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Metadata: 1106S HERAS North sea herring acoustic survey-Scotia cruise 1106S
Abstract:
Daily folders (20) of Simrad format (.raw) acoustic data. 20 daily folders of acoustic data (.ek5 format) from autonomous echo-sounder. Data from Holographic camera system held by AU.20 Echoview format (EV) format analysis files. Excel biological data for 40 pelagic hauls. CTD data for 48 oblique deployments. Excel data for 48 plankton dips. Continual AGDS data. Objectives 1. To conduct an acoustic survey to estimate the abundance and distribution of herring in the north western North Sea and north of Scotland between 58º15-61.45’N and 4ºW to 2ºE, excluding Faroese waters. 2. To obtain biological samples for echosounder trace identification using a pelagic trawl. 3. To obtain samples of herring for biological analysis, including age, length, weight, sex, maturity, ichthyophonus infection and fat content. 4. To obtain hydrographic data for comparison with the horizontal and vertical distribution of herring. 5. To obtain plankton samples map the distribution and abundance of zooplankton. 6. To test the multisampling pelagic cod-end. 7. To test FRS’ new Methot Isaacs Kidd nets. 8. To obtain holographic images of the low frequency scattering layer.
Data holder:
Scottish Government (Marine Scotland)
Use constraints:
no limitations to public access
Other details | ||
Internal code | Internally assigned metadata identifier | 6213 |
Title | The title is used to provide a brief and precise description of the dataset such as 'Date', 'Originating organisation/programme', 'Location' and 'Type of survey'. All acronyms and abbreviations should be reproduced in full. | 1106S HERAS North sea herring acoustic survey-Scotia cruise 1106S |
Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | HERAS, north sea, herring acoustic survey, 1106S |
File Identifier | The File Identifier is a code, preferably a GUID, that is globally unique and remains with the same metadata record even if the record is edited or transferred between portals or tools. | Marine_Scotland_FishDAC_1728 |
Resource Identifier | This is the code assigned by the data owner. | Marine_Scotland_FishDAC_1728 |
Resource type | The resource type will likely be a dataset but could also be a series (collection of datasets with a common specification) or a service. | dataset |
Start date | This describes the date the resource starts. This may only be the year if month and day are not known | 2006-07-01 |
End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2006-07-21 |
Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | 55000.00 |
Spatial resolution unit | This describes the unit of spatial resolution which for distance must be metres. | http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/uom/gmxUom.xml#m |
Frequency of updates | This describes the frequency with which the resource is modified or updated i.e. a monitoring programme that samples once per year has a frequency that is described as 'annually'. | Not Planned |
Abstract | The abstract provides a clear and brief statement of the content of the resource. | Daily folders (20) of Simrad format (.raw) acoustic data. 20 daily folders of acoustic data (.ek5 format) from autonomous echo-sounder. Data from Holographic camera system held by AU.20 Echoview format (EV) format analysis files. Excel biological data for 40 pelagic hauls. CTD data for 48 oblique deployments. Excel data for 48 plankton dips. Continual AGDS data. Objectives 1. To conduct an acoustic survey to estimate the abundance and distribution of herring in the north western North Sea and north of Scotland between 58º15-61.45’N and 4ºW to 2ºE, excluding Faroese waters. 2. To obtain biological samples for echosounder trace identification using a pelagic trawl. 3. To obtain samples of herring for biological analysis, including age, length, weight, sex, maturity, ichthyophonus infection and fat content. 4. To obtain hydrographic data for comparison with the horizontal and vertical distribution of herring. 5. To obtain plankton samples map the distribution and abundance of zooplankton. 6. To test the multisampling pelagic cod-end. 7. To test FRS’ new Methot Isaacs Kidd nets. 8. To obtain holographic images of the low frequency scattering layer. |
Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | All gear was loaded in Aberdeen on 28 June. Scientific staff joined the vessel at 08:00 UTC on 01 July and it departed at 09:30 on the same day. A small meeting was held with all scientists to explain the objectives of the survey and to describe general operating procedures. The survey commenced just outside Aberdeen at 10:00 on 01 July. Transects progressed northwards along lines of latitude, at spacings of 15 or 7.5 nautical miles (n.mi.). Transect spacing was based on the results of previous surveys and transects were placed relative to ICES rectangles. Transects extended as far east as 1° 45E, and as far as safely possible to the west on approaching the coast. Calibration of all four transducers took place in Scapa Flow in the early hours of the morning of Tuesday 4 July and the survey resumed afterwards at 09:35 of the same day. A half landing took place on 11 July in Lerwick in accordance with rest provision for the working time directive and for the exchange of personnel (Alex Brown and Palap Tiptus for Nick Burns and Hongyue Sun). The vessel resumed surveying at 11:00 on 12 July. West of the Shetland Isles, transects extended from the coast to the shelf edge or longitude 4° west. The survey was completed on 20 July at 12:45. All four transducers were calibrated successfully once again in Scapa Flow on 20 July. The vessel returned to Aberdeen on the morning of 21 July. 2.3 Survey design The survey track (Fig IID.1) was selected to cover the area with three levels of sampling intensity based on agreed boundaries to the east, west and south, and the limits of herring densities found in previous years to the north and Northwest. A transect spacing of 15 nautical miles was used in most parts of the area with the exception of areas to the east of Shetland where short additional transects were carried out at 7.5 n.mi. spacing and the area south of 58° 30’N where 30 nmi transect spacing was used. On the administrative boundaries of 2oE the ends of the tracks were positioned at twice the track spacing from the area boundary, giving equal track length in any rectangle within the area. The between track data was then included in the data analysis. Transects at shelf break were continued to the limits of the stock and the transect ends omitted from the analysis. Transects at the coast were continued as close inshore as practical, those on average less than half a transect spacing from the coast were excluded from the analysis, those at greater distance were included in the analysis. The origin of the survey grid was selected randomly within a 15 n.mi. interval the track was then laid out with systematic spacing from the random origin. Where the 7.5 and 30 n.mi. transect spacing was used the same random origin was used (as a proportion of the intertansect space). Finally, at the request of the Dutch, an additional two ICES rectangles were sampled (45F0 and 45F1): these were sampled using a zig-zag design to minimise the passage time back to the Scotia’s survey track (see Figure IID.1). 2.4 Calibration Two calibrations were carried out of the EK60 echosounder system used during the survey: one near the beginning of the survey on 4 July in Scapa Flow and one at the end of the survey on 20 July in Scapa Flow. Standard sphere calibrations were carried using 38.1mm diameter tungsten carbide sphere for 18, 38, 120 and 200 kHz. Agreement between the calibrations for 38 kHz was approximately 0.1dB. The calibration settings and results for 38kHz are given in Table IID.1. 2.5 Acoustic data collection The acoustic survey on FRV Scotia was carried out using a Simrad EK60 multifrequency echosounder with all four transducers (18, 38, 120 and 200 kHz) mounted on the drop keel. For most of the survey the keel was kept at 3m extension placing the transducer at 8.5m depth. Data was archived for further data analysis which was carried out using Sonardata Echoview software and Marine Lab Analysis systems. Data were collected from 0200 to 2200 GMT. A total of 2255 n.mi. were surveyed and included in the analysis. 2.6 Biological data - fishing trawls A total of 40 trawl hauls (positions shown in Fig IID.1) were carried out during the survey on the denser echo traces. The fishing gear used throughout the survey was the PT160 pelagic trawl; in the latter half of the survey this was augmented by the addition of a three cod-end multisampling trawl. Each haul was monitored using a Simrad FS903 scanning netsonde. The catch from each haul was sampled for length, age, maturity and weight of individual herring. In addition weights of gonads and livers were also collected. Between 250 and 500 fish were measured at 0.5 cm intervals from each haul. Otoliths were collected with one per 0.5 cm class below 20.5 cm, three per 0.5cm class from 21-25.5cm and ten per 0.5 cm class for 26.0 cm and above. The same fish were sampled for whole weight, gonad weight, liver weight, sex, maturity, stomach contents and macrosco |
Related keywords | ||
Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Marine Environmental Data and Information Network |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Acoustics | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Biota composition | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Fish | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Water column temperature and salinity | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Zooplankton | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Acoustic backscatter in the water column | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Fish abundance in water bodies | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Fish biomass in water bodies | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Fish morphology, age and physiology | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Water column photography | |
Geographical coverage | ||
North | The northern-most limit of the data resource in decimal degrees | 62 |
East | The eastern-most limit of the data resource in decimal degrees | 2 |
South | The southern-most limit of the data resource in decimal degrees | 57 |
West | The western-most limit of the data resource in decimal degrees | -4 |
Regional sea | 46E6 | |
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Responsible organisations | ||
Role | The point of contact is person or organisation with responsibility for the creation and maintenance of the metadata for the resource. | pointOfContact |
Organisation name | Scottish Government (Marine Scotland) | |
Phone | +44 (0)300 244 4000 | |
Role | The point of contact is person or organisation with responsibility for the creation and maintenance of the metadata for the resource. | pointOfContact |
Organisation name | Scottish Government (Marine Scotland) | |
Phone | +44 (0)300 244 4000 | |
Delivery point | Mailpoint 11, Area 1B South, Victoria Quay | |
Postal code | EH6 6QQ | |
City | Edinburgh | |
Country | United Kingdom | |
Role | The custodian is the person or organisation that accepts responsibility for the resource and ensures appropriate care and maintenance. If a dataset has been lodged with a Data Archive Centre for maintenance then this organisation is be entered here. | custodian |
Organisation name | Scottish Government (Marine Scotland) | |
Phone | +44 (0)300 244 4000 | |
Delivery point | Mailpoint 11, Area 1B South, Victoria Quay | |
Postal code | EH6 6QQ | |
City | Edinburgh | |
Country | United Kingdom | |
Role | The distributor is the person or organisation that distributes the resource. | distributor |
Organisation name | Scottish Government (Marine Scotland) | |
Phone | +44 (0)300 244 4000 | |
Delivery point | Mailpoint 11, Area 1B South, Victoria Quay | |
Postal code | EH6 6QQ | |
City | Edinburgh | |
Country | United Kingdom | |
Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
Organisation name | Aberdeen University | |
Phone | +44 1224 272 000 | |
Delivery point | King's College | |
Postal code | AB24 3FX | |
City | Aberdeen | |
Country | United Kingdom | |
Resource locators | ||
Locator URL | Web address (URL) that links to the resource | https://www.bodc.ac.uk/data/information_and_inventories/cruise_inventory/search/ |
Locator function | Code that describes the function of the resource. ISO function code chosen from ISO 19115-1 Codelist | Reference info #0 |
Dataset constraints | ||
20 Limitations on Public Access - Access constraints | otherRestrictions | |
20 Limitations on Public Access - Other constraints | This states any limitations on access to the data and uses free text. | no limitations to public access |
21 Conditions for Access and Use - Use limitation | This states any constraints on use of the data. Multiple conditions can be recorded for different parts of the data resource. If no conditions apply, then `No condtions apply` is recorded. This uses free text. | Open Government License (http://www.nationalarchives.gov.uk/doc/open-government-licence/) |
Version info | ||
Date of publication | The publication date of the resource or if previously unpublished the date that the resource was made publicly available via the MEDIN network. | 2016-04-07 |
Harvest date | The date which this record has been (re)harvested from the provider. | 2024-04-21 |
Metadata date | The date when the content of this metadata record was last updated. | 2016-05-03 |
Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN Discovery Metadata |
Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | Version 2.3.7 |