Sea Fisheries Institute, Kołłątaja 1, 81-332 Gdynia, Poland
Key words: trawl catches, codend, cod, protection, selectivity, turned meshes.
In 1998, selectivity tests were carried out on codends with meshes turned through 90°:
� made of polyamide (PA) with 85 mm mesh openings in commercial catches,
� two polyethylene codends (PE) with 120 mm and 100 mm mesh openings.
The polyethylene codends tests were carried out jointly by the Sea Fisheries Institute in Gdynia and the Institut f�r Fischereitechnik (IFH) in Hamburg.
In both cases, the test results of the new codend constructions proved their significant protective properties. Codends with meshes turned through 90° have many advantages and their application may help to restore fish resources in the Baltic Sea.