To compare the selection characteristics for roundfish in 90mm cod-ends with 90mm square mesh windows using two types of small mesh cover.
To study a trawl modified to retain whiting separated from haddock using 90mm square mesh window panel fitted to the top side of a 90mm meshed cod-end and part of the extension; small mesh covers will also be fitted.
John Main (Scottish Office Agriculture and Fisheries Department Aberdeen Marine Laboratory)
Moray Firth or Orkney Islands
Biology and fisheries
Quantity: number of hauls = 24 Description: groundfish survey.
Other biological/fisheries measurement
Quantity: number of hauls = 3 Description: comparing cod-end catches, with and without covers.