European Ocean Biodiversity Information System

[ report an error in this record ] Print this page

Benthic bycatch from dredge surveys for seed mussel (Mytilus edilus) stock assessment, Outer Ards, Northern Ireland
Citation
Agri-Food and Biosciences Institute (AFBI) (2019): Benthic bycatch from dredge surveys for seed mussel (Mytilus edilus) stock assessment, Outer Ards, Northern Ireland. v3.6. Marine Biological Association. Dataset/Samplingevent https://doi.org/10.17031/2z09sx
Contact:

Access data
Archived data
Availability: Creative Commons License This dataset is licensed under a Creative Commons Attribution 4.0 International License.

Description
This dataset contains presence/absence information of infaunal bycatch from seed mussel stock (Mytilus edulis) assessment surveys off the Outer Ards Peninsula in Northern Ireland. The seed mussel survey is carried out each year and this particular dataset contains the bycatch information from initial ground truthing (dredge) on these surveys from 2017-02 to 2018- 07. more

The dredge samples are taken from the DAERA Fisheries Protection Vessel Queen of Ulster (formally Banríon Uladh). The main aim of the seed mussel survey is to carry out a stock assessment of seed mussel in areas that are fished for these mussels. The stock assessment surveys use acoustic ground discrimination system (AGDS), dredge surveys (ground truthing) and then in areas where there appears to be high levels of seed mussel an underwater video camera sledge is towed from the RV Corystes for more ground truthing. In total there were 42 dredge tows carried out that contained bycatch in this dataset. It is important to note that the information in this dataset was not the key focus of these surveys. The most common species found were Laminaria species.

"This dataset contains information on the presence and absence of bycaught infauna species during the stock assessment surveys of seed mussel (Mytilus edulis) in the Outer Ards Peninsula in Northern Ireland in 2017 and 2018. As this dataset contains bycatch data it is important to note that the infauna were not the key aim of the survey. The seed mussel stock assessment is carried out with the aim of providing a comprehensive assessment of the state of the seed mussel beds which are commercially fished. Initially a RoxAnn acoustic ground discrimination system (AGDS) using a 200kHz transducer collected data on the roughness & hardness of the substrate at a save rate of 1s. This acoustic device was deployed off the Fisheries Protection Vessel Queen of Ulster (formally Banríon Uladh). A dredge survey was then carried out from the Queen of Ulster using a custom oyster dredge (1.5m x 0.5m) following the AFBI Standard Operating Procedure (SOP) “Collection & recording of benthic dredge samples”. In total there were 42 dredge tows carried out that contained bycatch in this dataset.The bycaught species were identified as accurately as possible and recorded (presence/ absence). A towed epibenthic video sledge was used from the RV Corystes to provide further ground truthing information for the stock assessment (this information is not present in this dataset). A Konsberg video camera, halogen lights and point lasers (for scaling) were all attached to the camera sledge and towed at an estimated speed of 0.5-0.8 knots. The footage was reviewed by experienced marine biologists.

Scope
Themes:
Biology > Benthos, Biology > Fish, Biology > Macroalgae, Biology > Plankton > Zooplankton
Keywords:
Marine, ANE, Irish Sea, ANE, St. Georges Channel, Actinopterygii, Asteroidea, Bivalvia, Malacostraca, Phaeophyceae

Geographical coverage
ANE, Irish Sea [Marine Regions]
ANE, St. Georges Channel [Marine Regions]

Temporal coverage
21 February 2017 - 25 July 2018

Taxonomic coverage
Actinopterygii [WoRMS]
Asteroidea [WoRMS]
Bivalvia [WoRMS]
Malacostraca [WoRMS]
Phaeophyceae [WoRMS]

Parameter
Occurrence of biota

Contributors
Agri-Food and Biosciences Institute (AFBI), moredata creator
Marine Biological Association of the UK (MBA), moredata provider

Related datasets
Published in:
EurOBIS: European Ocean Biodiversity Information System, more

Dataset status: Completed
Data type: Data
Data origin: Research: field survey
Metadatarecord created: 2019-01-10
Information last updated: 2020-07-28
All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy