SAC Monitoring: Afon Tywi Shad Egg Survey (2012)

The Afon Tywi is designated as a Special Area of Conservation (SAC) under the EC 92/43/EEC Habitats Directive for several features including twaite shad (Alosa fallax) and allis shad (Alosa alosa). Shads are migratory members of the Clupeidae (herring family) that ascend rivers to spawn in late spring. The populations of both species are threatened in Europe mainly due to obstructions to migration and issues surrounding water quality. In the UK, significant populations of shad spawn in the Rivers Severn, Usk, Wye and Tywi. Former Countryside Council for Wales (CCW), Environment Agency Wales (EAW) and now Natural Resources Wales (NRW) is responsible for monitoring the condition of shad populations within SACs and to ensure the maintenance of favourable conservation status within these designated sites. The Joint Nature Conservation Committee (JNCC) published generic guidance on 'Common Standards Monitoring Guidance for Freshwater Fauna' (JNCC, 2005) outlining the attributes (mandatory and discretionary) and targets for monitoring freshwater fish. These include targets for shad population, river flow, water quality and river morphology. The purpose of this data collection was to facilitate the determination of Favourable Conservation status of Shad in the Afon Tywi. Confidence in this dataset is high, as survey were undertaken by experienced staff members.

Identifier: NRW_DS115312

Alternative Title

Shad egg Survey Afon Tywi 2012 - CCW - Report No. 12/8/4 CCW000800000000P
Monitro ACA: Arolygu Wyau Gwangod (Alosa fallax) a Herlynod (Alosa alosa) yn Afon Tywi (2012)

Metadata Language: English

Lineage: Countryside Council for Wales' (CCW) and Environment Agency Wales (EAW) staff monitored the spawning distribution of shads at 13 sample sites within 60 km of the main river corridor during the spawning season of 2012. The standard methodology was amended to reduce the sampling required at sites where shad eggs were present. This enabled the CSM target to be assessed and many more sites to be surveyed within the available time. The Hillman et al (2003) methodology was modified to a minimum of 10 kick samples were undertaken at each site with the number of eggs found in each kick recorded. If 10 or more shad eggs were recorded after 10 kicks the survey was terminated. However, if fewer than 10 shad eggs were recorded, kick sampling continued either until 10 eggs were found or 25 kick samples had been completed.

Additional Information: Freshwater Monitoring Co-ordinator, NRW. Ffynnon Reference NRW-13-019708 Garrett, H.M., Thomas, Rh. & Hatton-Ellis, T.W. (2012). Afon Tywi SAC shad egg survey 2012. CCW Staff Science Report No. 12/8/4. 37pp, CCW. Bangor.

Dataset Reference Date (Publication): 2013-05-31

Temporal Extent

Begin date: 2012-05-22

End date: 2012-05-29

Topic category

Biota

Owner

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

Originator

Countryside Council for Wales (CCW)

Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW

http://naturalresourceswales.gov.uk/splash?orig=/

Originator

Environment Agency Wales (EA Wales)

Cambria House, 29 Newport Road, Cardiff, CF24 0TP, Wales

www.environment-agency.gov.uk

Originator

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

Extent

Geographic Extent: SIR GAERFYRDDIN - CARMARTHENSHIRE

Format Type and Description

Database Database ()

Specification

[A] Report in word and pdf format in Ffynnon (NRW-13-014651 / NRW-13-019708) [B] A set of survey site Photos in jpeg format (collated in Document DCT-12-229420) [C] A series of GIS layers in MapInfo .Tab format on which the maps are based [D] A set of spreadsheets for the raw data and worked up data in xls format (DCT-12-168511, DCT-12-181270, DCT-12-233511) [E] Field notes in paper format (held in in Llandeilo office. Copies held in MFEG, Maes y Ffynnon, Bangor) [F] Species data is held within Recorder as Shad egg Survey Afon Tywi 2012 - CCW - Report No. 12/8/4 CCW000800000000P.

Data quality

Quality Scope: Dataset

Conformity: Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
Explanation
Degree: false

Lineage: Countryside Council for Wales' (CCW) and Environment Agency Wales (EAW) staff monitored the spawning distribution of shads at 13 sample sites within 60 km of the main river corridor during the spawning season of 2012. The standard methodology was amended to reduce the sampling required at sites where shad eggs were present. This enabled the CSM target to be assessed and many more sites to be surveyed within the available time. The Hillman et al (2003) methodology was modified to a minimum of 10 kick samples were undertaken at each site with the number of eggs found in each kick recorded. If 10 or more shad eggs were recorded after 10 kicks the survey was terminated. However, if fewer than 10 shad eggs were recorded, kick sampling continued either until 10 eggs were found or 25 kick samples had been completed.

Keywords

GEMET - INSPIRE themes, version 1.0

Species distribution

Type: Theme

Citation

Date (Publication): 2008-06-01

Code: geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Keywords

NRW Thesaurus

allis shad
alosa alosa
Shad
twaite shad
alosa fallax
river Tywi (afon Tywi)
Special Area of Conservation Monitoring
Special Areas of Conservation (SAC) - SAC monitoring

Type: Theme

Citation

Date (Publication): 2023-12-31

Code: geonetwork.thesaurus.local.theme.converted_nrw-keywords

Code: British National Grid (EPSG::27700)

Content Information

NRW Profile

Custom Elements

NRW Related Title: Afon Tywi SAC shad egg survey 2012

Constraints

Limitations on Public Access and Use

Restriction type: Other restrictions

Access Constraints Directive

Limitations: no limitations

Access Constraints Text

Other constraints: There are no access restrictions to this data. NRW may release, publish or disseminate it freely.

Use Constraints

Use constraints type: Other restrictions

Other constraints: © CNC/NRW 2013 There are no use restrictions on this data. Recipients may re-use, reproduce, disseminate this data free of charge in any format or medium, provided they do so accurately, acknowledging both the source and NRW's copyright, and do not use it in a misleading context. It is the recipient's responsibility to ensure the data is fit for the intended purpose, that dissemination or publishing does not result in duplication, and that it is fairly interpreted. Advice on interpretation should be sought where required. To avoid re-using old data, users should periodically obtain the latest version from the original source.

Metadata

File Identifier: 4f4c4942-4343-5764-6473-313135333132 XML

Metadata Language: English

Parent Identifier: Freshwater Shad Monitoring Data
NRW_DS116346

Resource type: Dataset

Metadata Date: 2024-05-31T09:42:49.854Z

Metadata Standard Name: NRW

Metadata Standard Version: 1.0

pointOfContact

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

Publishing Body

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SAC Monitoring: Afon Tywi Shad Egg Survey (2012)

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Extent

Distribution

Quality

Data quality

Keywords

Keywords

Citation

Keywords

Citation

Spatial Reference System

Content

Content Information

NRW Profile

Custom Elements

Constraints

Constraints

Limitations on Public Access and Use

Access Constraints Directive

Access Constraints Text

Use Constraints

Metadata

Metadata

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