Marian Szatybełko
Sea Fisheries Institute, Kołłątaja 1, 81-332 Gdynia, Poland
Key words: cod, trawl, codend, selectivity, hydromechanics.
Abstract.
The research relates to the issue of the selectivity of cod trawl codends
and verifies the conception of the opening of meshes in the netting of
codends by using ropes with selected mechanical properties. For this purpose,
an experimental codend had been made, which underwent exploitational
tests with the use of a set of selectivity tests on cod trawl codends.
The tests have confirmed the assumptions of the conception: the experimental
codend, though it requires further technological and constructional improvements,
exhibited the required selectivity. With mesh bar length in the codend
equal to 60 mm, L50 equals 35 cm, which corresponds to
the minimum legal length of cod being currently in force.