These high quality net bags are to fit the small sized surber frame. They connect to the frame by threading onto an inner brass ring which attaches to the outer frame using a series of brackets, held in place with nuts and bolts. This means that the net collar is protected from rubbing on the river substrate by the outer frame; this considerably reduces wear and tear. The collar is made from strong nylon which also helps to improve longevity. The end of the net is fitted with a removable screw-on filter which has the same mesh size as the main part of the net.
Available with 1mm, 500µm and 250µm mesh.
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On behalf of Parque Nacional Nahuel Huapi I would like to thank NHBS. The book will be very useful for my students.
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