RV Cefas Endeavour 12/17
Cruise summary report
|Ship name (ship code)||RV Cefas Endeavour (74E9)|
|Cruise period||2017-06-19 — 2017-06-26|
|Port of departure||Lowestoft, United Kingdom|
|Port of return||Lowestoft, United Kingdom|
1. Conduct a standard underwater TV survey of Nephrops burrow densities on the Farn Deeps grounds, 55 35N - 54 45N and 01 30W - 00 40W, and to evaluate Nephrops abundance (110 stations).
2. Conduct seabed multibeam survey (at each TV survey station).
3. Secondary: Conduct a standard underwater TV survey of additional stations if time allows.
The survey was multi-disciplinary in nature collecting UWTV, backscatter data and other ecosystem data. The survey design consists of a randomised fixed grid of 110 stations where at each station a sledge mounted TV camera is deployed and a clear 10 minute tow is recorded digitally. In June 2017, 110 stations (TVID) were successfully surveyed in the Farn Deeps area with the TV sledge, from 19 Jun to 26 Jun. In addition to these stations an additional 16 exploratory stations were completed. No time was lost due to weather conditions and the water clarity was good to excellent throughout the footage recorded. 24 hours were lost due to damage to the camera cable, requiring a mechanical and electrical termination. Burrows were counted by each minute block for 7 clear minutes. The counting performance of the 2017 counters was generally very high, with a Linn's CCC scored average of 0.66. Preliminary results show that the abundance has increased since last year, with abundance now just above the Btrigger threshold as determined by ICES. As with previous years the high abundance area is distributed in the west side of the ground.
|Chief scientist||Robin Masefield (Centre for Environment, Fisheries and Aquaculture Science Lowestoft Laboratory)|
|Cruise programme||(0.48 MB)|
|Cruise report||(1.23 MB)|