Marine_Scotland_FishDAC_1734 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 1500C West coast lochs - small pelagics acoustic survey - Clupea cruise 1500C Herring, Sprat, small pelagics, acoustic survey, West coast, sea lochs 2016-04-26 publication Marine_Scotland_FishDAC_1734 Daily folders (8) of Simrad format (.ek5) acoustic data. Continual AGDS data. Objectives 1. To sample fish using the BT 154 International gadoid trawl with 6 mm cod-end. 2. To use the modified 5 m beam trawl to sample bottom living species. 3. To carry out detailed acoustic surveys in selected sealochs using the Seabat 602 and RoxAnn. 4. To carry out grab sampling for benthic organisms and ground truthing RoxAnn. Sea Lochs Surveyed Loch Gairloch, Outer/Inner Loch Torridon, Loch Kishorn, Loch Duich, Loch Hourn and Loch Nevis. 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. 2000-10-20 2000-11-06 https://www.bodc.ac.uk/data/information_and_inventories/cruise_inventory/search/ Reference info #0 Electronic - 700MB - Daily folders (8) of Simrad format (.ek5) acoustic data. Continual AGDS data. dataset Clupea sailed from Fraserburgh at 1100 hours on Monday 23 October. P Copland travelled round with the ship to Gairloch, where the remainder of the scientific staff joined C/upea at 1400 hours on Tuesday 24th. Trials of the modified beam trawl were conducted in Loch Gairloch duringthe afternoon of the 24th. Westerly gales on the 25th and 26th prevented further work in Loch Gairloch. Clupea sailed for Inner loch Torridon on the morning of the 26th. Acoustic surveys were carried out in Inner and Outer lochs Torridon and Shieldaig using Seabat and RoxAnn. Grab samples were taken at selected locations. Beam trawling was carried out with limited success due to the large numbers of creels in each of the lochs. C/upea left Torridon on the 28th and headed for Loch Kishorn. Creels were again a problem and prevented the shooting of the Pelagictrawl. However, the beamtrawl was deployedwhere space allowed. Clupea docked at Kyle onthe evening of the 28th. Severe galesfor the nexttwo days prevented any further work. I Young joined C/upea on the evening of the 29th. Clupea sailed for Loch Duich on the 30th. Although creels were present in the loch there was sufficient space to deploy the Pelagic netsuccessfully for the first time. The trawl and acoustic survey in Loch Duich, was completed by the evening of the•30th, before proceeding to Lochs Hourn and Nevis where similar surveys were carried out from 31 October - 3 November before Clupea returned to Kylewhere the scientific staff disembarked on the 4th and Clupea returned to Fraserburgh for unloading on the 6th. Results Areas covered by the RoxAnn and Seabat survey are shown on the charts with trawl and grab positions also indicated. Fourteen beam trawls and 10 trawls with the PT154 were completed. Where possible each haulwas of 30 minutes duration. Haul details are shown in Table1. Total numbers of main species captured are shown in Table 2. All hauls were sampled according to standing instructions. The most common species caught when fishing in midwater layers in Lochs Duich, Hourn and Neviswere Sprat and Euphausids. The Seabat also identified similar marks in Lochs Torridon, Shieldaig and Kishorn, but due to the proximity of creels it was not possible to identify species type by trawling. The Ghost shrimp Pasipheasp. was also present , being found predominantly in the bottom 10 metres. When fished close to the bottom the PT 154 captured mainly small Whiting (9-23 cm), Pout (8-17 cm) and Herring (9-15 cm). One haul (PT8) shot at the entrance to Loch Nevis contained significant numbers of small Haddock (9-23 cm). Samples of Herring and Sprat were retained for DNA analysis. Herring were examined for sex (43% females) and maturity ( all stage 1). Samples were also examined for lcthyophonus - none was found. Stomach contents examined showed that Euphausids were the major food source for the Whiting, Haddock and Pout. All the Herring and Sprat samples examined had empty stomachs.