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An array of 78 acoustic receivers was distributed among 47 rivers predominantly on the east and north coasts of Scotland. A further 8 receivers were moored on the north and east coasts near to shore. A total of 81 salmon captured in the Armadale coastal net fishery between 7 July and 25 August 2017 were tagged externally with small acoustic transmitters and released. Genetic samples were taken from each fish. Of the tagged fish, 44 (54%) were detected in rivers, one on the east coast (River Spey) and the others on the north coast (Rivers Naver, Borgie, Strathy, Halladale, Kinloch and Polla). The results are consistent with the main impact of the fishery being in the order of 100km, with occasional salmon captured from further away. Genetic analysis (in the absence of confirmation by tracking) would have suggested that the fishery was substantially more mixed stock with 30% of the catch being from the east coast and Hebrides. In fact, many of the fish assigned by genetics to east coast stocks appeared to return to north coast rivers. Possible explanations for this discrepancy are discussed. A range of patterns of movement of salmon among different rivers was observed. Tagged fish were detected near to shore on the north coast in the marine receiver array. Results of these 2017 experiments were compared with data collected in 2013 and 2014 using satellite tagging and associated genetics. In that case there was evidence of greater interception of east coast salmon at Armadale and good correspondence between predictions of home river from genetics and observations from satellite tagging, albeit based of a small sample size. Each salmon sampled in 2017 was assessed for presence of red vent syndrome (RVS) whereby the vent area of the fish was swollen and reddened. The incidence of RVS was 82%, higher than recorded previously. No difference could be detected in the subsequent survival of fish with and without RVS, but the power to detect any effect was very low because there were so few fish without the syndrome.
Scottish Government (Marine Scotland)
no limitations to public access
| Other details | ||
| Internal code | Internally assigned metadata identifier | 5962 |
| 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. | Application of acoustic tagging, satellite tracking and genetics to assess the mixed stock nature of coastal net fisheries |
| Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | Scottish Marine and Freshwater Science Vol 9 No 5 |
| 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_12094 |
| Resource Identifier | This is the code assigned by the data owner. | Marine_Scotland_FishDAC_12094 |
| 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 | 2017-07-07 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2017-08-25 |
| Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | 200.00 |
| 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. | An array of 78 acoustic receivers was distributed among 47 rivers predominantly on the east and north coasts of Scotland. A further 8 receivers were moored on the north and east coasts near to shore. A total of 81 salmon captured in the Armadale coastal net fishery between 7 July and 25 August 2017 were tagged externally with small acoustic transmitters and released. Genetic samples were taken from each fish. Of the tagged fish, 44 (54%) were detected in rivers, one on the east coast (River Spey) and the others on the north coast (Rivers Naver, Borgie, Strathy, Halladale, Kinloch and Polla). The results are consistent with the main impact of the fishery being in the order of 100km, with occasional salmon captured from further away. Genetic analysis (in the absence of confirmation by tracking) would have suggested that the fishery was substantially more mixed stock with 30% of the catch being from the east coast and Hebrides. In fact, many of the fish assigned by genetics to east coast stocks appeared to return to north coast rivers. Possible explanations for this discrepancy are discussed. A range of patterns of movement of salmon among different rivers was observed. Tagged fish were detected near to shore on the north coast in the marine receiver array. Results of these 2017 experiments were compared with data collected in 2013 and 2014 using satellite tagging and associated genetics. In that case there was evidence of greater interception of east coast salmon at Armadale and good correspondence between predictions of home river from genetics and observations from satellite tagging, albeit based of a small sample size. Each salmon sampled in 2017 was assessed for presence of red vent syndrome (RVS) whereby the vent area of the fish was swollen and reddened. The incidence of RVS was 82%, higher than recorded previously. No difference could be detected in the subsequent survival of fish with and without RVS, but the power to detect any effect was very low because there were so few fish without the syndrome. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | In total, 78 acoustic receivers were deployed in 47 rivers and eight marine deployments were positioned around the coastline. River receivers Pairs of receivers were deployed in lower reaches of each of the major east and north coast rivers. Single receivers were positioned in certain west coast rivers. Where possible, the lower receiver was positioned near the head of tide and the upper receiver was 1000-2000m further upstream. Locations were selected by local river managers to ensure safe access reasonable security from theft and vandalism and suitability for detecting salmon. Marine receivers In addition to the river array, eight VR2AR acoustic receivers with integrated acoustic releases (Vemco, Bedford, Nova Scotia, Canada) were deployed in release canisters at seven locations around the Scottish coastline (Fig. 1). Deployments on the east coast were 400-600m from shore. The deployment to the west of the netting location was a line of three receivers at 400m intervals from shore and termed the “northern array”. Each release canister comprised a stainless steel cylinder containing a length of rope (5 mm diameter, Dyneema) with three flotation buoys (275 mm diameter). The release canisters were anchored by two 50 kg ship links and held 2m off the sea bed by a mooring rope. Deployment off the sea bed resulted in the equipment being less sensitive to shifting due to surface wave action and also less susceptible to damage from passing boats. For retrieval of a moored receiver, a portable acoustic receiver with transponding hydrophone (VR100, Vemco, Bedford, Nova Scotia, Canada) was used to trigger the acoustic release, causing the rope encased in the release canister to uncoil and the canister to raise to the sea surface. The entire mooring could then be retrieved without leaving hardware on the sea be |
| 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 | Fisheries | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Commercial fish and shellfish populations are healthy | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 59.1534 |
| East | The eastern-most limit of the data resource in decimal degrees | -1.252441 |
| South | The southern-most limit of the data resource in decimal degrees | 54.55932 |
| West | The western-most limit of the data resource in decimal degrees | -6.987305 |
| 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 | Marine Scotland | |
| Phone | +44 (0)300 244 4000 | |
| Delivery point | 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 | Marine Scotland | |
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | Marine Scotland | |
| Resource locators | ||
| Locator URL | Web address (URL) that links to the resource | https://dx.doi.org/10.7489/12094-1 |
| Locator function | Code that describes the function of the resource. ISO function code chosen from ISO 19115-1 Codelist | DOI:https://dx.doi.org/10.7489/12094-1 |
| Dataset constraints | ||
| Limitations on public access | Any restrictions imposed on accessing the resource such as the need to agree to certain licence conditions. | Open Government License (http://www.nationalarchives.gov.uk/doc/open-government-licence/) |
| Access constraints (code) | ISO restriction code chosen from ISO 19115-1 Codelist | otherRestrictions |
| Use constraints (code) | ISO restriction name chosen from ISO 19115-1 Codelist | otherRestrictions |
| Use constraints | Any restriction on the use of the resource such as the need to agree to certain licence conditions. | no limitations to public access |
| 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. | 2018-05-10 |
| Metadata date | The date when the content of this metadata record was last updated. | 2018-05-11 |
| 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 |
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