CE0713 Herring Biomass Assessment Survey

Published by: Marine Institute
Category: Environment
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This survey was conducted by the Marine Institute on board the R.V. Celtic Explorer in autumn 2007 to survey the abundance and distribution of herring In the southwest of Ireland and the Celtic Sea (ICES Divisions VIIaS, g and j). Here, herring are an important commercial species to the pelagic and polyvalent fleet. The stock is composed of both autumn and winter spawning components and the fishery targets pre-spawning and spawning aggregations. The autumn 2007 survey covered the area from Loop Head in ICES Division VIIb in Co. Clare and extended south along the western seaboard covering the main bays and inlets in Divisions VIIj and VIIg. The survey started in the north and worked in a southerly direction to facilitate temporal progression of spawning within stock components. Acoustic data were collected using the Simrad ER60 scientific echosounder. A single pelagic midwater trawl with the dimensions of 19m in length (LOA) and 6m at the wing ends and a fishing circle of 330 m was employed during the survey. All components of the catch from the trawl hauls were sorted and weighed; fish and other taxa were identified to species level. stations were carried out during the survey at predetermined locations along the track. Oceanographic (CTD) stations were carried out during the survey at predetermined locations along the track. Visual observations for marine mammals and seabirds were conducted during daylight hours. Survey into the abundance and distribution of herring in the southwest of Ireland and Celtic Sea.

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Theme Environment
Date released 2017-11-21
Date updated 2023-06-01
Dataset conforms to these standards See the referenced specification
Rights notes {"While every effort is made in preparing the dataset no responsibility is accepted by or on behalf of the Marine Institute for any errors, omissions or misleading information. The Marine Institute accepts no responsibility for loss or damage occasioned or claimed to have been occasioned, in part or in full, as a consequence of any person acting, or refraining from acting as a result of a matter contained in this datasets or as a consequence of using this dataset for any purpose whatsoever.","A Creative Commons (CC) license is one of several public copyright licenses that enable the free distribution of an otherwise copyrighted work. A CC license is used when an author wants to give people the right to share, use, and build upon a work that they have created. Under Creative Commons CC BY 4.0 the following is granted: Rights Share — copy and redistribute the material in any medium or format; Adapt — remix, transform, and build upon the material for any purpose, even commercially. The licensor cannot revoke these freedoms as long as you follow the license terms. Requirements Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.",CC%20BY%204.0}
Update frequency Other
Language English
Geographic coverage in GeoJSON format {"type":"Polygon","coordinates":[[[-10.979982499999991, 51.006949900000016],[-10.979982499999991, 53.270459], [-6.608085100000007, 53.270459], [-6.608085100000007, 51.006949900000016], [-10.979982499999991, 51.006949900000016]]]}
Spatial Reference Systems (SRS) WGS 84 (EPSG:3857)
Provenance information Data supplied by Marine Institute.
Period of time covered (begin) 2007-10-05
Period of time covered (end) 2007-10-25