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Metadata: 1004S- HERAS North sea herring acoustic survey- Scotia cruise 1004
Abstract:
Daily folders (22) of Simrad format (.ek5) acoustic data. 22 Echoview format (EV) format analysis files. Excel biological data for 40 pelagic hauls. CTD data for 18 vertical dips. SVP data for 18 deployments. Data for 40 minilogger deployments. Continual Thermosalinograph data. 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 58°15-61.45'N and 4°W to 2°E, excluding Faroese waters. 2. To obtain echosounder trace identification using pelagic trawl. 3. To obtain samples of herring for biological analysis, including age, length, weight, sex, maturity and ichthyophonus infection. 4. To obtain photographic records for fish maturity analysis. 5. To obtain hydrographic data for comparison with the horizontal and vertical distribution of herring. 6. To obtain plankton samples for acoustic identification work. 7. To obtain plankton data using Utow. 8. To conduct SAT (Sea Acceptance Trial) on new EK60 echo sounder system.
Data holder:
Scottish Government (Marine Scotland)
Use constraints:
no limitations to public access
Other details | ||
Internal code | Internally assigned metadata identifier | 6236 |
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. | 1004S- HERAS North sea herring acoustic survey- Scotia cruise 1004 |
Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | North sea, herring, pelagic, acoustic survey, HERAS, Scotia, 1004S |
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_1753 |
Resource Identifier | This is the code assigned by the data owner. | Marine_Scotland_FishDAC_1753 |
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 | 2004-07-01 |
End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2004-07-22 |
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 (22) of Simrad format (.ek5) acoustic data. 22 Echoview format (EV) format analysis files. Excel biological data for 40 pelagic hauls. CTD data for 18 vertical dips. SVP data for 18 deployments. Data for 40 minilogger deployments. Continual Thermosalinograph data. 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 58°15-61.45'N and 4°W to 2°E, excluding Faroese waters. 2. To obtain echosounder trace identification using pelagic trawl. 3. To obtain samples of herring for biological analysis, including age, length, weight, sex, maturity and ichthyophonus infection. 4. To obtain photographic records for fish maturity analysis. 5. To obtain hydrographic data for comparison with the horizontal and vertical distribution of herring. 6. To obtain plankton samples for acoustic identification work. 7. To obtain plankton data using Utow. 8. To conduct SAT (Sea Acceptance Trial) on new EK60 echo sounder system. |
Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | Scotia sailed at 1000 BST on 1 July 2004 and made passage to the Buchan Deeps to test deployment of the fishing gear and then proceeded to Scapa Flow and anchored to calibrate the acoustic instruments on all scientific sounders. At 0730 BST Scotia left Scapa Flow and commenced survey at 0820 BST at 58°26’N 2°59’W. The survey was carried out on east/west transects on a 15 n.mi. spacing progressing northwards between 2E or the Norwegian line, the Scottish mainland, and the Orkney and Shetland Islands from 0300 to 2300 BST. Additional short transects were added into the survey in areas of expected higher herring abundance around Shetland. Scotia broke off the survey at 2300 BST on 9 July at 60°56’N 0°42’W and docked in Lerwick at 0800 BST on 12 July for a mid cruise break. Scotia sailed again at 0800 BST on 13 July and recommenced the survey at 60°56’N 0°42’W at 1345 BST. Scotia continued the survey north to 61°56’N and then progressed southwards to the west of Shetland carrying out 7.5 n.mi spaced transects to the north west of Shetland and 15 n.mi. transects west of Shetland south to Orkney. Scotia finished the survey at 0930 BST on 21 July (58°45’N 3°20’W). Scotia then proceeded to Scapa Flow to carry out a second calibration of the acoustic instruments. Scotia departed Scapa Flow following a successful calibration of acoustic instruments at 1730 BST and sailed to Aberdeen and docked at 0530 BST on 22 July 2004. Main Activities Throughout the acoustic survey acoustic data was collected using a Simrad EK500 echosounder operating at 38, 120, 200 and 18 kHz, with raw data collected using EchoView software. The total amount of date exceeded 90GigaBytes of raw data. The data were scrutinised in board and the allocation to species carried out within Echoview. Fishing with a PT160 midwater trawl was carried out on observed fish traces on an opportunistic basis. The locations of the trawl hauls are shown in Figure 1 and catch data summarised in Table 1. Forty pelagic trawl hauls were made of which, 38 contained more than 100 herring. In addition to 14,441 length frequency data a total of 3,881 herring were sampled for gonad, liver, and total weight, stomach fullness, sex, maturity, otolith and macroscopic evidence of ichthyophonus infection. The thermosalinograph was run throughout the cruise, a total of 18 CTD and SVP stations were carried out - one per day at 2300 BST each night (Fig. 1). A total of 40 mini-logger daily temperature profiles were collected by attaching the mini-logger to all of the trawl hauls to provide information on temperature profiles between CTD stations. Thirty-nine Methot net stations were carried out for plankton samples. Photographs of herring maturity stage were taken from fish at stages 1, 2, 3, 4, 5, 6 and 8 with intermediate stages also photographed from selected from hauls throughout the survey area. These will be combined with additional photographs to record the 8 stage maturity key used at the Marine Laboratory. Results All the survey objectives were met. The survey was completed successfully, with no time lost due to bad weather and only very minor limits to fishing due to netsonde cable failures. Fishing was particularly successful with no damage. The total mileage surveyed was approximately 2722 n.mi. (Fig. 1) with a total of 1,109 acoustic log intervals recorded. Two calibrations were carried out, which gave consistent results with a difference of less than 0.2 dB for the 38 kHz system. The second calibration was of a lower standard due to poorer weather conditions but was sufficiently accurate to establish that performance of the 38 kHz system had not changed. Continuous medium density concentrations of herring were found east of Poby Bank, and to the north of 61°20’N on the shelf. Medium density concentrations of herring were found near the shelf break west of Shetland and to the north west of Orkney between 3° and 4°W. Fishing was very successful - the trawl results being characterised by the very high proportions of herring in pelagic tows giving herring and the very low level of catch of all other species. The trawl results were particularly notable for the fact that almost all pelagic hauls caught full sample amounts of herring and no Norway pout; this has never occurred before. Ichthyophonus infection within North Sea herring remains at a very low level, 4 in 3,881 of the herring examined, which is similar to last year (6 of 3,296). A full stock estimate and survey report will be prepared shortly. |
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 | |
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 | 58 |
West | The western-most limit of the data resource in decimal degrees | -4 |
Regional sea | 45E6 | |
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45E9 | ||
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52E9 | ||
45F0 | ||
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52F0 | ||
45F1 | ||
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52F1 | ||
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 | University of St Andrews | |
Phone | +44 (0)1334 476161 | |
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. | 2016-05-09 |
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. | 2016-05-19 |
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 |