The choice went to the company's high-efficiency Type 22 Bluestream trawl doors that have already proved their value both for pelagic fisheries and for spreading demersal gear with the doors flown off the seabed. The Type 22 doors also come in Flipperversions, fitted with up to four flaps that can be opened to reduce the surface area of the doors by up to 11, providing adjustment options for switching from one gear type to another.This makes the Bluestream doors among the most versatile trawl doors on the market, according to Henrik Andreassen."It's about achieving more spread for less resistance." he said, adding that the addition of a hydraulic system to the leading side of each door is set to increase this versatility further as this makes it possible to adjust the warp attachment point while towing to alter the roll of the doors - without having to haul the gear and make the adjustment manually."This means that the shape, symmetry, positioning and depth of the trawl can be adjusted remotely," Henrik Andreassen said, after the initial trials on board Themis took place earlier this year.
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