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Metadata: 2017 Cornwall Inshore Fisheries and Conservation Authority (IFCA) Fal Oyster Survey
Abstract:
Cornwall Inshore Fisheries and Conservation Authority (IFCA) conduct annual dredge surveys within the Fal Oyster Fishery since taking over management of the fishery in 2014. The purpose of the survey was initially to assess the distribution and abundance of native oysters (Ostrea edulis) within the Fal Fishery management area in the River Fal, Cornwall. Since 2016 the survey has been developed to also assess queenies (queen scallop, Aequipecten opercularis; variegated scallop, Mimachlamys varia) distribution and abundance. Slipper limpets (Crepidula fornicata) were recorded at each site using a SACFOR style scheme. The aims of the survey were to investigate the relative abundance and distribution of native oysters (O. edulis) and scallops (queen scallop, A. opercularis; variegated scallop, M. varia) within the Fal Oyster Fishery. The distribution of substrate types across the fishery were also recorded at each site and species of bycatch were recorded across the survey area as a list of species present. In 2017, a total of 80 sites were completed and a total of 1481 oysters and 2952 scallops were recorded. The analysis was done by Geographic Areas; Harbour, Outer Harbour and River.
Data holder:
Cornwall Inshore Fisheries and Conservation Authority
Click on the red button for resource contact details:
- Click on the red button for resource contact details
Use constraints:
No restrictions to public access
| Other details | ||
| Internal code | Internally assigned metadata identifier | 2848 |
| 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. | 2017 Cornwall Inshore Fisheries and Conservation Authority (IFCA) Fal Oyster Survey |
| 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. | be5dbaeb413eeba2b430af81fdd84b70 |
| Resource Identifier | This is the code assigned by the data owner. | CIFCA_FAL_OYS_2017 |
| 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 | 2017-01-22 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2017-01-24 |
| Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | 250 |
| 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'. | asNeeded |
| Abstract | The abstract provides a clear and brief statement of the content of the resource. | Cornwall Inshore Fisheries and Conservation Authority (IFCA) conduct annual dredge surveys within the Fal Oyster Fishery since taking over management of the fishery in 2014. The purpose of the survey was initially to assess the distribution and abundance of native oysters (Ostrea edulis) within the Fal Fishery management area in the River Fal, Cornwall. Since 2016 the survey has been developed to also assess queenies (queen scallop, Aequipecten opercularis; variegated scallop, Mimachlamys varia) distribution and abundance. Slipper limpets (Crepidula fornicata) were recorded at each site using a SACFOR style scheme. The aims of the survey were to investigate the relative abundance and distribution of native oysters (O. edulis) and scallops (queen scallop, A. opercularis; variegated scallop, M. varia) within the Fal Oyster Fishery. The distribution of substrate types across the fishery were also recorded at each site and species of bycatch were recorded across the survey area as a list of species present. In 2017, a total of 80 sites were completed and a total of 1481 oysters and 2952 scallops were recorded. The analysis was done by Geographic Areas; Harbour, Outer Harbour and River. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | The positions of the survey sites were based on previous survey positions from surveys carried out by Cefas/ Cornwall Council prior to Cornwall IFCA taking over management of the fishery in 2014. The survey was carried out onboard research vessel Tiger Lily VI. The oyster dredge used was an Essex-style oyster dredge with a 72 cm blade, rigged with 34 mm diameter steel belly rings and a 45 mm (twin 3 mm nylon twine) mesh back. The dredge was deployed and recovered using the A frame on the stern of Tiger Lily VI. A target was created in Olex for each site position and a radius ring was added to ensure each tow was 50 m in length. A tow haul method was adopted, similar to that used by the oyster punts. This allowed the dredge tow to be of a known distance and to be easily and consistently replicated. At each survey site the survey vessel was anchored and 60 m of anchor line was let out. The dredge was shot by hand and the slave hauler winch was used to take up 50 m of marked anchor line, resulting in a 50 m dredge tow at a steady 0.5 to 1 knots. The towing warp was run via the A frame mounted hydraulic winch. The towing warp was marked off so that the length (m) of cable deployed at any time was known; this was generally fixed for an average depth and altered only if a depth change was sufficient to cause the dredge to fish too heavily or lightly. The dredge was recovered using the hydraulic winch and/ or A frame. Once recovered, the dredge contents were emptied on to the sorting table. If the dredge did not fish, due to being blinded or flipped over, or the sample appeared smaller than it should be for particular areas, the dredge haul was repeated. All positions were recorded using WGS84 projection and all times are recorded as Coordinated Universal Time (UTC). Each sample was photographed on the sorting table alongside a clapper board prior to sorting. Live native oysters and queen scallops were removed and set aside as the sample was sorted. All live oysters and queen scallops were counted and measured across the widest point, to the nearest mm using Vernier callipers. Slipper limpets were recorded on an abundance scale of 1-5. A list of bycatch species was made for the whole survey area. The bycatch recording in 2017 was a minor part of the oyster survey and the list of species recorded is shown in the report. Data was entered in situ into a recording sheet set up in Microsoft Excel. The size frequency distribution was graphed in Microsoft Excel and density maps were created in MapInfo Pro Advanced Version 17.0. Analysis was carried out comparing data from the geographic areas; outer harbour, harbour and river. For a full methodology please refer to the report. |
| Additional information | This describes relevant references to the data e.g. reports, articles, websites plus other useful information not captured elsewhere. | Jenkin, A., Trundle, C., Street, K. and Naylor, H. 2017. Fal Oyster Survey. Cornwall Inshore Fisheries and Conservation Authority (Cornwall IFCA), Hayle. |
| 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 | NDGO0005 | |
| Keyword title | data.gov.uk | |
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Species distribution |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Shellfish abundance and biomass in water bodies | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Bivalve molluscs | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 50.2482 |
| East | The eastern-most limit of the data resource in decimal degrees | -5.0063 |
| South | The southern-most limit of the data resource in decimal degrees | 50.1554 |
| West | The western-most limit of the data resource in decimal degrees | -5.0653 |
| Regional sea | Western Channel and Celtic Sea | |
| 29E4 | ||
| English Channel | ||
| VIIe | ||
| water column | ||
| 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 | Cornwall Inshore Fisheries and Conservation Authority | |
| Position name | Data Officer Cornwall IFCA Research Team | |
| enquiries@cornwall-ifca.gov.uk | ||
| Role | The distributor is the person or organisation that distributes the resource. | distributor |
| Organisation name | Cornwall Inshore Fisheries and Conservation Authority | |
| Individual name | Research Team Cornwall IFCA | |
| enquiries@cornwall-ifca.gov.uk | ||
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | Cornwall Inshore Fisheries and Conservation Authority | |
| Individual name | Research Team Cornwall IFCA | |
| enquiries@cornwall-ifca.gov.uk | ||
| 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 | Cornwall Inshore Fisheries and Conservation Authority | |
| Individual name | Research Team Cornwall IFCA | |
| enquiries@cornwall-ifca.gov.uk | ||
| 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 restrictions 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. | Data is freely available for research or commercial use providing that the originators are acknowledged in any publications produced and permission must be sought if the data will be reproduced in full or part or if used in any analyses. |
| 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. | 2019-04-09 |
| Harvest date | The date which this record has been (re)harvested from the provider. | 2026-04-12 |
| Metadata date | The date when the content of this metadata record was last updated. | 2021-11-24 |
| Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN Discovery metadata standard |
| Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | 2.3.8 |
| Metadata parent | 26dee2f510202899e51ae2e5c876a51c | |