The efficiency of sieve‐panels for bycatch separation in Nephrops trawls

Authors
Santos, J., Herrmann, B., Mieske, B., Krag, L.A., Haase, S. Stepputtis, D.
Year
Journal/Publisher Name
Fisheries Management and Ecology
Volume (Issue #)
25(6)
Page #s
464-473
Contact information
juan.santos@thuenen.de
Summary

This study investigated the efficiency of a sieve‐panel to separate bycatch species from Norway lobster (Nephrops norvegicus) in trawl gear via mechanical and behavioral means. Four different designs of varying panel mesh size or inclination were tested. The sieving efficiency for Nephrops increased from ~17% to ~71% as mesh size increased, and decreased with increasing carapace length, but did so less as panel inclination and mesh size increased. The sieving efficiency for roundfish was low, while the efficiency for flatfish decreased with fish size. Although results are promising, the sieving efficiency for the largest, most valuable Nephrops remained too low for commercial implementation of the gear modifications. 

Field Studies

The efficiency of sieve‐panels for bycatch separation in Nephrops trawls

Study Type
Field study in the wild
Location
Skagerrak, Norway
Target catch
Norway lobster (Nephrops norvegicus)
Effect on bycatch species
Bycatch of roundfish and flatfish was low
Effect on target catch
Optimal catch size of large Nephrops was too low for commercial use
Bycatch species
Reduction technique
Fishing Gear