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- Topics
- Types
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Demersal Trawl - Nephrops trawl
A low demersal trawl towed on the seabed, with the mouth held open by a pair of otter boards (trawl doors) designed to target nephrops. -
Demersal Trawl - Rockhopper trawl
The rockhopper, or hopper trawl, is a trawl that is towed on the seabed, with the mouth held open by a pair of otter boards (trawl doors). -
Demersal Trawl - Scraper net
A long low, demersal trawl towed on the seabed, with the mouth held open by a pair of otter boards (trawl doors). -
Demersal Trawl - Sole Trawl
A trawl towed on the seabed, with the mouth held open by a pair of otter boards (trawl doors) designed and rigged to target Dover sole. -
DRB - Scallop Dredge
A scallop dredge is a rigid structure with a chain mail collecting bag, towed on the seabed to target king scallops. -
Drift Nets
This type of gill net is suspended in the water, usually just below the surface, but can be worked anywhere to target pelagic species. -
Fyke Net
A fyke net is a type of fish trap and are generally operated in shallow coastal waters, such as estuaries and sheltered bays. -
Gill Nets
A gill net is a single wall of netting anchored on the seabed to catch fish that swim into it. -
Hand lines
Fishing using a rod or hand held lines as a commercial venture in a similar manner to recreation angling. -
Jigging
Jigging is a method of fishing. Hooks are attached to artificial lures to attract and capture fish. -
LA Ring Net
A LA Ring Net is a long net that is shot to surround a shoal of pelagic fish with a ‘wall’ of netting. -
Long line
Long lining can be used to target both pelagic and demersal fish. -
Multi Rig - Quad rig
A method of towing four otter trawls side by side. -
Multi Rig Trawl - Nephrops triple rig
In this rig three trawls are towed side by side using four trawl warps. -
Multi Rig Trawl - Sole triple rig
This is a fishing method used by smaller vessels to target Dover sole. It involves towing three small trawl side by side. -
Out-rig Trawling
Out-rig trawling is a method of multi rig trawling where two small otter trawls with nets behind, are towed from the ends of outrigger derricks. -
Pair Seine
In this fishing method a net similar to a demersal trawl is towed by two boats simultaneously. -
Pair Trawl
In this fishing method a demersal trawl is towed by two boats simultaneously, one towing each side of the trawl. -
Pelagic Pair Trawl
A trawl towed in mid-water between two vessels to target pelagic fish. -
Pelagic Trawl
In this fishing method, the trawl is towed in mid-water by a vessel and is designed to catch pelagic fish. -
Pole and Line
This is a basic rod and line fishery using barbless hooks and live bait. -
Pots and Trap - Nephrops
Nephrops creels or prawn creels as they are generally called, are of the basic D creel design but lighter than that of a lobster or crab pot. -
Pots and Traps - Brown Crab
Two main shapes of trap are used to target brown crabs. -
Pots and Traps - Cuttlefish
Cuttlefish traps are usually larger than most other traps but of lightweight construction. -
Pots and Traps - General
Pots and traps are generally rigid structures into which fish or shellfish are guided through funnels that make entry easy but escape difficult. -
Pots and Traps - Lobster
The D shaped creel with two entrances is the favoured trap by many lobster fishermen. -
Pots and Traps - Velvet Crab
Traps or creels, used for velvet crab are similar to those used for lobster. -
Pots and Traps - Whelks
Plastic drums with a netting entrance set on the seabed for targeting whelks. -
PS - Purse Seine
A purse seine is a large net used to surround a shoal of pelagic fish. -
Queen Scallop Dredge
A dredge used to target queen scallops are wider and higher than a traditional Newhaven scallop dredge. -
SDN - Anchor Seine
A net shot in the open sea using very long ropes to lay out the net and ropes on the seabed prior to hauling from a boat at anchor. -
Semi-Pelagic Trawl
A trawl towed on or very close to the seabed with the trawl doors swimming several metres off the seabed. -
Small Line
A fishing method is similar to longline fishing but adapted to suit the smaller inshore vessels. -
SSC - Scottish Seine
In the Scottish seine the gear is shot on the seabed in a rounded triangle shape with very long weighted ropes attached to each end of the net. -
Stake Net
A net with a long vertical wall of netting held up by a line of strong wooden poles erected upwards from the beach. -
Tangle Nets
A gill net design where the netting is hung onto the ropes to create a greater amount of slack netting. -
Trammel Nets
Fishing nets similar to a gill net but are made up of three layers of netting. -
Trolling
Trolling is a method of fishing where the boat tows a line or lines with one or more hooks with a natural bait or an artificial lure. -
Twin Rig Trawl - Mixed species twin rig
A fishing method using two trawls side by side to target a mix of bottom living species and demersal round fish. -
Twin Rig Trawl - Nephrops
A method of towing two otter trawls side by side to target nephrops. -
Twin Rig Trawl - Sole twin rig
A fishing method used by smaller vessels to target Dover sole. It involves towing two small trawls side by side. -
Wreck Nets
Wreck nets are types of gill or trammel nets that have been rigged to shoot over wrecks or areas of hard ground on the seabed. -
Types of fishing gear
Different kinds of gear have evolved to target particular species or groups of species. We have produced guidance on commonly used fishing gear. -
Fishing Gear Glossary
A glossary of equipment and technology. -
Selective device
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4 Panel Cod-end
By constructing a 4 panel cod-end, it allows the cod-end to remain more open and increases the flow of water, allowing the fish more space to swim. -
Acoustic deterrents
An acoustic deterrent is a device that emits pulses of high frequency sound to deter cetaceans from approaching fishing gear. -
Amity Net Grid
The amity net grid is a selective device designed to separate nephrops from fish. -
Benthic Panel
A benthic panel is a small panel of square mesh or large diamond mesh inserted in the bottom panel of a trawl. -
Benthos Release Panel
A Benthos or Benthic release panel is a panel of larger diamond mesh or square mesh netting fitted into the lower panel of a trawl. -
Box Trawl
A selective box trawl is made up of 4 panels of netting with these 4 panels carried right down to a 4 panel cod-end. -
Cefas Net Grid
The Cefas Net Grid is a selective device designed to separate nephrops from fish. -
Coverless Trawls
A coverless trawl has the top panel of the net cut back so that the headline and footrope are of similar length. -
Diamond Mesh Size
Most fishing gear is made of netting with diamond shaped meshes, this gives the gear flexibility and a certain amount of stretch. -
Eliminator Trawl
The eliminator trawl is a standard demersal trawl with very large diamond meshes in the wings and forward part of the trawl. -
Escape Gaps
Escape gaps are usually flat pieces of rigid plastic with a rectangular hole in that is fitted into pots and traps to release small shellfish -
F-Cap. (Faithlie Cod Avoidance Panel)
The F-CAP was developed to release cod from a nephrops trawl. -
Fish Stimulation
Fish stimulation being used as a selective device is still a relatively new concept. It is being trialled using a light, sound or electric pulses. -
Gear Operation
This is where there is a complete change of fishing gear or the way the fishing gear is operated to change the catch composition. -
Gear Size
Reducing the physical size of the whole gear or just part of the gear to reduce unwanted by-catch and be able to handle the gear more efficiently. -
Headline Height
A trawl or static net where the gear has been redesigned to keep the headline (top of the net) low to prevent the capture of high swimming species. -
Inclined Netting Grids
An inclined netting grid is a panel of netting fitted inside a trawl and set at an angle. -
Number of Dredges
In some scallop dredge fisheries the number of dredges used is regulated to ensure fishing effort remains within manageable limits. -
Off Bottom Trawl
This is a trawl that, by the way it is rigged and towed, swims clear of the seabed but close enough to target some of the demersal species. -
Ring Size
The ring size of scallop dredges can be used as a selectivity measure to release scallops below a certain size. -
SELTRA Box - Diamond mesh
The SELTRA box is a four panel extension section with a top panel of either large diamond mesh or large square mesh to encourage small fish to escape. -
SELTRA Box - Square mesh panel
The SELTRA box is a four panel extension section with a top panel of either large diamond mesh or large square mesh to encourage small fish to escape. -
Separator panels
A separator panel is a horizontal panel of netting designed to divide the trawl into two sections one above the other. -
Sep-Nep codend
The Sep-Nep is an inclined panel of diamond netting to sieve the nephrops into the lower chamber and direct the fish into the upper chamber. -
Sort X grid
The Sort X grid was developed in Norway as a measure to reduce the numbers of small fish being caught when targeting cod in the Barents Sea. -
Square Mesh Cod-ends
This is one of the most effective escape devices available for the release of small undersized round fish. -
Square Mesh Panels
The square mesh panel is one of the most common used and well known selective devices. -
T90 Cod-ends
In this design the cod-end mesh is turned through 90 degrees into T90 configuration. -
Towing speed
In some situations a change in towing speed can dramatically change the composition of the catch. -
Inclined Separator Panels
An inclined separator panel separates the catch into the bottom living and the higher swimming species and directs them into two separate cod-ends. -
Technical Information
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Bridle Angle and Wing End Spread calculations
Calculations for the bridle angle of a single trawl and wing end spread using a calculator. -
Calculating the Spread of Trawl Doors
Guidance for skippers on calculating the spread of trawl doors. -
Calculating the Sweep Angle and Wing End Spread of a Single Demersal Trawl
An easy to use calculation for wing end spread and sweep angle of a single trawl. -
Flip Up Ropes Construction
Guidance on the design and construction of a Flip Up Rope for fitting into a demersal otter trawl. -
Three Warp Twin Rig - Shortening the Centre Warp
Sheets with figures to advise skippers towing three warp twin rig trawl gear how much to shorten the centre warp by to keep the gear square. -
Trawl Door Spread
The distance between the trawl doors is an important piece of information for any trawler skipper to know at all times. -
Search results
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Aquaculture - farming seafood
Aquaculture production is growing in the UK. We’ve collated information on responsible seafood farming and resources for aquaculture businesses. -
Species farmed in aquaculture
We’ve collated information on commonly farmed species of fish and shellfish and how they are classified. -
Aquaculture profiles
Aquaculture profiles -
Atlantic Halibut
The Atlantic halibut is a large flatfish that can reach a weight of over 300kg in the wild. -
Sources, Quantities and Cultivation Methods
Atlantic Halibut (Hippoglossus hippoglossus) Aquaculture Profile - Sources, quantities and cultivation methods. -
Governance and Outlook
Atlantic Halibut (Hippoglossus hippoglossus) Aquaculture Profile - Governance and outlook. -
Farm Siting
Atlantic Halibut (Hippoglossus hippoglossus) Aquaculture Profile - Farm Siting. -
Nutrient Pollution
Atlantic Halibut (Hippoglossus hippoglossus) Aquaculture Profile - Nutrient Pollution. -
Feed
Atlantic Halibut (Hippoglossus hippoglossus) Aquaculture Profile - Feed. -
Disease, Medicines and Chemicals
Atlantic Halibut (Hippoglossus hippoglossus) Aquaculture Profile - Disease, medicines and chemicals. -
Escapes and Introductions
Atlantic Halibut (Hippoglossus hippoglossus) Aquaculture Profile - Escapes and Introductions. -
Certification
Atlantic Halibut (Hippoglossus hippoglossus) Aquaculture Profile - Certification. -
Atlantic Salmon
Atlantic salmon is one of the world’s most iconic farmed aquatic species. -
Sources, Quantities and Cultivation Methods
Atlantic Salmon (Salmo salar) Aquaculture Profile - Sources, quantities and cultivation methods. -
Governance and Outlook
Atlantic Salmon – (Salmon salar) Aquaculture Profile - Governance and Outlook. -
Farm Siting
Atlantic Salmon (Salmo salar) Aquaculture Profile - Farm Siting. -
Nutrient Pollution
Atlantic Salmon (Salmo salar) Aquaculture Profile - Nutrient Pollution. -
Feed
Atlantic Salmon (Salmo salar) Aquaculture Profile - Feed. -
Disease, Medicines and Chemicals
Atlantic Salmon (Salmo salar) Aquaculture Profile - Disease, medicines and chemicals. -
Escapes and Introductions
Atlantic Salmon (Salmo salar) Aquaculture Profile - Escapes and Introductions. -
Certification
Atlantic Salmon (Salmo salar) Aquaculture Profile - Certification. -
White Leg Prawn
White Leg Prawns (widely known as "vannamei") are native to the warm marine waters of the Eastern Pacific. -
Sources, Quantities and Cultivation Methods
White Leg Prawn (Litopenaeus vannamei) Aquaculture Profile - Sources, Quantities and Cultivation Methods. -
Governance and Outlook
White Leg Prawn (Litopenaeus vannamei) Aquaculture Profile - Governance and Outlook. -
Farm Siting
White Leg Prawn (Litopenaeus vannamei) Aquaculture Profile - Farm Siting. -
Nutrient Pollution
White Leg Prawn (Litopenaeus vannamei) Aquaculture Profile - Nutrient Pollution. -
Feed
White Leg Prawn (Litopenaeus vannamei) Aquaculture Profile - Feed. -
Disease, Medicines and Chemicals
White Leg Prawn (Litopenaeus vannamei) Aquaculture Profile - Disease, Medicines and Chemicals. -
Escapes and Introductions
White Leg Prawn (Litopenaeus vannamei) Aquaculture Profile - Escapes and Introductions. -
Certification
White Leg Prawn (Litopenaeus vannamei) Aquaculture Profile - Certification. -
European Sea Bass
The European sea bass aquaculture industry has grown strongly since the early 1990s and represents one of the most important farmed species. -
Sources, Quantities and Cultivation Methods
European Sea Bass (Dicentrachus labrax) Aquaculture Profile - Sources, quantities and cultivation methods. -
Governance and Outlook
European Sea Bass (Dicentrachus labrax) Aquaculture Profile - Governance and Outlook. -
Farm Siting
European Sea Bass (Dicentrachus labrax) Aquaculture Profile - Farm Siting. -
Nutrient Pollution
European Sea Bass (Dicentrachus labrax) Aquaculture Profile - Nutrient Pollution. -
Feed
European Sea Bass (Dicentrachus labrax) Aquaculture Profile - Feed. -
Disease, Medicines and Chemicals
European Sea Bass (Dicentrachus labrax) Aquaculture Profile - Disease, medicines and chemicals. -
Escapes and Introductions
European Sea Bass (Dicentrachus labrax) Aquaculture Profile - Escapes and Introductions. -
Certification
European Sea Bass (Dicentrachus labrax) Aquaculture Profile - Certification. -
Gilthead Sea Bream
The Gilthead sea bream aquaculture industry represents one of the most important farmed species in the Mediterranean. -
Sources, Quantities and Cultivation Methods
Gilthead Sea Bream (Sparus aurata) Aquaculture Profile - Sources, quantities and cultivation methods. -
Governance and Outlook
Gilthead Sea Bream (Sparus aurata) Aquaculture Profile - Governance and Outlook. -
Farm Siting
Gilthead Sea Bream (Sparus aurata) Aquaculture Profile - Farm Siting. -
Nutrient Pollution
Gilthead Sea Bream (Sparus aurata) Aquaculture Profile - Nutrient Pollution. -
Feed
Gilthead Sea Bream (Sparus aurata) Aquaculture Profile - Feed. -
Disease, Medicines and Chemicals
Gilthead Sea Bream (Sparus aurata) Aquaculture Profile - Disease, medicines and chemicals. -
Escapes and Introductions
Gilthead Sea Bream (Sparus aurata) Aquaculture Profile - Escapes and Introductions. -
Certification
Gilthead Sea Bream (Sparus aurata) Aquaculture Profile - Certification. -
Mussels
Mussel farming extends across temperate and tropical regions in inshore environments, as well as in deeper, offshore waters. -
Sources, Quantities and Cultivation Methods
Mussels Aquaculture Profile - Sources, quantities and cultivation methods. -
Governance and Outlook
Mussels Aquaculture Profile - Governance and Outlook. -
Farm Siting
Mussels Aquaculture Profile - Farm Siting. -
Water Quality
Mussels Aquaculture Profile - Water Quality. -
Wild Seed
Mussels Aquaculture Profile - Wild Seed. -
Certification
Mussels Aquaculture Profile - Certification. -
Turbot
Turbot is a fast-growing flatfish found naturally in the Northeast Atlantic and the Mediterranean. -
Sources, Quantities and Cultivation Methods
Turbot (Psetta maxima) Aquaculture Profile - Sources, Quantities and Cultivation Methods. -
Governance and Outlook
Turbot (Psetta maxima) Aquaculture Profile - Governance and Outlook. -
Farm Siting
Turbot (Psetta maxima) Aquaculture Profile - Farm Siting. -
Nutrient Pollution
Turbot (Psetta maxima) Aquaculture Profile - Nutrient Pollution. -
Feed
Turbot (Psetta maxima) Aquaculture Profile - Disease, Medicines and Chemicals. -
Disease, Medicines and Chemicals
Turbot (Psetta maxima) Aquaculture Profile - Disease, Medicines and Chemicals. -
Escapes and Introductions
Turbot (Psetta maxima) Aquaculture Profile - Escapes and Introductions. -
Certification
Turbot (Psetta maxima) Aquaculture Profile - Certification. -
Oysters
Oyster farming extends across many countries of the world. The adaptability of oysters makes them a good aquaculture species. -
Sources, Quantities and Cultivation Methods
Oysters Aquaculture Profile - Sources, quantities and cultivation methods. -
Governance and Outlook
Oysters Aquaculture Profile - Governance and Outlook. -
Farm Siting
Oysters Aquaculture Profiles - Farm Siting. -
Water Quality
Oysters Aquaculture Profile - Water Quality. -
Escapes and Introductions
Oysters Aquaculture Profile - Escapes and Introductions. -
Certification
Oysters Aquaculture Profile - Certification. -
Tilapia
Tilapias are a group of warm-water fish species with the second largest share of global aquaculture production after carps. -
Sources, Quantities and Cultivation Methods
Tilapia (Oreochromis / Sarotherodon / Tilapia spp.) Aquaculture Profile - Sources, quantities and cultivation methods. -
Governance and Outlook
Tilapia (Oreochromis / Sarotherodon / Tilapia spp.) Aquaculture Profile - Governance and Outlook. -
Farm Siting
Tilapia (Oreochromis / Sarotherodon / Tilapia spp.) Aquaculture Profile - Farm Siting. -
Nutrient Pollution
Tilapia (Oreochromis / Sarotherodon / Tilapia spp.) Aquaculture Profile - Nutrient Pollution. -
Feed
Tilapia (Oreochromis / Sarotherodon / Tilapia spp.) Aquaculture Profile - Feed. -
Disease, Medicines and Chemicals
Tilapia (Oreochromis / Sarotherodon / Tilapia spp.) Aquaculture Profile - Disease, medicines and chemicals. -
Escapes and Introductions
Tilapia (Oreochromis / Sarotherodon / Tilapia spp.) Aquaculture Profile - Escapes and Introductions. -
Certification
Tilapia (Oreochromis / Sarotherodon / Tilapia spp.) Aquaculture Profile - Certification. -
Tiger Prawn
Tiger Prawns (widely known as "monodon") are native to the warm marine waters of Australia, South and SE Asia, and East Africa.