{"id":2079,"date":"2014-07-16T11:39:58","date_gmt":"2014-07-16T11:39:58","guid":{"rendered":"http:\/\/blogs.scotland.gov.uk\/coastal-monitoring\/?p=2079"},"modified":"2018-12-04T14:26:56","modified_gmt":"2018-12-04T14:26:56","slug":"mrv-scotia-survey-0814s-herring-acoustic-survey","status":"publish","type":"post","link":"https:\/\/blogs.gov.scot\/marine-scotland\/2014\/07\/16\/mrv-scotia-survey-0814s-herring-acoustic-survey\/","title":{"rendered":"MRV Scotia; Survey 0814S – Herring Acoustic Survey"},"content":{"rendered":"
\"Proposed<\/a>

Proposed Survey Track Scotia 0814S<\/p><\/div>\n

Overview of survey:<\/strong>
\n<\/strong>The MRV Scotia<\/em> and a chartered pelagic vessel will conduct the Herring Acoustic Survey covering the area\u00a0shown below. The pelagic vessel will identify fish shoals using the echosounder and fishing operations will be carried out using the multisampler cod end unless large aggregations are seen in the area. Samples of all species caught will be measured for length and weighed to establish a length-weight relationship.<\/p>\n

Otoliths will be collected from a sub-sample of the herring to determine age. For each herring in the sub-sample the state of maturity, gonad weight, liver weight, whole and gutted weight, presence of food in the stomach as well as any presence of infection. In addition, random sampling of fish above 24 cm length will be carried out and photographs taken for identification analysis. Otoliths from these fish will, subsequent to ageing, will be made available for analysis.<\/p>\n

The ships thermosalinograph will be run continuously to obtain sea surface temperature and salinity throughout the survey area.<\/p>\n

Duration:<\/strong> 28 June \u2013 17 July 2014
\nPersonnel:<\/strong> 8 (Part 1) 8 (Part 2)<\/p>\n

Gear: <\/strong>Midwater trawl PT160 x 3; Multisampling pelagic cod-end with one fine mesh cod-end; Seabird 911 CTD; One metre vertical plankton sampling net 350\u00b5m mesh.<\/p>\n

Objectives: <\/strong>To conduct an acoustic survey to estimate the abundance and distribution of herring in the north western North Sea and north of Scotland between 58\u00ba30\u2019-62\u00baN and from the shelf edge to 2\u00baE, excluding Faroese waters and;<\/p>\n