1. To carry out commercial gear handling trials with centrally hinged polyamide grids (Eurogrids).
2. To obtain selectivity estimates for whitefish grids with 30 mm bar spacing and 100 mm cod-ends.
3. To obtain videofilm of deck handling procedures.
Weather conditions deteriorated and both vessels entered Lerwick on 8 December to change gear. Attempts were made to obtain a replacement board for the faulty Scanmar cabinet but without success so Illustrious was required to log grid angle data in addition to other gear performance parameters on all subsequent hauls.
G I Sangster (Fisheries Research Services Aberdeen Marine Laboratory)
Biology and fisheries
Quantity: number of hauls = 21 Description: 10 with Case 1, 11 with Case 2. 5 hauls were considered invalid. Haul length was reduced from 4 hours to 2 hours towing. Rope lengths and chain bridles were also shortened