Marine_Scotland_FishDAC_1745 eng dataset Scottish Government (Marine Scotland) +44 (0)300 244 4000 marinescotland@gov.scot pointOfContact 2016-05-19 MEDIN Discovery Metadata Version 2.3.7 urn:ogc:def:crs:EPSG::4326 OGP 0103C-West coast lochs, small pelagics acoustic survey-Clupea cruise 0103 herring, sprat, west coast lochs, acoustic survey, Clupea, 0103C 2016-05-05 publication Marine_Scotland_FishDAC_1745 Paper records of: EK500 echogram print outs. Haul summary sheets with biological data for each of 9 pelagic, 17 demersal and 8 beam trawls. Excel biological data for 9 pelagic hauls. Sampling Gear and Equipment Modified PT154 with 6 mm codend BT158 demersal trawl with 1O mm codend 2.8 m beam trawl with spare beam Scanmar (Height and spread units) 2 Day grabs Simrad EK500 /RoxAnn CTD Objectives Part 1 1. To carry out detailed acoustic surveys in selected lochs, and the Sound of Sleat, using the EK 500 and RoxAnn to determine the distribution of herring and sprat. Concentrations of pelagic fish will be sampled using the PT154. Species composition and length-frequency distributions of the fish caught will be determined. Sub-samples will be weighed and otolithed to establish length-weight relationships and age structure. Herring samples will be analysed for sex, maturity and lchthyophonus infection. Stomachs, DNA samples and photographs will also be taken from selected samples for the EU projects AQCESS, HERGEN and WESTHER. ,. Part 2 2. To carry out demersal trawls in each of the sea lochs to determine the abundance, distribution and variation of fish species and any epibenthic mega-fauna using the BT158 trawls and the 2.8 m beam trawl where appropriate. At each trawl station the length-frequency of all species will be taken and sub-samples of the major commercial species will be weighed and otolithed. Stomach contents will be removed from selected species for trophic studies. 3. Five grab samples will be taken before trawling, at each of the demersal trawl stations. A CTD will also be done at both pelagic and demersal trawl positions. 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 Scottish Government (Marine Scotland) +44 (0)300 244 4000 Mailpoint 11, Area 1B South, Victoria Quay Edinburgh EH6 6QQ United Kingdom marinescotland@gov.scot originator Not Planned Marine Environmental Data and Information Network Acoustics Biota composition Fish Water column temperature and salinity 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 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 -6 -5 57 57.5 ICES Rectangles 1910-01-01 creation 43E4 SeaDataNet vertical extent keywords 2010-01-01 revision The entire body of water between the bed and the atmosphere. 2003-01-06 2003-01-25 https://www.bodc.ac.uk/data/information_and_inventories/cruise_inventory/search/ Reference info #0 Electronic - 21MB - Excel biological data for 9 pelagic hauls., Paper - 3 folders - Paper records of: EK500 echogram print outs. Haul summary sheets with biological data for each of 9 pelagic, 17 demersal and 8 beam trawls. dataset Clupea sailed from Fraserburgh on 6 January 2003, arriving in Kyle the following day where the scientific staff joined the ship. Clupea steamed to anchor in Balmacara Bay where the acoustics system was calibrated prior to the start of the survey. Acoustic transecting and pelagic trawling began the next day in Loch Nevis. A problem with the 38 kHz transducer required re-calibration for that transducer. This was carried out on the evening of 8 January 2003. Acoustic transecting and pelagic trawling was resumed the next day and carried out in Lochs Hourn; Duich and Kishorn. CTDs were carried out for each pelagic trawl haul. Work was limited to acoustic transecting in Lochs Alsh and Duich on 14 January 2003 due to increasingly inclement weather. 15 January 2003 was lost to work due to severe weather conditions and C/upea remained alongside at Kyle. Scientific staff changed over on 16 January 2003. • Part 2 The change over of scientific staff and fishing gear took place at Kyle on 16 January. Due to severe weather conditions Clupea did not start work until the following day when she steamed to Loch Kishorn to begin the survey. Weather conditions continued to hamper work and trawling was only possible in the outer loch. Clupea then proceeded to Loch Duich where the designated grabs and one trawl were completed before poor light conditions prevented further work due to the difficulty in seeing creel floats. Clupea returned to Kyle for the night. The following morning C/upea returned to Loch Duich to complete the trawling and to lift a mooring for the sonar team, before steaming to Loch Hourn where grabbing continued until dusk. Demersal trawling, beam trawling and CTDs were completed the next day in Loch Hourn. Clupea then steamed to Loch Nevis where the sequence of mud grabs, trawling and CTDs were repeated. Exploratory trawling was also carried out on suitable ground of Armadale cin the south-east side of Skye, before returning to Loch Nevis and Loch Hourn on 21 January where a series of repeat trawls were carried out in each loch to reinforce the data already collected. An exploratory haul was also carried out on hard ground in Loch Alsh. The next day trawling and grabbing were completed in Loch Kishorn and additional repeat trawls were carried out in Loch Duich. On 23 January exploratory beam trawling was carried out in Loch Alsh, poor weather preventing fishing elsewhere. With all the work completed Clupea finished at Kyle on the afternoon of 23 January where scientific staff disembarked and the ship proceeded to Fraserburgh. Results Part 1 Nine pelagic tows were completed during the trip and sampling undertaken according to protocol. A problem with one of the signal processing boards meant that two acoustic frequencies (38 and 120 kHz) were used during this trip, as opposed to the usual three (38, 120 and 200). However, 38 and 120 kHz are the more commonly examined in analysis and post-processing. CTDs were taken at the centre point of each pelagic tow. Extra sampling was completed in three lochs for the EU projects HERGEN and WESTHER. Part 2 Seventeen demersal and eight beam trawls were completed during the trip and sampling undertaken according to the protocol. Forty grab samples were taken and sieved through 2 mm and 1 mm mesh, the samples being retained for later identification. Mud samples were also taken at each grab station for particle analysis. CTD and water samples were taken routinely at each trawl station. Positions for the pelagic tows (part 1) and demersal tows (part 2) are detailed in the attached table. A detailed species list has also been drawn up for each loch. Analysis of the samples is underway and will be reported at a later date as part of the AQCESS project.