Survey : CLIONE 11/70 (part of CEFAS Historic surveys)

This survey was undertaken by Cefas as part of the CEFAS Historic surveys; Station and biological data collected during research surveys carried out by Cefas (formerly Directorate of Fisheries) in seas around the UK, mostly in the North Sea, since 1902. The survey hauls are not laid out systematically as a grid, as in current International Bottom Trawl Surveys (IBTS) and are widely distributed over (especially) southern and central North Sea areas. Gears and protocols were not standardised throughout, due to the long term nature of the series. Surveys took place in each season. Data are lacking for the periods of both World Wars. In some periods (e.g. the early 1900s), all species caught were recorded, whereas in other periods (e.g. 1920s-30s), only the key commercial species (e.g., Plaice, Sole and Cod) were recorded systematically. Note that some surveys targeted particular species (notably Plaice). Survey took place between 27/08/1970 and 06/09/1970 on Clione Equipment used during this survey : - Granton 60mm Cod End Bunt and Door Chains Codend Catch - Granton 60mm Cod End Bunt and Door Chains Cover Catch - Granton 60mm Cod End Bunt Chain Codend Catch - Granton 60mm Cod End Bunt Chain Cover Catch - Granton 60mm Cod End No Chains Codend Catch - Granton 60mm Cod End No Chains Cover Catch - Original Petersen Grab - Otter Trawl 78ft Granton with door to door chain and 60mm codend - Otter Trawl 78ft Granton with door to door chain and 60mm codend cover only Survey operations were undertaken on 56 stations 28 different species were caught on this survey