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Single Trawl | Multi Rig Trawl | Seine Net | Pair Seine


Single Trawl

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Jackson, Harvest Hope

Single Trawling developed in Scotland owing to the increasing market price obtainable for ground fish such as monkfish, plaice, megrims, sole and prawns. Modern day demersal single boat trawling can probably be split into three categories. Jackson Trawls have kept pace with modern developments and now use computerised net design software as a design aid which gives an excellent graphic simulation tool to help our customers to fine tune their nets.

Firstly, High Standing Heavy Hopper Trawls, which are designed to catch ground fish and those, which swim higher in the water column. The "Jackson, Harvest Hope 470" being typical of this design, a two panel construction V- wing design, ballooned on the top and attached to very heavy hoppers, allowing it to fish effectively even over the hardest of bottom.

Secondly, Hard Ground All-Purpose Nets, designed to be useable in all weather conditions and sea depths, well within the vessels towing capabilities. The "Jackson, Arkh Angell 520" is typical of this type having a cut away lower gavel and medium length ground gear on 16" rockhoppers. This design fishes very well, being easy to tow.

Thirdly, Clean Ground Scraper Nets with long wings and low headline heights for species such as prawn and monkfish. Jackson Trawls have developed the "Knife" to target this market with the term "knife" stemming from the Irish fishermen's terminology for a net's bosom. The "Jackson Knife" has a broad supported bosom which maximises fishing efficiency for prawns and monkfish, as it was found that this aspect of the net's design is crucial for these species.

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Multi Rig Trawl

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Apollo

Twin and triple rig trawling have developed over recent years in order to maximise sweep and ground contact and hence fishing effectiveness for ground species. The pioneers of this method were initially prawn fishermen, with white fish skippers following on later. The vessel usually tows the gear using multiple warps and winches with the inner warp being shorter than the outer wires in order to allow the doors to spread the gear.

Multi rig gear can be broadly divided into three categories. Firstly, dedicated Prawn Nets constructed from 80mm netting on small rockhopper foot ropes or rubber leg ground gear. Usually these nets have long low wings and straight gavels with no fishtail. We have the "Jackson Knife" and the "Jackson Dalriada 420" as good fishing examples of this type of design.

Secondly, Whitefish Nets were developed along similar lines with the main difference being the change in mesh size from 80mm to 100 or 120mm. These nets continue with the long wing characteristics of the prawn gear, but include fishtails in order to provide higher headline height. These nets give similar performance to prawn gear without the restriction on by catch which prawn gear imposes. The "Jackson, Benarkle 40 fathom Knife" fishes very well in this category.

Thirdly, the Hard Ground Twin Rig, purely for demersal species. These nets are constructed along similar lines to conventional single trawls with heavy hoppers; top fishtails and cut away lower gavels. In the UK industry at present the most popular net of this type is the "Jackson, Nordfjordr 540" which has a headline height of around 15 feet on a fishing line of 120 feet.

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Seine Net

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Glenugie Scottish seining was developed from Danish anchor seining in the 1950's and uses a similar principle, in that long ropes are used to herd fish into the net. In practice the operation begins by a floating dahn being shot to mark one end of the rope, followed by ropes, the net and more ropes on the way back to pick up the dahn. This pattern makes a triangle with the boat at the apex and the net in the middle of the opposite leg. When the tow commences the ropes are retrieved and slowly close, thus herding the fish into the mouth of the net.

This fishing method is very cost effective owing to the short duration of the tows and the lightness of construction materials in the gear reducing drag, resulting in reduced fuel consumption.

Three specific types of gear are common, firstly, Clean Ground Seine Nets which are typically larger than trawl nets although lighter in construction having rope foot ropes rather than rockhoppers. Typical examples would be the "Jackson, Glenugie 900".

Secondly, Rockhopper Seine Nets, which have rubber disc foot ropes in order to enable the net to be towed over hard ground. These nets are similar in circumference to demersal trawls but usually lighter in construction and longer in the wings. Successful examples would be the "Jackson, Arktos 620", being a tried and tested, effective, popular model.

Thirdly, of recent years we have noted a desire for fishermen to keep the high water species such as Hake and Whiting, whilst increasingly targeting high value ground fish such as Megrims. This fishing has been particularly successful in SW Ireland and England and Jackson Trawls have supplied these new Dual Purpose Nets to many vessels in these areas. Designs of particular note are the "Jackson, Rose Catriona 480".

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Pair Seine

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Denebula The Scottish seine net fleet discovered that, at certain times of the year targeted fish stocks were swimming higher in the water column above the headlines of their seine nets. The boats did not have sufficient power to tow higher headline nets and so they opted to pair up to tow one net between two boats. Thus, larger nets could be towed by using the combined engine horsepower of two vessels. This method involves one boat shooting its net and sweeps and then passing one wing end of the net over to the partner vessel. Each boat then sets a fleet of rope and assumes station along side each other, with the boat's separation serving to hold the gear open. Upon completion of the tow the boats heave up and again pass the end of the net back to the towing vessel. Pair seining differs from pair trawling in that there is a lot of ground contact by the ropes which helps to herd the fish into the net.

Pair seine gear can be divided sub-divided into two categories, firstly, Hard Ground designs such as the "Jackson, Budding Rose 550" which is heavily constructed in the manner of a hard ground trawl, but larger in circumference in order to provide high headline height. This net features a ballooned top sheet for lift and tapered belly to minimise belly contact, thus reducing damage on hard ground.

Secondly, Clean Ground Pair Seines such as the "Jackson, Denebula 760" which have long wires for ground contact and large circumference for headline height. These nets can be supplied with rope foot rope or else small rockhoppers.

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More information on any of the fishing methods and trawl design can be obtained by contacting us where we'll be delighted to answer any gear requirements which you may have.

Jackson Trawls Ltd. Blackhouse Industrial Estate, Peterhead, Aberdeenshire, Scotland, AB42 1BN