kW) or a largefactory ship with 10,000 horsepower (7457 kW). Trawl variants include beam trawls, large-opening midwater trawls, and large bottom trawls, such as "rock hoppers" that are rigged with heavy rubber wheels that let the net crawl over rocky bottom.
The 17th century saw the development of an early type of sailing trawler called aDogger, which commonly operated in theNorth Sea. It takes its name from an earlier type of the same name, and from the area fished. The word is theDutch word forcodfish (dogge), but has come to mean a fishing vessel which tows atrawl.[4] Doggers were slow but sturdy, capable of fishing in the rough conditions of the North Sea.[5]
The modern fishing trawler was developed in the 19th century, at the English fishing port ofBrixham. By the early 19th century, the fishermen at Brixham needed to expand their fishing area further than ever before due to the ongoing depletion of stocks that was occurring in theoverfished waters ofSouth Devon. TheBrixham trawler that evolved there was of a sleek build and had a tallgaff rig, which gave the vessel sufficient speed to make long-distance trips out to the fishing grounds in the ocean. They were also sufficiently robust to be able to tow large trawls in deep water. The great trawling fleet that built up at Brixham earned the village the title of 'Mother of Deep-Sea Fisheries'.
This revolutionary design made large scale trawling in the ocean possible for the first time, resulting in a substantial migration of fishermen from the ports in the South of England, to villages further north, such asScarborough,Hull,Grimsby,Harwich andYarmouth, that were points of access to the large fishing grounds in theAtlantic Ocean. The small village ofGrimsby grew to become the 'largest fishing port in the world'[6] by the mid 19th century. With the tremendous expansion in the fishing industry, theGrimsby Dock Company was opened in 1854 as the first modern fishing port.[7] The facilities incorporated many innovations of the time – the dock gates and cranes were operated byhydraulic power, and the 300-foot (91 m)Grimsby Dock Tower was built to provide a head of water with sufficient pressure byWilliam Armstrong.[8]
The elegantBrixham trawler spread across the world, influencing fishing fleets everywhere.[9][10] By the end of the 19th century, there were over 3,000 fishing trawlers in commission in Britain, with almost 1,000 at Grimsby. These trawlers were sold to fishermen around Europe, including from theNetherlands andScandinavia. Twelve trawlers went on to form the nucleus of the German fishing fleet.[11]
The earliest steam-powered fishing boats first appeared in the 1870s and used thetrawl system of fishing as well as lines and drift nets. These were large boats, usually 80–90 feet (24–27 m) in length with a beam of around 20 feet (6.1 m). They weighed 40–50 tons and travelled at 9–11 knots (17–20 km/h; 10–13 mph).
The earliest purpose-built fishing vessels were designed and made by David Allan inLeith in March 1875, when he converted a drifter to steam power. In 1877, he built the firstscrew-propelledsteam trawler in the world. This vessel wasPioneer LH854. She was of wooden construction with two masts and carried a gaff-rigged main and mizen using booms, and a single foresail. Allan argued that his motivation for steam power was to increase the safety of fishermen. However local fishermen saw power trawling as a threat. Allan built a total of ten boats atLeith between 1877 and 1881. Twenty-one boats were completed atGranton, his last vessel beingDegrave in 1886. Most of these were sold to foreign owners inFrance,Belgium,Spain and theWest Indies.[12]
The firststeam boats were made of wood, butsteelhulls were soon introduced and were divided intowatertight compartments. They were well designed for the crew with a large building that contained thewheelhouse and thedeckhouse. The boats built in the 20th century only had amizzensail, which was used to help steady the boat when its nets were out. The main function of the mast was now as acrane for lifting the catch ashore. It also had a steamcapstan on theforedeck near the mast for haulingnets. These boats had a crew of twelve made up of askipper, driver, fireman (to look after the boiler) and nine deck hands.[12]
Steam fishing boats had many advantages. They were usually about 20 ft longer (6.1 m) than the sailing vessels so they could carry more nets and catch more fish. This was important, as the market was growing quickly at the beginning of the 20th century. They could travel faster and further and with greater freedom fromweather, wind andtide. Because less time was spent travelling to and from the fishing grounds, more time could be spent fishing. The steam boats also gained the highest prices for their fish, as they could return quickly to harbour with their fresh catch.[12]
Steam trawlers were introduced atGrimsby andHull in the 1880s. In 1890 it was estimated that there were 20,000 men on the North Sea. The steam drifter was not used in the herring fishery until 1897. The last sailing fishing trawler was built in 1925 in Grimsby.
Trawler designs adapted as the way they were powered changed from sail to coal-fired steam byWorld War I todiesel andturbines by the end ofWorld War II.
The first trawlers fished over the side, rather than over thestern. In 1947, the companyChristian Salvesen, based inLeith, Scotland, refitted a surplusAlgerine-class minesweeper (HMSFelicity) with refrigeration equipment and a factory ship stern ramp, to produce the first combined freezer/stern trawler in 1947.[13]
The first purpose-built stern trawler wasFairtry built in 1953 atAberdeen. The ship was much larger than any other trawlers then in operation and inaugurated the era of the 'super trawler'. As the ship pulled its nets over the stern, it could lift out a much greater haul of up to 60 tonnes.Lord Nelson followed in 1961, installed with vertical plate freezers that had been researched and built at theTorry Research Station. These ships served as a basis for the expansion of 'super trawlers' around the world in the following decades.[13]
Since World War II, commercial fishing vessels have been increasingly equipped with electronic aids, such asradio navigation aids andfish finders. During theCold War, some countries fitted fishing trawlers with additional electronic gear so they could be used asspy ships to monitor the activities of other countries.
Modern trawlers are usuallydecked vessels designed for robustness. Theirsuperstructure (wheelhouse and accommodation) can be forward, midship or aft. Motorisedwinches,electronic navigation andsonar systems are usually installed. Fishing equipment varies in sophistication depending on the size of the vessel and the technology used. Design features for modern fishing trawlers vary substantially, as many national maritime jurisdictions do not impose compulsory vessel inspection standards for smaller commercial fishing vessels.[14][15]
Mechanised hauling devices are used on modern trawlers. Trawl winches, such as Gilson winches, net drums[16] and other auxiliary winches are installed on deck to control the towing warps (trawling wires) and store them when not in use.
Modern trawlers make extensive use of contemporary electronics, including navigation and communication equipment, fish detection devices, and equipment to control and monitor gear. Just which equipment will be installed depends on the size and type of the trawler.
Much of this equipment can be controlled from the wheelhouse or bridge. Smaller trawlers have wheelhouses, where electronic equipment for navigation, communications, fish detection and trawl sensors are typically arranged about the skipper's chair. Larger vessels have a bridge, with a command console at the centre and a further co-pilot chair. Modern consoles display all the key information on an integrated display. Less frequently used sensors and monitors may be mounted on thedeckhead.[17]
Navigational instruments, such as anautopilot andGNSS, are used for manoeuvring the vessel in harbour and at sea. Radar can be used, for example, when pair trawling to keep the correct distance between the two vessels. Communication instruments range from basic radio devices tomaritime distress systems andEPIRBs, as well as devices for communicating with the crew.Fish detection devices, such asechosounders andsonar, are used to locate fish.[17]
During trawling operations, a range of trawl sensors may be used to assist with controlling and monitoring gear. These are often referred to as "trawl monitoring systems" or "net mensuration systems".
Modern trawlers store the fish they catch in some form of chilled condition. At the least, the fish will be stored in boxes covered with ice or stored with ice in the fish hold. In general, the fish are kept fresh by chilling them with ice or refrigerated sea water, or freezing them in blocks. Also, many trawlers carry out some measure of onboardfish processing, and the larger the vessel, the more likely it is to include fish processing facilities. For example, the catch can undergo some preliminary processing by being passed through sorting and washing devices. At a further stage, the fish might bemechanically gutted and filleted. Factory trawlers may processfish oil andfish meal and may include canning plants.
Crew quarters are usually below the wheelhouse and may includebunks, withcot sides to stop the occupant from rolling out in heavy weather. The need for drying sea clothes is shown by a notice in at least one steam trawler'sboiler room saying "Do not dryoil frocks over the boiler".[18]
Trawlers can be classified by their architecture, the type of fish they catch, the fishing method used, or geographical origin. The classification used below follows theFAO, who classify trawlers by the gear they use.[19]
Outrigger trawlers useoutriggers, or booms, to tow thetrawl. These outriggers are usually fastened to, or at the foot of the mast and extend out over the sides of the vessel during fishing operations. Each side can deploy a twin trawl or a single otter trawl. Outrigger trawlers may have the superstructure forward or aft. Warp winches withcapstans are installed on the deck to haul the catch.
Outrigger trawlers use verticalfish finders of different kinds, according to their size.[20]Drawing (FAO)Archived 2015-09-24 at theWayback Machine
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 A drawing of a beam trawler |
Beam trawlers are a type of outrigger trawler (above), with the superstructure aft and the working deck amidships. They use a very strong outrigger boom on each side, each towing abeam trawl, with the warps going through blocks at the end of the boom. This arrangement makes it easier to stow and handle the large beams. The outriggers are controlled from a midship A-frame or mast. The towing winch is forward of the superstructure, with the towing warps passed through deck bollards and then out to the towing blocks on the booms.
Beam trawling is used in theflatfish fisheries in theNorth Sea. They are equipped with equipment for hauling the net and stowing it aboard. Typically an multibeam echosounder is used for finding fish.
They are medium-sized and high-powered vessels, towing gear at speeds up to 8knots. To avoid the boat capsizing if the trawl snags on the sea floor, winch brakes can be installed, along with safety release systems in the boom stays. The engine power of bottom trawlers is restricted to 2000 HP (1472 kW) for further safety.[21]
Otter trawlers deploy one or more parallel trawls kept apart horizontally usingotter boards. These trawls can be towed in midwater or along the bottom. Otter trawlers range in size from sailing canoes to supertrawlers.[22]
Otter trawlers usually have two gallows at the stern with towing blocks. The towing warps run through these, each regulated by its own winch. Medium and large trawlers usually have a stern ramp for hauling the trawl onto the deck. Some trawlers tow twin parallel trawls, using three warps, each warp with its own winch. Some otter trawlers are also outrigger trawlers (above), using outriggers to tow one or two otter trawls from each side.[22]
Usually otter trawlers have the superstructure forward, though it can be aft or amidship. Gallows are on the stern quarters or there is a stern gantry for operating the otter boards.Pelagic trawlers can use fish pumps to empty thecod end.[22]
Pair trawlers are trawlers which operate together towing a single trawl. They keep the trawl open horizontally by keeping their distance when towing. Otter boards are not used. Pair trawlers operate both midwater and bottom trawls.[23]
The superstructure is forward or midships and the working deck aft. Pelagic trawlers can have fish pumps to empty the codend.[23]
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Side trawlers have the trawl deployed over the side with the trawl warps passing through blocks suspended from a forward gallow and an aft gallow. Usually the superstructure is towards the stern, the fish hold amidships, and the transversal trawl winch forward of the superstructure. A derrick may be boom-rigged to the foremast to help shoot the cod end from the side. Until the late 1960s, side trawlers were the most common deepsea boat used in North Atlantic fisheries. The 1950s side trawler,Ross Tiger is preserved in Grimsby while the larger, 1960s distant water vessel, theArctic Corsair is preserved in Hull. These trawlers were used for a longer period than other kinds of trawlers, but are now being replaced by stern trawlers. Some side trawlers still in use have been equipped with net drums.[24]
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| A drawing of a stern trawler |
Stern trawlers have trawls which are deployed and retrieved from the stern. Larger stern trawlers often have a ramp, thoughpelagic and small stern trawlers are often designed without a ramp. Stern trawlers are designed to operate in most weather conditions. They can work alone whenmidwater orbottom trawling, or two can work together as pair trawlers. The superstructure is forward with an aft working deck. At the stern are gallows or agantry for operating otter boards.[25]
Anyfish processing usually occurs in deck houses or below deck. A wet fish stern trawler stores the fish in ice or sea water which has been refrigerated. A freezer stern trawler stores the fish in frozen boxes or blocks, and a factory stern trawler processes the catch. A pelagic stern trawler may use fish pumps to empty the codend.[25]
The majority of trawlers operating on thehigh seas are freezer trawlers. They have facilities for preserving fish by freezing, allowing them to remain at sea for extended periods of time. They are medium- to large-size trawlers, with the same general arrangement as stern or side trawlers.[26]Drawing (FAO)Archived 2016-03-03 at theWayback Machine
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| A drawing of a wet fish trawler |
Wet fish trawlers are trawlers where the fish are kept in the hold in a fresh/wet condition, in boxes covered with ice or with ice in the fish hold. They must operate in areas close to their landing place, and the time such a vessel can spend fishing is limited.[27]
Trawler/purse seiners are designed so the deck equipment, including an appropriate combination winch, can be rearranged and used for both methods. Blocks, purse davits, trawl gallows and rollers need to be arranged so they control the pursing lines and warp leads and in such a way as to reduce the time required to convert from one arrangement to the other. These vessels are usually classified as trawlers, since the power requirement for trawling is higher.[28]
During both World Wars some countries created small warships by converting and arming existing trawlers or building new vessels to standard trawler designs. They were typically armed with a small naval gun and sometimes depth charges, and were used for patrolling, escorting other vessels and minesweeping.
Occupational safety is a concern on fishing trawlers. For example, a United States cooperative which operates a fleet of 24 bottom trawlers in Alaskan water reported 25 fatalities over the period 2001–2012. The risk of a fatal injury was 41 times higher than the average for workers in the United States.[29]
