Marine_Scotland_FishDAC_1711 eng dataset Scottish Government (Marine Scotland) +44 (0)300 244 4000 marinescotland@gov.scot pointOfContact 2019-10-22 MEDIN Discovery Metadata Version 2.3.7 urn:ogc:def:crs:EPSG::4326 OGP HERAS - 0815S - Herring acoustic survey 2015 - North Sea and west of Scotland - Scotia HERAS, Herring Acoustic Survey 2016-03-29 publication Marine_Scotland_FishDAC_1711 Daily folders (17) of Simrad format (.raw) acoustic data. 17 Echoview format (EV) format analysis files. FSS format biological data for 33 pelagic hauls. CTD data for 32 vertical dips. Continual Thermosalinograph data. Continual AGDS data. continual hydrophone recordings for Cetaceans. Objectives:To conduct an acoustic survey to estimate the abundance and distribution of herring in the north western North Sea and north of Scotland between 58º30’-62ºN and from 4ºW to 2ºE.To obtain biological samples for echosounder trace identification using a pelagic trawl.To test feasibility of using GoPro cameras mounted in the net and on a dropframe to further aid in species identification in the echogram scrutiny process.To obtain samples of herring for biological analysis, including age, length, weight, sex, maturity and ichthyophonus infection.To obtain hydrographic data for comparison with the horizontal and vertical distribution of herring. To obtain acoustic recordings of cetaceans during the survey using a towed hydrophone system. Scottish Government (Marine Scotland) +44 (0)300 244 4000 Mailpoint 11, Area 1B South, Victoria Quay Edinburgh EH6 6QQ United Kingdom marinescotland@gov.scot pointOfContact Scottish Government (Marine Scotland) +44 (0)300 244 4000 Mailpoint 11, Area 1B South, Victoria Quay Edinburgh EH6 6QQ United Kingdom marinescotland@gov.scot custodian Scottish Government (Marine Scotland) +44 (0)300 244 4000 Mailpoint 11, Area 1B South, Victoria Quay Edinburgh EH6 6QQ United Kingdom marinescotland@gov.scot distributor Aberdeen University +44 1224 272 000 King's College Aberdeen AB24 3FX United Kingdom s.piertney@abdn.ac.uk originator Marine Scotland +44 (0)300 244 4000 1B South, Victoria Quay Edinburgh EH6 6QQ United Kingdom marinescotland@gov.scot originator Marine Scotland Science 375 Victoria Road Aberdeen AB11 9DB United Kingdom marinescotland@gov.scot originator Not Planned Marine Environmental Data and Information Network Acoustic backscatter in the water column Cetacean abundance Cetacean behaviour Fish abundance in water bodies Fish biomass in water bodies Fish morphology, age and physiology SeaDataNet Parameter Discovery Vocabulary 2018-12-12 revision Acoustics Biota composition Water column temperature and salinity SeaDataNet Agreed Parameter Groups 2017-05-03 revision Open Government License (http://www.nationalarchives.gov.uk/doc/open-government-licence/) otherRestrictions no limitations to public access 55000.00 eng oceans -4 2 58.5 61.5 ICES Rectangles 1910-01-01 creation 46E6 ICES Rectangles 1910-01-01 creation 47E6 ICES Rectangles 1910-01-01 creation 48E6 ICES Rectangles 1910-01-01 creation 49E6 ICES Rectangles 1910-01-01 creation 46E7 ICES Rectangles 1910-01-01 creation 47E7 ICES Rectangles 1910-01-01 creation 48E7 ICES Rectangles 1910-01-01 creation 49E7 ICES Rectangles 1910-01-01 creation 50E7 ICES Rectangles 1910-01-01 creation 46E8 ICES Rectangles 1910-01-01 creation 47E8 ICES Rectangles 1910-01-01 creation 48E8 ICES Rectangles 1910-01-01 creation 49E8 ICES Rectangles 1910-01-01 creation 50E8 ICES Rectangles 1910-01-01 creation 51E8 ICES Rectangles 1910-01-01 creation 46E9 ICES Rectangles 1910-01-01 creation 47E9 ICES Rectangles 1910-01-01 creation 48E9 ICES Rectangles 1910-01-01 creation 49E9 ICES Rectangles 1910-01-01 creation 50E9 ICES Rectangles 1910-01-01 creation 51E9 ICES Rectangles 1910-01-01 creation 46F0 ICES Rectangles 1910-01-01 creation 47F0 ICES Rectangles 1910-01-01 creation 48F0 ICES Rectangles 1910-01-01 creation 49F0 ICES Rectangles 1910-01-01 creation 50F0 ICES Rectangles 1910-01-01 creation 51F0 ICES Rectangles 1910-01-01 creation 46F1 ICES Rectangles 1910-01-01 creation 47F1 ICES Rectangles 1910-01-01 creation 48F1 ICES Rectangles 1910-01-01 creation 49F1 ICES Rectangles 1910-01-01 creation 50F1 ICES Rectangles 1910-01-01 creation 51F1 SeaDataNet vertical extent keywords 2010-01-01 revision The entire body of water between the bed and the atmosphere. 2015-06-25 2016-07-14 https://www.bodc.ac.uk/data/information_and_inventories/cruise_inventory/search/ Reference info #0 Electronic - 29.6GB - Daily folders (17) of Simrad format (.raw) acoustic data. 17 Echoview format (EV) format analysis files. FSS format biological data for 33 pelagic hauls. CTD data for 32 vertical dips. Continual Thermosalinograph data. Continual AGDS data. Continual hydrophone recordings for Cetaceans.Recordings and sighting data for cetaeceans resides with Aerdeen University., Database - 33 deployment records, 15 species catch and length recrods, 1988 biological samples - csv and web page dataset Sampling and Fishing gear: Midwater trawls PT160 Multisampling pelagic cod-end with one fine mesh cod-end. Seabird 19plus CTD GoPro cameras x 2 with underwater housings and lights Scanmar trawl eye sensor Towed Hydrophone array. Objectives:To conduct an acoustic survey to estimate the abundance and distribution of herring in the north western North Sea and north of Scotland between 58º30’-62ºN and from 4ºW to 2ºE.To obtain biological samples for echosounder trace identification using a pelagic trawl.To test feasibility of using GoPro cameras mounted in the net and on a dropframe to further aid in species identification in the echogram scrutiny process.To obtain samples of herring for biological analysis, including age, length, weight, sex, maturity and ichthyophonus infection.To obtain hydrographic data for comparison with the horizontal and vertical distribution of herring.To obtain acoustic recordings of cetaceans during the survey using a towed hydrophone system. Acoustic data will be collected at four frequencies (18, 38, 120 and 200 kHz) between 03:00 and 23:00 hours. Fish shoals seen on the echosounder will be identified using a pelagic trawl (PT160). Survey trawling operations will be carried out between two and four times per day at any time between 03:00 and 23:00 using the standard PT160 trawl. Where dispersed or layered aggregations are seen, the multisampler cod end may be used unless large aggregations are present in the area. Samples of all species caught will be measured for length to partition the echo integral amongst species and size classes for target strength functions. Fish will also be weighed to establish a length-weight relationship. Otoliths will be collected from a sub-sample of the herring according to the following length stratified scheme to determine age; two per 0.5 cm class below 22 cm, five per 0.5 cm class from 22.5-27.5 cm and ten per 0.5 cm class for 28.0 cm and above. For each herring in the subsample the state of maturity, gonad weight, liver weight, whole and gutted weight, presence of food in the stomach as well as the presence of Icthyophonus infection will be recorded. The maturity scale used throughout the survey will be the Scottish 8 stage scale. A GoPro camera and underwater lights will be mounted in the trawl as required to aid in species identification in the echogram scrutiny process by delivering additional information on time of capture of and composition of the catch. Where traces are seen in untrawlable areas, a GoPro camera may be deployed manually on a small drop frame to investigate the feasibility of using this technique to verify species composition of echosounder traces. This exercise will be conducted with the vessel in DP. A towed hydrophone will be deployed over the stern roller during survey transects. The hydrophone will remain deployed while the vessel is at survey speed but will be recovered prior to commencement of fishing operations and environmental sampling. Where required, a vertical hydro dip will be carried out immediately following a pelagic trawl, this will require the vessel to use its DP system to remain on station. The decision to carry out vertical dips will be based on the requirement to achieve one station in each ICES rectangle. The ships thermosalinograph will be run continuously to obtain sea surface temperature and salinity throughout the survey area.