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  • Acoustic deterrents

    An acoustic deterrent is a device that emits pulses of high frequency sound to deter cetaceans from approaching fishing gear.
    Selective device

  • Amity Net Grid

    The amity net grid is a selective device designed to separate nephrops from fish.
    Selective device

  • Benthic Panel

    A benthic panel is a small panel of square mesh or large diamond mesh inserted in the bottom panel of a trawl.
    Selective device

  • 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.
    Selective device

  • 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.
    Selective device

  • Cefas Net Grid

    The Cefas Net Grid is a selective device designed to separate nephrops from fish.
    Selective device

  • Coverless Trawls

    A coverless trawl has the top panel of the net cut back so that the headline and footrope are of similar length.
    Selective device

  • 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.
    Selective device

  • Eliminator Trawl

    The eliminator trawl is a standard demersal trawl with very large diamond meshes in the wings and forward part of the trawl.
    Selective device

  • 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
    Selective device

  • F-Cap. (Faithlie Cod Avoidance Panel)

    The F-CAP was developed to release cod from a nephrops trawl.
    Selective device

  • 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.
    Selective device

  • 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.
    Selective device

  • 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.
    Selective device

  • 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.
    Selective device

  • Inclined Netting Grids

    An inclined netting grid is a panel of netting fitted inside a trawl and set at an angle.
    Selective device

  • Number of Dredges

    In some scallop dredge fisheries the number of dredges used is regulated to ensure fishing effort remains within manageable limits.
    Selective device

  • 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.
    Selective device

  • Ring Size

    The ring size of scallop dredges can be used as a selectivity measure to release scallops below a certain size.
    Selective device

  • 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.
    Selective device

  • 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.
    Selective device

  • Separator panels

    A separator panel is a horizontal panel of netting designed to divide the trawl into two sections one above the other.
    Selective device

  • 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.
    Selective device

  • 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.
    Selective device

  • Square Mesh Cod-ends

    This is one of the most effective escape devices available for the release of small undersized round fish.
    Selective device

  • Square Mesh Panels

    The square mesh panel is one of the most common used and well known selective devices.
    Selective device

  • T90 Cod-ends

    In this design the cod-end mesh is turned through 90 degrees into T90 configuration.
    Selective device

  • Towing speed

    In some situations a change in towing speed can dramatically change the composition of the catch.
    Selective device

  • 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.
    Selective device

  • Technical Information

  • Bridle Angle and Wing End Spread calculations

    Calculations for the bridle angle of a single trawl and wing end spread using a calculator.
    Technical information

  • Calculating the Spread of Trawl Doors

    Guidance for skippers on calculating the spread of trawl doors.
    Technical information

  • 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.
    Technical information

  • Flip Up Ropes Construction

    Guidance on the design and construction of a Flip Up Rope for fitting into a demersal otter trawl.
    Technical information

  • 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.
    Technical information

  • Trawl Door Spread

    The distance between the trawl doors is an important piece of information for any trawler skipper to know at all times.
    Technical information

  • Search results

  • Aquaculture - farming seafood

    Aquaculture production is growing in the UK. We’ve collated information on responsible seafood farming and resources for aquaculture businesses.
    Article

  • Species farmed in aquaculture

    We’ve collated information on commonly farmed species of fish and shellfish and how they are classified.
    Article

  • Aquaculture profiles

    Aquaculture profiles

  • Atlantic Halibut

    The Atlantic halibut is a large flatfish that can reach a weight of over 300kg in the wild.
    Aquaculture profile

  • Sources, Quantities and Cultivation Methods

    Atlantic Halibut (Hippoglossus hippoglossus) Aquaculture Profile - Sources, quantities and cultivation methods.
    Aquaculture profile section

  • Governance and Outlook

    Atlantic Halibut (Hippoglossus hippoglossus) Aquaculture Profile - Governance and outlook.
    Aquaculture profile section

  • Farm Siting

    Atlantic Halibut (Hippoglossus hippoglossus) Aquaculture Profile - Farm Siting.
    Aquaculture profile section

  • Nutrient Pollution

    Atlantic Halibut (Hippoglossus hippoglossus) Aquaculture Profile - Nutrient Pollution.
    Aquaculture profile section

  • Feed

    Atlantic Halibut (Hippoglossus hippoglossus) Aquaculture Profile - Feed.
    Aquaculture profile section

  • Disease, Medicines and Chemicals

    Atlantic Halibut (Hippoglossus hippoglossus) Aquaculture Profile - Disease, medicines and chemicals.
    Aquaculture profile section

  • Escapes and Introductions

    Atlantic Halibut (Hippoglossus hippoglossus) Aquaculture Profile - Escapes and Introductions.
    Aquaculture profile section

  • Certification

    Atlantic Halibut (Hippoglossus hippoglossus) Aquaculture Profile - Certification.
    Aquaculture profile section

  • Atlantic Salmon

    Atlantic salmon is one of the world’s most iconic farmed aquatic species.
    Aquaculture profile

  • Sources, Quantities and Cultivation Methods

    Atlantic Salmon (Salmo salar) Aquaculture Profile - Sources, quantities and cultivation methods.
    Aquaculture profile section

  • Governance and Outlook

    Atlantic Salmon – (Salmon salar) Aquaculture Profile - Governance and Outlook.
    Aquaculture profile section