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Food and Agriculture Organization of the United Nationsfor a world without hunger
Equipment Class: Fishing technologyEquipment Type: Environmental measures
Nordmore grid is primarly designed to exclude large animals from prawn trawls. It features an alluminium grid secured to the trawl at 45-60 degrees from the vertical.
Bar spacing is typically 100 mm. A panel of netting guides all animals to the bottom of the grid. Large animals are the guided by the grid towards the escape opening in the top of the codend while shrimps and other small animals pass through the grid and enter the codend. Prawn loss may be due to incorrect grid angle, grid blockage or poor guiding panel performance. High grid angles may increase the distance between the guiding panel and grid and allow prawns to escape. Increasing the length of the guiding panel or adding weights to the end of the panel may prevent prawn loss. Grid blockage by sponges, coral etc. may be caused by low grid angles or poor grid design. Increasing the size of the exit hole between panel and codend my reduce this problem.
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