Marine_Scotland_FishDAC_1757 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 0805C- West coast inshore acoustic survey- Clupea cruise 0805 north minch, skye, inshore, west coast lochs,acoustic survey, seabat 6012 2016-05-10 publication Marine_Scotland_FishDAC_1757 12 daily folder of Simrad format (.ek5)acoustic data . CTD data for 39 vertical dips. minilogger data for 10 deployments. 11 surface light level files. Objectives: 1. To carry out detailed acoustic surveys in selected lochs and bays on the mainland side of the North Minch and southern Skye using the EK 500 and SEABAT to determine the distribution and abundance of juvenile 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 age-length and length-weight relationships. Herring samples will be analysed for sex, maturity, Ichthyophonus and Cryptocotyle lingua infection. Sprat samples will be analysed for Lernaeenicus sprattae, L. encrasicoli and Cryptocotyle lingua infection. Stomach samples will also be taken from both herring and sprat. 2. For each haul from which stomachs are taken a vertical plankton net dip will be carried out. 3. A series of CTDs will be carried out through each loch and bay sampled. Survey Areas: Summer Isles area/Little Loch Broom; Lochs Hourn, Kishorn, Nevis; the west of Mull including Lochs Tuath, na Keal and Scridain. 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 -7 -5 56.5 58 ICES Rectangles 1910-01-01 creation 42E3 ICES Rectangles 1910-01-01 creation 43E3 ICES Rectangles 1910-01-01 creation 42E4 ICES Rectangles 1910-01-01 creation 43E4 ICES Rectangles 1910-01-01 creation 44E4 SeaDataNet vertical extent keywords 2010-01-01 revision The entire body of water between the bed and the atmosphere. 2005-06-03 2005-06-17 https://www.bodc.ac.uk/data/information_and_inventories/cruise_inventory/search/ Reference info #0 Electronic - 13.7GB - 12 daily folder of Simrad format (.ek5)acoustic data . CTD data for 39 vertical dips. minilogger data for 10 deployments. 11 surface light level files. dataset Staff joined the Clupea in Fraserburgh on 3 June 2005, from where she sailed at 1600. She arrived in Loch Broom around midday on 4 June where an acoustic calibration was performed prior to beginning transecting. Clupea steamed to the start of the Summer Isles area transects, inside Isle Martin, on the morning of 5 June to begin acoustic transecting and pelagic trawling. Transecting and trawling continued all day in the open water area. The following day, 6 June, transecting and trawling was carried out in Little Loch Broom, and then Clupea returned to the open water area and continued transecting for the rest of the day. On 7 and 8 June, transecting and trawling in the open water of the Summer Isles area then continued. A naval exercise in the area prevented a trawl from being carried out on marks in the outer area surveyed. Clupea moved down the Loch Hourn on the morning of 9 June and worked there for the day. She then headed up to Kyle for the night to take on water and receive some supplies from Aberdeen. Transecting continued in Loch Hourn in the morning of 10 June, then Clupea moved round to Loch Nevis to begin work there. Work continued in Loch Nevis in the morning of 11 June until around 1030. Clupea then steamed down to Mull to begin work in that area. Work began in Loch Tuath around 1400 and continued for the rest of the day there. On the morning of 12 June the last piece of work in Loch Tuath was completed and transecting began in the open water to the west of Mull. The open water transects continued until the entrance to Loch na Keal was reached in mid-afternoon. Transecting began there at around 1600 and continued to the end of the working day. Work in Loch na Keal continued on the morning of 13 June. The decision was made to then work in Loch Scridain as the weather was considered to be too poor to continue the Mull open water transects and the forecast for the following day was fair. Transecting and trawling was then carried out in Loch Scridain for the rest of that day and work was completed by 1000 on 14 June. Clupea then moved back to the Mull open water transects and completed work there by 1600. Breakdown of the sonar meant that two of the transects going through shallow areas had to be shortened, by a distance of around 3 miles. Clupea then steamed for an overnight stop in Mallaig, to take on water. On the morning of 15 June she steamed for Loch Kishorn, where work commenced, until around 1600 when the surveying was cut short, two and a half transects away from the head of the loch. A buoy had been snagged and in the attempt to untangle the rope from the pole carrying the acoustic equipment the pole got badly bent, rendering further acoustic surveying impossible. Work finished in the loch around 1900 and Clupea steamed for Fraserburgh where she arrived at 1830 on 16 June 2005. Staff disembarked there at 1000 on 17 June, after unloading and debrief, and returned to Aberdeen by minibus. The light gauge recorded data throughout the cruise to determine ambient light levels. The mini-logger was deployed on the headline during each trawl, along with the Scanmar sensors. In each area and loch a CTD was carried out at the centre point of each tow. A number of CTD dips were then carried out through each loch to determine vertical structure throughout. In the Summer Isles area (including Little Loch Broom) four pelagic tows and nine CTD deployments were carried out; in Loch Hourn there were two pelagic tows and five CTD deployments; in Loch Kishorn, one pelagic tow and five CTD deployments; in Loch Nevis, zero pelagic tows and five CTD deployments and in the Mull area three pelagic tows and 16 CTD deployments were carried out. The time and position data for these tows and CTDs are in Tables 1 and 3 respectively. All areas were characterised by a lack of fish and an abundance of jellyfish, both coelenterates (primarily Aurelia aurita and Cyanea capillata) and ctenophores (most likely Pleurobrachia pileus). In 7 of the 10 hauls, jellyfish comprised more than 98% of the catch (Table 2). In only 1 haul (off the west coast of Mull) were fish the dominant component of the catch (85%). Many of the fish were young-of-the-year and have been retained for identification.