Nephrops Underwater TV Survey FU16 Porcupine Bank

Nephrops norvegicus are common around the Irish coast, occurring in geographically distinct sandy or muddy areas where the sediment is suitable for construction of their burrow dwellings. This dataset provides quality assured estimates of Nephrops burrow densities from a randomised isometric grid of underwater television (UWTV) stations at six nautical mile spacing over the known spatial and bathymetric distribution of the FU (functional unit) 16: Porcupine Bank (illustrative shapefile provided with data). This dataset covers the period of 2012 and is ongoing. One hundred percent of the survey grid was covered in all years but 2012, where sixty-nine percent of the grid was covered (47 stations), and 2015, where no survey data are available due to research vessel breakdown. Dataset fields are Nephrops Functional Unit Number; Nephrops Ground Name; Survey Code; Year; UWTV Station number; Decimalised longitude and latitude midpoint of the UWTV station track; Adjusted density (Nephrops burrows/m²) ;Length in metres of the UWTV station track; Source of length data (USBL sled GPS, SHIP GPS, estimated GPS);Field of View in metres of camera system; Data Extraction source (SQL, MSAccess); Research Vessel Name; Correction Factor (Density / Correction Factor = Adjusted Density) and Depth (metres). Underwater TV Survey reports for this Nephrops stock are available at:http://hdl.handle.net/10793/1431 Also available is the ICES Cooperative Research Reports which details use of UWTV surveys to assess Nephrops stocks. Further details of stock assessment can found by accessing the following report: https://tinyurl.com/ices-nephrops