SAC Monitoring: Afon Tywi Shad Egg Survey (2012)

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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.

Identification

Dynodydd
Identifier
NRW_DS115312
Teitl Amgen
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)
Laith Metadata
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.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2013-05-31
Perchennog
Owner
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Countryside Council for Wales (CCW)
Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW
http://naturalresourceswales.gov.uk/splash?orig=/
Cychwynnwr
Originator
  Environment Agency Wales (EA Wales)
Cambria House, 29 Newport Road, Cardiff, CF24 0TP, Wales
www.environment-agency.gov.uk
Cychwynnwr
Originator
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 

Extent

Extent

Hyd
Geographic Extent
SIR GAERFYRDDIN - CARMARTHENSHIRE
N
W
E
S
Map representing the geographic extent of the dataset


 
 

Distribution

Fformat - Math a Disgrifiad
Format Type and Description
  • 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.

 

Quality

Ansawdd Data
Data quality

Cwmpas Ansawdd
Quality Scope
Dataset
Dataset
Cydymffurfiad
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

Allweddair
Keywords

GEMET - INSPIRE themes, version 1.0
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2008-06-01
Code
geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Allweddair
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
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2023-12-31
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords
 

Spatial Reference System

Code
British National Grid (EPSG::27700)
 

Content

Gwybodaeth Cynnwys
Content Information

Proffil CNC
NRW Profile

Elfennau CNC
Custom Elements

NRW Related Title

Afon Tywi SAC shad egg survey 2012
 

Constraints

Constraints

Limitations on Public Access and Use

Math o Gyfyngiad
Restriction type
Other restrictions
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

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
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

Metadata

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313135333132 XML
Laith Metadata
Metadata Language
English
Parent Identifier
Freshwater Shad Monitoring Data

NRW_DS116346
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2024-05-31T09:42:49.854Z
Enw Safonol Metadata
Metadata Standard Name
NRW
Fersiwn Metadata
Metadata Standard Version

1.0

Pwynt Cyswllt
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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