T90 Cod-ends
Summary
In this design the cod-end mesh is turned through 90 degrees into T90 configuration. This is when normal diamond mesh is turned through 90 degrees to enable the meshes to stay more open while the gear is being towed.
Size selectivity
T90 is good for releasing small fish. T90 meshes enable the meshes in the cod end to remain more open throughout the full tow. This allows the release of small fish of all species. the actual size released depends entirely on the size of mesh used. In traditional diamond mesh cod ends, as the catch increases the meshes close up more and reduce water flow through the cod end, T90 helps to improve the water flow keeping the cod end more stable. this results in less damage to the catch while in the cod end due to reduced movement.
Documents
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Assessment of T90 mesh in a fishery targeting whiting in the Celtic Sea
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Reducing Drag in Towed fishing Gears - Fishing Trials to Evaluate the Performance of a trawl Constructed from T90 ('turned mesh') Netting
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Reducing Drag in Towed fishing Gears - Flume Tank Testing of a 1:10 Scale Model of the Fjardanet/Jackson T90 Trawl
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Performance of a trawl codend made from 90º turned netting (T90) compared with that of traditional codends
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Report of the Study Group on Turned 90° Codend Selectivity, focusing on Baltic Cod Selectivity (SGTCOD) 2011
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Report of the Study Group on Turned 90° Codend Selectivity, focusing on Baltic Cod Selectivity (SGTCOD) 2010
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Report of the Study Group on Turned 90° Codend Selectivity, focusing on Baltic Cod Selectivity (SGTCOD) 2009
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T90 - The gentle codend with many advantages
Selection type
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- Post-selection
Release effectiveness
Cod
Poor
Haddock
Poor
Hake
Average
Flats
Very poor
Retention effectiveness
Cod
Good
Haddock
Average
Whiting
Poor
Hake
Poor