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Metadata: By-catch from AFBI Irish Sea Nephrops Trawl Research Surveys 1994 - 2018
Abstract:
This dataset contains information on bycatch of non-target species from the AFBI Nephrops Trawl Research Survey series between 1994 â?? present from surveys carried out in the Irish Sea. The primary objectives of this research surveys series are: â?¢ To study spatial variability in population structure and abundance of Nephrops and by-catch species. â?¢ To obtain information on temporal trends of population structure of Nephrops. â?¢ To study female maturity in Nephrops. Between 1994 â?? 2010 the Research Survey was carried out on a bi-annual basis in the spring and autumn of each year. During each of these research surveys between 18 - 32 stations were primarily sampled using a nephrops otter trawl net; similar to that used in the commercial fishery. In addition, at select number of stations, various net types were used to sample for a comparison between nets. Each sampled station comprises a 3-mile trawling lane. Towing speed across the ground varies with tide and weather a target speed of 3 knots is aimed where possible. From 2010 â?? present, the research survey was carried out on an annual basis in summer of each year (July/August) whereby sampling occurred at c. 24 fixed stations.
Data holder:
Agri-Food and Biosciences Institute
Click on the red button for resource contact details:
- Click on the red button for resource contact details
Use constraints:
no restrictions
| Other details | ||
| Internal code | Internally assigned metadata identifier | 2602 |
| 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. | By-catch from AFBI Irish Sea Nephrops Trawl Research Surveys 1994 - 2018 |
| 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. | ae63c009044bf2f46c742920d1a6bbc3 |
| Resource Identifier | This is the code assigned by the data owner. | afbiUWTVNephrops |
| 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 | 1994-04-18 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2018-08-23 |
| Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | 50 |
| 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'. | annually |
| Abstract | The abstract provides a clear and brief statement of the content of the resource. | This dataset contains information on bycatch of non-target species from the AFBI Nephrops Trawl Research Survey series between 1994 â?? present from surveys carried out in the Irish Sea. The primary objectives of this research surveys series are: â?¢ To study spatial variability in population structure and abundance of Nephrops and by-catch species. â?¢ To obtain information on temporal trends of population structure of Nephrops. â?¢ To study female maturity in Nephrops. Between 1994 â?? 2010 the Research Survey was carried out on a bi-annual basis in the spring and autumn of each year. During each of these research surveys between 18 - 32 stations were primarily sampled using a nephrops otter trawl net; similar to that used in the commercial fishery. In addition, at select number of stations, various net types were used to sample for a comparison between nets. Each sampled station comprises a 3-mile trawling lane. Towing speed across the ground varies with tide and weather a target speed of 3 knots is aimed where possible. From 2010 â?? present, the research survey was carried out on an annual basis in summer of each year (July/August) whereby sampling occurred at c. 24 fixed stations. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | This dataset contains a long-term time series (1994 â?? 2018) of bycatch data from the AFBI Nephrops Trawl research survey series carried out in the Irish Sea. It should be noted that the species of primary concern of this research survey was the Dublin Bay prawn (Nephrops norvegicus); and as such the survey design, sampling protocol and technical equipment were designed to maximise the recording of the target species. Over the course of the time series there has been adjustments to survey design, sampling protocol, survey staff and technical equipment in response to changing requirements and latest novel developments in survey equipment. Most notably was the change in Research Vessel from the R.V. Lough Foyle to the R.V. Corystes in 2005. At the end of each research survey individual cruise reports are composed by the Scientist in Charge of (S.I.C.) that provide a summary of the individual survey design, sampling protocol, survey staff and technical equipment and are available on request. The below protocol outlines a general overview of the sampling protocol of the research survey. A bespoke survey report outlined the specification. From each towed station the total catch from the net is emptied into a 1 tonne fish hopper. If the catch is 100 kg or less the entire catch is sorted to species, for larger catches a stratified sampling scheme is applied whereby sampling effort is targeted to species of commercial interest. Dependent on the size of the catch, the catch is sorted into species and size categories at the hopper or for larger catches, unsorted baskets are sampled. The weights in each category of each species are recorded, as well as the weight of any unsorted catch. Greatest accuracy is required for commercial whitefish species for which indices of abundance of different age-classes are required for scientific stock assessments (cod, whiting, haddock and herring). For those species, take a sufficient number of fish at random from each category such that there are approximately 50 fish in the modal length class of the measured fish. Where there are several modes in the length frequency it may only be feasible to measure to about 30 in a mode. If there are several baskets of fish, take a sub-sample from each basket. Sample-sizes for non-commercial species such as poor cod and sprat may be smaller, e.g. a total of 50-100 fish depending on the spread of length classes. Record the weight of fish in the length frequency and enter it onto the length-frequency form together with all other relevant details, particularly the category number. All fish are measured to the nearest cm below (pelagic fish, such as herring, sprat, mackerel, are measured to the 0.5 cm below), and are measured from the tip of the nose to the tip of the tail (total length). |
| 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 | Species distribution | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Fishing by-catch | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 54.8612 |
| East | The eastern-most limit of the data resource in decimal degrees | -2.7361 |
| South | The southern-most limit of the data resource in decimal degrees | 53.3839 |
| West | The western-most limit of the data resource in decimal degrees | -6.1592 |
| Regional sea | Irish Sea | |
| Inner Seas off the West Coast of Scotland | ||
| Irish Sea and St. George's Channel | ||
| VIIa | ||
| 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 | Agri-Food and Biosciences Institute | |
| Position name | Project manager | |
| dassh.enquiries@mba.ac.uk | ||
| Role | The distributor is the person or organisation that distributes the resource. | distributor |
| Organisation name | Agri-Food and Biosciences Institute | |
| Position name | Project manager | |
| dassh.enquiries@mba.ac.uk | ||
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | Agri-Food and Biosciences Institute | |
| Position name | Project manager | |
| dassh.enquiries@mba.ac.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 | Agri-Food and Biosciences Institute | |
| Position name | Project manager | |
| dassh.enquiries@mba.ac.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 |
| 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. | no conditions |
| 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. | 2019-01-10 |
| Harvest date | The date which this record has been (re)harvested from the provider. | 2026-04-19 |
| Metadata date | The date when the content of this metadata record was last updated. | 2019-01-10 |
| 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 |