Turkish Journal of Fisheries and Aquatic Sciences
2019, Vol 19, Num, 6 (Pages: 451-461)
Selectivity of Different Alternative Cod Ends and Radial Square Mesh Escape Panels (RSEP)
Yusuf Ceylan 1 ,Cemalettin Sahin 1
1 Recep Tayyip Erdoğan University, Faculty of Fisheries, Rize, Turkey
DOI :
10.4194/1303-2712-v19_6_01
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Bottom trawl fishery is carried out intensively throughout the season in the Black sea.
For this reason, the selectivity effects of five codend with different mesh size, shapes
and escape panels (commercial (40D), 50 mm diamond-shaped (50D), and 40 mm
square-mesh (40S) and radial square mesh escape panels (RSEP) which were added
to the front and back section of 40D) were investigated. Using a commercial fishing
trawl, 44 valid hauls were carried out from August 23rd to October 24th 2016 on the
Sakarya coast to the South west of the Black Sea. The L50 value of commercial cod
end was calculated as was 12.9 cm for Mullus barbatus (red mullet), and was
improved in cod ends with RSEPs. Further, the L50 values obtained from the other
cod ends were found to be very high (40S: 15.62 cm, 50D: 15.24 cm). It was noticed
that none of the cod ends showed sufficient selectivity for bluefish (Pomatomus
saltatrix), which was caught as bycatch. The comparative account of the findings of
current study with the previous studies advocates that the cod ends need to be made
from PA netting and RSEP should be applied for more escape area.
Keywords :
Selectivity, Radial square mesh escape panel, Bottom trawl, Mullus barbatus, Black Sea