On Minimal Codend Mesh Size in Mid-water Redfish Fishery
In Division 3O, primarily, redfish of two species Sebastes mentella and S. fasciatus are harvested. The bulk of catch (85%) is made up by S. fasciatus. Calculations showed that with the change of mesh size from 132 mm to 88 mm in mid-water trawls in the redfish fishery the yield per recruit signi fi...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
2006
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.505.3461 http://archive.nafo.int/open/sc/2006/scr06-017.pdf |
| Summary: | In Division 3O, primarily, redfish of two species Sebastes mentella and S. fasciatus are harvested. The bulk of catch (85%) is made up by S. fasciatus. Calculations showed that with the change of mesh size from 132 mm to 88 mm in mid-water trawls in the redfish fishery the yield per recruit signi ficantly increased. When using mesh size of 118, 100 and 88 mm instead of 132 mm the largest yield per recruit would rise in 2.2, 3.1 and 3.5 times and concern fish aged 14, 10 and 8 years, respectively. With reducing mesh size the total yield per recruit increased during the calculation period to the age of 18 years. It became larger in 3.5-3.8 times for considered range of mesh size in the trawl codends from 132 mm to 88-100 mm. Previously it was also mentioned that the long-term positive effect for redfish harvesting by mid-water trawls with the increase of mesh size from 90-100 mm to 130 mm in Div. 3O as well as in the other areas of the North Atlantic during 15-20 years would have not been achieved under any acceptable fishing mortality. Since in Div. 3O S. fasciatus predominate their fishery by trawls with 90-100 mm mesh size would not have significant influence on structure of the other commercial redfish stocks in NAFO Regulatory Area. By-catch of every regulatory species in redfish fishery using trawls with 90-130 mm mesh size did not exceed |
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