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Metadata: 1002S-HERAS North sea herring acoustic survey- Scotia cruise 1002
Abstract:
Daily folders (20) of Simrad (.ek5 format) data. 20 Echoview format (EV) format analysis files. Excel biological data for 50 pelagic hauls. CTD data for 18 vertical dips. Temperature data from 45 minilogger profiles. 18 SVP profiles. Continual Thermosalinograph data. Continual AGDS data. Objectives To conduct an acoustic survey to estimate the abundance and distribution of herring in the north western North Sea and north of Scotland between 58-61•45’N and 4•W to 2•E, excluding Norwegian and Faroese waters. To Obtain echosounder trace identification using pelagic trawl. To obtain samples of herring for biological analysis, including age, length, weight, sex, maturity and ichthyophonus infection To obtain samples of herring for genetic analysis. To obtain photographic records for fish maturity analysis. To obtain hydrographic data for comparison with the horizontal and vertical distribution of herring. To obtain plankton samples for acoustic identification work.
Data holder:
Scottish Government (Marine Scotland)
Use constraints:
no limitations to public access
Other details | ||
Internal code | Internally assigned metadata identifier | 6218 |
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. | 1002S-HERAS North sea herring acoustic survey- Scotia cruise 1002 |
Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | herring, acoustic survey,north sea, Scotia |
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_1742 |
Resource Identifier | This is the code assigned by the data owner. | Marine_Scotland_FishDAC_1742 |
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 | 2002-06-27 |
End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2002-07-17 |
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 (.ek5 format) data. 20 Echoview format (EV) format analysis files. Excel biological data for 50 pelagic hauls. CTD data for 18 vertical dips. Temperature data from 45 minilogger profiles. 18 SVP profiles. Continual Thermosalinograph data. Continual AGDS data. Objectives To conduct an acoustic survey to estimate the abundance and distribution of herring in the north western North Sea and north of Scotland between 58-61•45’N and 4•W to 2•E, excluding Norwegian and Faroese waters. To Obtain echosounder trace identification using pelagic trawl. To obtain samples of herring for biological analysis, including age, length, weight, sex, maturity and ichthyophonus infection To obtain samples of herring for genetic analysis. To obtain photographic records for fish maturity analysis. To obtain hydrographic data for comparison with the horizontal and vertical distribution of herring. To obtain plankton samples for acoustic identification work. |
Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | Scotia sailed at 1300 on 27 June 2002 and made passage towards Sinclair Bay (Wick) which provided shelter from the strong northwesterly wind to attempt a calibration. However, the tide was too strong and a calibration was not attempted. Scotia started the survey at 0300 BST on 28 June and at 58o 10’N 3o 14’W and followed this latitude eastwards. East west transects were carried out at 15 n.mi spacing progressing northwards. After two transects were carried out Scotia broke off the survey at 2015 on 29 June and anchored in Scapa Flow to calibrate the acoustic instruments on all scientific sounders. At 0400 Scotia left Scapa Flow and commenced survey at 0600 BST at 58o 42’ N 2o 52’ W. The survey was carried out on east west transects on a 15n.mi. spacing progressing northwards between 2E, the Scottish mainland, and the Orkney and Shetland Islands from 0300 to 2300 BST. The cruise track is given in Figure 1. Additional short transects were added into the survey in areas of expected higher herring abundance to the east of Shetland. FRV Scotia ceased the survey at 2300BST at 60o 33’N 1o32’E) and docked in Lerwick at 0830 BST on 8 July for a mid cruise break. Scotia sailed again at 0800 BST on 9 July and recommenced the survey at 60o 40’N 0o 47’W at 1145 BST. FRV Scotia continued the survey north to 61o 40’N and then progressed southwards to the west of Shetland carrying out 7.5 n.mi spaced transects west of Shetland and finished the survey at 0600 BST on 15 July (60o 03’N 1o 10’W). FRV Scotia then proceeded to Sandwick Bay to carry out a second calibration of the acoustic instruments. FRV Scotia departed Sandwick Bay following successful calibration of acoustic instruments at 1400 GMT and sailed to Aberdeen and docked at 0630 BST on 17 July 2002. Main Activities Throughout the acoustic survey acoustic data was collected using a Simrad EK500 echosounder operating at 38, 120, 200 & 18kHz, with raw data collected using EchoView software. The data were scruitinised 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, 50 trawls were taken, of which 35 contained more than 100 herring. In addition to 18,442 length frequency data a total of 3290 herring were sampled for gonad, liver, and total weight, stomach fullness, sex, maturity, otolith and macroscopic evidence of ichthyophonus infection. Five samples of 200 fish were taken east of Shetland for HERGEN herring genetics project in addition to the routine biological samples fin clips were taken for genetic analysis. The thermosalinograph was run throughout the cruise, a total of 18 CTD stations were carried out, one per day at 2300 BST each night (Figure 2). A total of 45 mini-logger temperature profiles were collected by attaching the mini-logger to most trawl hauls to provide information on temperature profiles between CTD stations. Photographs of herring maturity stage were taken from fish at stages 2,3,4 and 8 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. The total mileage surveyed was approximately 2600 n.mi. (Figure. 1) with a total of 1016 acoustic log intervals recorded. Two successful calibrations were carried out, which gave consistent results with 1999 with a difference of less than 0.2 dB for the 38kHz system. Calibrations on 200 and 120 kHz were carried out and agreed to a slightly lower precision. Calibration of the 18kHz hydrographic sounder was performed with greater difficulty. Extensive continuous medium density concentrations of herring were found North of 58o 30’N to 59 o 00’N between 1 oW and 1 oE. High concentrations of herring were found east of Shetland on both sides and to the north of Poby Bank. Fishing was largely successful but marks were seen on the sounder but not caught on a few occasions. The trawl results were characterised by the very high proportion giving herring and the very low level of catch of all other species. A full stock estimate and survey report will be prepared shortly. Ichthyophonus infection within North Sea herring remains at a very low level, 5 in 3290 of the herring examined, which is similar to last year (6 of 4,531) |
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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45F0 | ||
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45F1 | ||
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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 | 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 | |
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. | 2016-05-05 |
Harvest date | The date which this record has been (re)harvested from the provider. | 2024-04-14 |
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 |