KiEco: Freshwater Fish - Geospatial
Freshwater fish are used as an indicator of stock status, water and habitat quality, artificial obstacles to migration and river flow requirements due to specific life-cycle requirements. This dataset is made up of the species count and length values from the freshwater river fish surveys conducted across Wales by Natural Resources Wales and former Environment Agency Wales. These surveys are conducted as part of on-going monitoring of fish in their natural environment for legislative requirements and to meet business drivers.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS125743
- Alternative Title
-
- NRW Freshwater Fish Surveys
- Metadata Language
- English
- Lineage
-
A strict methodology is applied when sampling for freshwater river fish. There is a core network of sites which are monitored on an annual basis, and also catchment-wide surveys on a six-year rolling programme. These sites are located in habitat types suitable for the respective fish species. In addition, sites may be sampled for investigative work, or on an ad hoc basis. Sampling areas are commonly 50 metres long and the full width of the river and may embrace different flow types and substrate. For Catch Per Unit Effort (CPUE) survey strategy the effort is based on a time measurement. Electric fishing is the most commonly used sampling method, although alternative methods are available for different strategies, such as netting and trapping. Once a sample of fish is collected, they are immediately identified in the field, measured and counted and then released alive into the same section of river from where they were captured.
For many of our surveys we record an NGR at the site because this acts as a central/representative location around which we collect lots of samples. An NGR is then also recorded against each of the samples to give a more accurate sampling location.
Redactions
Some information has be redacted to make the data openly available. This includes:
Third party data
Data collected for ongoing investigations
Cancelled or incomplete surveys
Update Frequency
This data is continually update with the most surveys undertaken in the summer. Data from survey seasons is often not enter at the time of capture and can be several months before its is entered into the system. The external dataset is updated monthly to include new data, and may also contain corrections to previously published data due to quality assurance work.
Information Warnings
Freshwater fish survey data is available from 1974 to present. A caveat being that historical data are sporadic until 2001. This is because fish survey data collected before 2001 were often saved in local databases and not the national ones (KiEco and formerly NFPD).
Fish surveys are carried out by a range of survey methods, the data from one survey is not necessarily directly comparable to another. For example, the total fish count may be based on multiple or single run surveys or Catch Per Unit Effort (CPUE) surveys. The user is recommended to check the survey method used in the data provided.
We do our best to avoid data quality problems, but as these datasets reflect the data we hold, they may contain errors.
- Dataset Reference Date (Publication)
- 2024-12-31
Temporal Extent
- Begin date
- 1974-01-01
- Topic category
-
- Biota
Extent
Extent
- Geographic Extent
- Wales (WLS)
))
Distribution
Distribution
- Format Type and Description
-
-
Geographic Information System
(
1
)
-
Geographic Information System
(
1
)
- Resource Locator
- View and Download Data ( WWW:LINK-1.0-http--link )
- Resource Locator
- Web Mapping Service ( OGC:WMS )
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
-
A strict methodology is applied when sampling for freshwater river fish. There is a core network of sites which are monitored on an annual basis, and also catchment-wide surveys on a six-year rolling programme. These sites are located in habitat types suitable for the respective fish species. In addition, sites may be sampled for investigative work, or on an ad hoc basis. Sampling areas are commonly 50 metres long and the full width of the river and may embrace different flow types and substrate. For Catch Per Unit Effort (CPUE) survey strategy the effort is based on a time measurement. Electric fishing is the most commonly used sampling method, although alternative methods are available for different strategies, such as netting and trapping. Once a sample of fish is collected, they are immediately identified in the field, measured and counted and then released alive into the same section of river from where they were captured.
For many of our surveys we record an NGR at the site because this acts as a central/representative location around which we collect lots of samples. An NGR is then also recorded against each of the samples to give a more accurate sampling location.
Redactions
Some information has be redacted to make the data openly available. This includes:
Third party data
Data collected for ongoing investigations
Cancelled or incomplete surveys
Update Frequency
This data is continually update with the most surveys undertaken in the summer. Data from survey seasons is often not enter at the time of capture and can be several months before its is entered into the system. The external dataset is updated monthly to include new data, and may also contain corrections to previously published data due to quality assurance work.
Information Warnings
Freshwater fish survey data is available from 1974 to present. A caveat being that historical data are sporadic until 2001. This is because fish survey data collected before 2001 were often saved in local databases and not the national ones (KiEco and formerly NFPD).
Fish surveys are carried out by a range of survey methods, the data from one survey is not necessarily directly comparable to another. For example, the total fish count may be based on multiple or single run surveys or Catch Per Unit Effort (CPUE) surveys. The user is recommended to check the survey method used in the data provided.
We do our best to avoid data quality problems, but as these datasets reflect the data we hold, they may contain errors.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
-
NRW Thesaurus
-
- catchment survey
- fish (fishes) (see also specific species)
- monitoring (see specific types of monitoring eg. woodland monitoring)
- electric fishing
- Type
- Theme
Citation
- Date (Publication)
- 2024-06-19
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
Constraints
Constraints
Limitations on Public Access and Use
- Restriction type
- Other restrictions
Access Constraints Directive
- Limitations
- noLimitations
Access Constraints Text
- Other constraints
-
There are no access restrictions on this data. NRW may release, publish or disseminate it freely.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
-
© CNC/NRW Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose.
Attribution Statement
- Other constraints
-
Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.
Licence
- Other constraints
- Open Government Licence
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313235373433 XML
- Metadata Language
- English
- Resource type
- Dataset
- Metadata Date
- 2025-01-02T09:54:14.051Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
-
1.0