RV Cefas Endeavour 12/14
Cruise summary report
|Ship name (ship code)||RV Cefas Endeavour (74E9)|
|Cruise period||2014-06-08 — 2014-06-15|
|Port of departure||Lowestoft, United Kingdom|
|Port of return||Lowestoft, United Kingdom|
1. To conduct a standard underwater TV survey of Nephrops burrow densities on the Farn Deeps grounds, 55 35' - 54 45' N and 1 30' - 0 40' W, and to evaluate Nephrops abundance.
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 onto DVD and DVT. In June 2014, 110 stations (TVID) were successfully surveyed in the Farn Deeps area with the TV sledge and multibeam, from 8 Jun to 15 Jun. No time was lost due to weather conditions and additionally the water clarity was very good to excellent throughout the footage recorded. Burrows were counted by each minute block for 7 clear minutes. The counting performance of the 2014 counters was generally very high, with a Linn's CCC scored average of 0.73. The resulting krigged burrow abundance estimate was 757 million burrows. This was a similar result of that obtained in 2012, and slightly higher than the abundance in 2013. As previous years the high abundance area is distributed in the east side of the ground. Overall densities remain low and abundance remains bellow MSY Btrigger. The CV (or relative standard error) for this survey was of around 3% which is in line with previous estimates and well below the upper limit of 20% recommended by SGNEPS 2012.
|Chief scientist||Ana M Leocadio (Centre for Environment, Fisheries and Aquaculture Science Lowestoft Laboratory)|
|Cruise report||(1.25 MB)|