Marine_Scotland_FishDAC_1756 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 1704C- West coast lochs-small pelagics acoustic survey- Clupea cruise 1704 herring, sprat, west coast sea lochs, acoustic survey 2016-05-10 publication Marine_Scotland_FishDAC_1756 Daily folders (10) of Simrad format (.ek5) acoustic data. Excel biological data for 13 pelagic hauls. CTD data for 21 vertical dips. 7 daily files of minilogger data. 9 folders of surface light level data. Objectives: 1. To carry out detailed acoustic surveys in selected lochs and the North Minch (if time allows) using the EK 500 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, to establish length-weight relationships, and otolithed. Herring samples will be analysed for sex, maturity and Ichthyophonus infection. Stomach, gonad and DNA samples will also be taken. Herring and sprat will be examined for Cryptocotyle lingua infection. Sprat will also be examined for Lernaeenicus sprattae and L. encrasicoli infection. 2. A line of CTDs will be done through each loch. Survey Areas: Main survey areas - Loch Duich, Loch Hourn, Loch Kishorn, Loch Nevis. Secondary survey areas - North Minch, Sound of Sleat. 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 58 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. 2004-11-17 2004-12-02 https://www.bodc.ac.uk/data/information_and_inventories/cruise_inventory/search/ Reference info #0 Electronic - 9.2GB - Daily folders (10) of Simrad format (.ek5) acoustic data. Excel biological data for 13 pelagic hauls. CTD data for 21 vertical dips. 7 daily files of minilogger data. dataset Clupea sailed from Fraserburgh on 20 November 2004, after a 72 hour delay due to bad weather. She arrived in Kyle on 21 November where staff joined the ship at 1630 h. She remained tied up alongside at Kyle until the morning of 22 November due to further bad weather. The usual acoustic calibration performed prior to transecting was unable to be performed due to the weather. Clupea steamed to Loch Hourn on the morning of 22 November to begin acoustic transecting and pelagic trawling. Very low concentrations of fish prompted the decision to transect in Loch Nevis on 23 November, and Loch Hourn was returned to and surveyed again on 24 November. Transecting was carried out on the flood tide on both days in Loch Hourn and in Loch Nevis. Loch Duich was surveyed on 25 November and 27 November, and Loch Carron on 26 November. In these two lochs it was possible to transect on both ebb and flood tides, and over the two days in Loch Duich, and one day in Loch Carron, transecting was able to be performed during two ebb and two flood tides. Clupea then returned to Loch Nevis and worked there during on 28 November, transecting and fishing this time during an ebb tide. On 29 November Clupea returned to Loch Hourn to carry out a third day of transecting there, this time during an ebb tide. This gave surveys across one ebb tide and two flood tides for Loch Hourn and two of each for Loch Duich. Clupea then steamed to Loch na Dal in the late afternoon of 29 November where the acoustic system was calibrated. A fourth day of work had originally been planned for Loch Hourn was dropped, due to the unusually low concentrations of fish there. A good weather forecast was given for the last couple of days of the survey. This, coupled with the extra day available due to dropping the fourth day in Loch Hourn, gave the first opportunity to work in the North Minch. Clupea called briefly at Kyle on the early morning of 30 November, where E Hatfield and C Wylie disembarked. She then sailed up through Raasay Sound and transected across the North Minch and back to Loch Broom and tied up alongside at Gairloch overnight. Four further transects were performed on 1 December, ending at Cape Wrath. Clupea then returned to Fraserburgh overnight, arriving on the morning of 2 December, when the scientists disembarked. 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 loch a CTD was carried out at the centre point of each tow (unless several tows covered the same area in which case one CTD was used to provide data for the different tows). A number of CTD dips were then carried out through the rest of each loch to determine vertical structure throughout. In Loch Carron two pelagic tows and four CTD deployments were carried out; in Loch Duich five pelagic tows and five CTD deployments were carried out; in Loch Hourn three pelagic tows and five CTD deployments were carried out; in Loch Nevis three pelagic tows and seven CTD deployments were carried out. No pelagic tows or CTD deployments were carried out in the North Minch. The time and position data for these tows and CTDs are in Tables 1 and 2 respectively. Samples for the WESTHER project were taken in Loch Carron (due to the lack of fish in Loch Hourn – the usual sampling area).