Marine_Scotland_FishDAC_1750
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
1903C -West coast lochs, small pelagics acoustic survey- Clupea cruise 1903
Herring, sprat, west coast lochs, acoustic survey, Clupea 1903
2016-05-06
publication
Marine_Scotland_FishDAC_1750
Daily folders (8) of Simrad format (.raw) acoustic data. Excel biological data for 16 pelagic hauls. CTD data for 21 vertical dips. Minilogger data for 16 deployments. surface light level data from 8 files.
Objectives
1. To carry out detailed acoustic surveys in selected lochs, the Sound of Sleat and North Minch (if time allows) 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. Herring samples will be analysed for sex, maturity and lchthyophonus infection. Stomach, gonad and DNA samples will also be taken.
2. A line of CTDs will be done through each loch.
Survey Areas
Main survey areas - Loch Kishorn, Loch Alsh, Loch Duich, Loch Hourn, Loch Nevis. Secondary survey areas - Sound of Sleat, North Minch.
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.
2003-11-17
2003-12-01
https://www.bodc.ac.uk/data/information_and_inventories/cruise_inventory/search/
Reference info #0
Electronic - 710MB - Daily folders (8) of Simrad format (.raw) acoustic data. Excel biological data for 16 pelagic hauls. CTD data for 21 vertical dips. Minilogger data for 16 deployments. surface light level data from 8 files.
dataset
Clupea sailed from Fraserburgh on 17 November 2003, and was delayed en route due to weather for some 36 hours. After 24 hours in Loch Eriboll she sailed to Kyle and arrived on 19 November where staff joined the ship at 1700. Clupea steamed to anchor in Loch na Beiste where the acoustic system was calibrated prior to the start of the survey. Acoustic transecting and pelagic trawling began the next day in Loch Hourn and continued there for two days. Transecting was carried out on the flood tide on both days in Loch Hourn. It became apparent that the CTD Seabird 911 plus was not communicating with the software
so Clupea returned to Kyle on the evening of '21 November to pick up the Seabird 19 CTD that had been• brought over to Kyle by a lab driver. Loch Kishorn was surveyed on 22 November and Loch Duich on 23 and 24 November. In each of these lochs it was
possible to transect on both ebb and flood tides. In Loch Kishorn only one of each tides were covered whereas in Loch Duich transecting was able to be performed during two ebb and two flood tides. Clupea returned to Loch Hourn and worked there during 25 November, transecting and fishing this time during an ebb tide. Loch Nevis was surveyed during 26 and 27 November during the ebb tide. Loch Hourn' was surveyed again on 28 November, again during the ebb tide, giving surveys across two ebb tides and two flood tides for both Loch Duich and Loch Hourn. The work that had been planned in the North Minch, comprising a couple of acoustic transects, from Skye across to Lewis and then to Cape Wrath, and some
target fishing was unable to be carried out at the end of the survey due to bad weather. Staff therefore disembarked at Kyle at 0900 on 29 November and returned to Aberdeen by minibus.
During each survey period in each loch the tide gauge was deployed prior to the start of transecting and retrieved when work was finished in that loch, prior to moving to the next site. The light gauge recorded data throughout the cruise to determine ambient light levels and worked for more than half of the trip. 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 Duich five pelagic tows and six CTD deployments were carried out; in Loch Hourn six pelagic tows and four CTD deployments were carried out; in Loch Kishorn one pelagic tow and four CTD deployments were carried out; in Loch Nevis three pelagic tows and five CTD deployments were carried out. The time and position data for these tows and CTDs are in Tables 1 and 2 respectively.
Samples for the herring genetics component of the ROAME (in conjunction with the University of Hull) were taken in Lochs Duich and Nevis. Samples for the WESTHER project were taken in Loch Hourn.