Neues aus der Selektionsforschung am Ostseedorsch
In account of the decision of the IBSFC (InternationalBaltic Sea Fisheries Commission) to admit alternativecodend constructions to the presently legal of diamondmeshes with 120 mm mesh opening, since seven years a vivid research activity is encouraged at the fishing technology institutions around the Baltic. Though a center of gravity in this field of research lies in the EUproject BACOMA (participants Finland Sweden, Denmark) also the corresponding national institutes of other Baltic countries (Germany, Poland, Russia) have been active with similar investigations. German experiments in 1999 dealt with the effect of the use of netting made of double instead of single yarn on the selectivity. Further research was done on modifications of codends made from netting turned 90° from its original orientation and on simplified versions ofthe so-called Multipanel codend which consists of threeequal diamond and three square mesh panels. The experiments demonstrated on the one hand a definite deterioration of the selective properties in a codend made from double instead of single yarn. Constructional changes in codends made from netting turned 90° on the other hand brought a further improvement of the selectivity of such codends. Finally, the investigations on the Multipanel codend revealed the overwhelming influence of the square mesh panels on the selectivity success. If in a conventional diamond codend three windows are cut out starting 50 cm from the real end of the codend in such a way that the remaining parts have the same breadth as the square mesh panels to insert, the selective effect of such a codend is remarkably improved. According to further preliminary teststhis seems to be nearly independent from the type of material used.
| Main Authors: | , |
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| Format: | article biblioteca |
| Language: | German |
| Published: |
2000
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| Subjects: | Fisheries, Engineering, Baltic Sea, fishing technique, regulations, net construction, mesh selection, cod, |
| Online Access: | http://hdl.handle.net/1834/21012 |
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