To demonstrate the effect of proposed Scottish emergency technical conservation measures upon the landed and discarded catch from a commercial pair seine team. This required the systematic comparison of the catches obtained by both of the following codend/extension assemblies in combination with the vessels' own demersal pair seine gear:
Case A - Condend/extension assembly as defined by current legislation:
- Codend: 100mm diamond mesh, 5mm double 'compact' twine, 100 open meshes round, 100 meshes long.
- Square mesh panel: 90mm square mesh ultracross panel, 3m long, postioned between 9m and 12m from the codline.
- Extension: 500 meshes long, consisting of 100mm diamond mesh (100 open meshes round) in the following configuration (from the forward end): 200 meshes 4mm compact single twine and 300 meshes 5mm compact single twine.
- Lifting bag/cover: 265mm mesh lifting cover made of 6mm double compact twine.
Case B - Codend/extension assembly as defined by proposed emergency legislation.
- Codend: as case A
- Square-mesh panel: as case A but positioned between 6m and 9m from the codline.
- Extension: 200 meshes long, consitsting of 100mm diamond mesh, 100 open meshes round, with 5mm compact single twine.
- Lifting bag/cover: non fitted.
Michael Breen (Fisheries Research Services Aberdeen Marine Laboratory)
Biology and fisheries
Quantity: number of hauls = 40 Description: haddock and whiting