Marine_Scotland_FishDAC_1728 eng dataset Scottish Government (Marine Scotland) +44 (0)300 244 4000 marinescotland@gov.scot pointOfContact 2016-05-03 MEDIN Discovery Metadata Version 2.3.7 urn:ogc:def:crs:EPSG::4326 OGP 1106S HERAS North sea herring acoustic survey-Scotia cruise 1106S HERAS, north sea, herring acoustic survey, 1106S 2016-04-07 publication Marine_Scotland_FishDAC_1728 Daily folders (20) of Simrad format (.raw) acoustic data. 20 daily folders of acoustic data (.ek5 format) from autonomous echo-sounder. Data from Holographic camera system held by AU.20 Echoview format (EV) format analysis files. Excel biological data for 40 pelagic hauls. CTD data for 48 oblique deployments. Excel data for 48 plankton dips. Continual AGDS data. Objectives 1. To conduct an acoustic survey to estimate the abundance and distribution of herring in the north western North Sea and north of Scotland between 58º15-61.45’N and 4ºW to 2ºE, excluding Faroese waters. 2. To obtain biological samples for echosounder trace identification using a pelagic trawl. 3. To obtain samples of herring for biological analysis, including age, length, weight, sex, maturity, ichthyophonus infection and fat content. 4. To obtain hydrographic data for comparison with the horizontal and vertical distribution of herring. 5. To obtain plankton samples map the distribution and abundance of zooplankton. 6. To test the multisampling pelagic cod-end. 7. To test FRS’ new Methot Isaacs Kidd nets. 8. To obtain holographic images of the low frequency scattering layer. 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 Not Planned Marine Environmental Data and Information Network Acoustics Biota composition Fish Water column temperature and salinity Zooplankton SeaDataNet Agreed Parameter Groups 2010-10-23 revision Acoustic backscatter in the water column Fish abundance in water bodies Fish biomass in water bodies Fish morphology, age and physiology Water column photography BODC Parameter Discovery Vocabulary 2011-03-25 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 57 62 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 44E7 ICES Rectangles 1910-01-01 creation 45E7 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 43E8 ICES Rectangles 1910-01-01 creation 44E8 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 43E9 ICES Rectangles 1910-01-01 creation 44E9 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 52E9 ICES Rectangles 1910-01-01 creation 43F0 ICES Rectangles 1910-01-01 creation 44F0 ICES Rectangles 1910-01-01 creation 45F0 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 52F0 ICES Rectangles 1910-01-01 creation 43F1 ICES Rectangles 1910-01-01 creation 44F1 ICES Rectangles 1910-01-01 creation 45F1 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 ICES Rectangles 1910-01-01 creation 52F1 SeaDataNet vertical extent keywords 2010-01-01 revision The entire body of water between the bed and the atmosphere. 2006-07-01 2006-07-21 https://www.bodc.ac.uk/data/information_and_inventories/cruise_inventory/search/ Reference info #0 Electronic - 37.7GB - Daily folders (20) of Simrad format (.raw) acoustic data. 20 daily folders of acoustic data (.ek5 format) from autonomous echo-sounder. 20 Echoview format (EV) format analysis files. Excel biological data for 40 pelagic hauls. CTD data for 48 oblique deployments. Excel data for 48 plankton dips. Data from holographic camera system held by AU. Continual AGDS data. dataset All gear was loaded in Aberdeen on 28 June. Scientific staff joined the vessel at 08:00 UTC on 01 July and it departed at 09:30 on the same day. A small meeting was held with all scientists to explain the objectives of the survey and to describe general operating procedures. The survey commenced just outside Aberdeen at 10:00 on 01 July. Transects progressed northwards along lines of latitude, at spacings of 15 or 7.5 nautical miles (n.mi.). Transect spacing was based on the results of previous surveys and transects were placed relative to ICES rectangles. Transects extended as far east as 1° 45E, and as far as safely possible to the west on approaching the coast. Calibration of all four transducers took place in Scapa Flow in the early hours of the morning of Tuesday 4 July and the survey resumed afterwards at 09:35 of the same day. A half landing took place on 11 July in Lerwick in accordance with rest provision for the working time directive and for the exchange of personnel (Alex Brown and Palap Tiptus for Nick Burns and Hongyue Sun). The vessel resumed surveying at 11:00 on 12 July. West of the Shetland Isles, transects extended from the coast to the shelf edge or longitude 4° west. The survey was completed on 20 July at 12:45. All four transducers were calibrated successfully once again in Scapa Flow on 20 July. The vessel returned to Aberdeen on the morning of 21 July. 2.3 Survey design The survey track (Fig IID.1) was selected to cover the area with three levels of sampling intensity based on agreed boundaries to the east, west and south, and the limits of herring densities found in previous years to the north and Northwest. A transect spacing of 15 nautical miles was used in most parts of the area with the exception of areas to the east of Shetland where short additional transects were carried out at 7.5 n.mi. spacing and the area south of 58° 30’N where 30 nmi transect spacing was used. On the administrative boundaries of 2oE the ends of the tracks were positioned at twice the track spacing from the area boundary, giving equal track length in any rectangle within the area. The between track data was then included in the data analysis. Transects at shelf break were continued to the limits of the stock and the transect ends omitted from the analysis. Transects at the coast were continued as close inshore as practical, those on average less than half a transect spacing from the coast were excluded from the analysis, those at greater distance were included in the analysis. The origin of the survey grid was selected randomly within a 15 n.mi. interval the track was then laid out with systematic spacing from the random origin. Where the 7.5 and 30 n.mi. transect spacing was used the same random origin was used (as a proportion of the intertansect space). Finally, at the request of the Dutch, an additional two ICES rectangles were sampled (45F0 and 45F1): these were sampled using a zig-zag design to minimise the passage time back to the Scotia’s survey track (see Figure IID.1). 2.4 Calibration Two calibrations were carried out of the EK60 echosounder system used during the survey: one near the beginning of the survey on 4 July in Scapa Flow and one at the end of the survey on 20 July in Scapa Flow. Standard sphere calibrations were carried using 38.1mm diameter tungsten carbide sphere for 18, 38, 120 and 200 kHz. Agreement between the calibrations for 38 kHz was approximately 0.1dB. The calibration settings and results for 38kHz are given in Table IID.1. 2.5 Acoustic data collection The acoustic survey on FRV Scotia was carried out using a Simrad EK60 multifrequency echosounder with all four transducers (18, 38, 120 and 200 kHz) mounted on the drop keel. For most of the survey the keel was kept at 3m extension placing the transducer at 8.5m depth. Data was archived for further data analysis which was carried out using Sonardata Echoview software and Marine Lab Analysis systems. Data were collected from 0200 to 2200 GMT. A total of 2255 n.mi. were surveyed and included in the analysis. 2.6 Biological data - fishing trawls A total of 40 trawl hauls (positions shown in Fig IID.1) were carried out during the survey on the denser echo traces. The fishing gear used throughout the survey was the PT160 pelagic trawl; in the latter half of the survey this was augmented by the addition of a three cod-end multisampling trawl. Each haul was monitored using a Simrad FS903 scanning netsonde. The catch from each haul was sampled for length, age, maturity and weight of individual herring. In addition weights of gonads and livers were also collected. Between 250 and 500 fish were measured at 0.5 cm intervals from each haul. Otoliths were collected with one per 0.5 cm class below 20.5 cm, three per 0.5cm class from 21-25.5cm and ten per 0.5 cm class for 26.0 cm and above. The same fish were sampled for whole weight, gonad weight, liver weight, sex, maturity, stomach contents and macrosco