Distribution of mesopelagic fish in the Scotia Sea from RMT25 and pelagic trawls deployed from RRS James Clark Ross and RRS John Biscoe

Mesopelagic fish were sampled in the Scotia Sea using a 25 m2 opening and closing rectangular midwater trawl during five research cruises on RRS John Biscoe and RRS James Clark Ross. Nets sampled discrete layers, from the surface to 1000 m during austral spring, summer and autumn. The data include 17726 individual fish records from 66 taxa, the most abundant of which were myctophids of the genera Electrona, Gymnoscopelus, Krefftichthys and Protomyctophum and bathylagids (Bathylagus sp.). Length (standard length, total length or pre-anal fin length) was measured for the majority of specimens (16837), with sex and weight data also collected for many.

The work was conducted as part of the BAS Ecosystems Programmes funded by the UK Natural Environment Research Council.

Date (Creation): 2021-03-08

Date (Revision): 2021-03-08

Date (Publication): 2021-03-08

Date (released): 2021-03-08

Edition: 1.0

Unique resource identifier: https://doi.org/10.5285/f4dfc0ee-4f61-47c5-a5a8-238e02ff2fdd

Codespace: doi

Unique resource identifier: GB/NERC/BAS/PDC/01474

Codespace: https://data.bas.ac.uk/

Other citation details: Please cite this item as: Collins, M., Piatkowski, U., & Saunders, R. (2021). Distribution of mesopelagic fish in the Scotia Sea from RMT25 and pelagic trawls deployed from RRS James Clark Ross and RRS John Biscoe (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/f4dfc0ee-4f61-47c5-a5a8-238e02ff2fdd

Credit: No credit.

Status: Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
British Antarctic Survey	Collins, Martin		Author
GEOMAR, Helmholtz Centre for Ocean Research	Piatkowski, Uwe		Author
British Antarctic Survey	Saunders, Ryan		Author
NERC EDS UK Polar Data Centre		PDCServiceDesk@bas.ac.uk	Point of contact

Maintenance and update frequency: As needed

Maintenance note: Completed

Global Change Master Directory (GCMD) Science Keywords

Theme

Bathylagus
Myctophidae
Scotia Sea
Southern Ocean
distribution

GEMET - INSPIRE themes, version 1.0

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Spatial representation type: Text, table

Language: English

Character set: UTF8

Topic category

Biota
Environment
Oceans

Begin date: 1991-01-01

End date: 1991-02-17

Supplemental Information: It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk.

Title: European Petroleum Survey Group (EPSG) Geodetic Parameter Registry

Date (Publication): 2008-11-12

Cited responsible party

Organisation name	Individual name	Electronic mail address	Role
European Petroleum Survey Group		EPSGadministrator@iogp.org	Publisher

Unique resource identifier: urn:ogc:def:crs:EPSG::3031

Version: 6.18.3

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Distributor contact

Organisation name	Individual name	Electronic mail address	Role
NERC EDS UK Polar Data Centre		PDCServiceDesk@bas.ac.uk	Distributor

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text/plain
text/csv

Units of distribution: bytes

Transfer size: 1153434

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WWW:LINK-1.0-http--link	https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=f4dfc0ee-4f61-47c5-a5a8-238e02ff2fdd	Get Data

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WWW:LINK-1.0-http--link	https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=f4dfc0ee-4f61-47c5-a5a8-238e02ff2fdd	Get Data

Hierarchy level: Dataset

Statement: Methodology:

Data were obtained from RMT 25 nets deployed from the surface to 1000 m during five research cruises undertaken in the Scotia sea region, including around South Georgia. Cruise JB11 (Piatkowski et al., 1994) was undertaken during January 1991, JR100 was April 2004, with JR161, JR177 & JR200 (Collins et al., 2012) undertaken during austral spring (Nov 2006), summer (Jan 2008) and autumn (March 2009) respectively. During JR100 additional samples were collected with an International Young Gadoid Pelagic Trawl (IYGPT).

The RMT25 (see Piatkowski et al., 1994) consists of two nets that are opened and closed on command to sample discrete depth layers. The net was monitored in real-time using a custom-built net monitoring system that logged depth and ambient temperature. Each net had a theoretical mouth opening of 25 m2, with a cod-end mesh of 5 mm and was towed obliquely at 2.5 knots for 30 - 60 min in each depth horizon. The net was fitted with a protected cod-end to keep captured animals in good condition. Nets sampled discrete layers from the surface to 1000 m. Full station details and sampling methods are included in Piatkowski et al. (1994) and Collins et al. (2008, 2012).

Net haul catches were sorted to the lowest taxonomic level using published guides (Gon and Heemstra, 1990; Hulley, 1981), and our own reference collection and experience. Species names follow the World Register of Marine Species, but we have used Lampanyctus rather than Nannobrachium for Lampanyctus achirus. Total catch weights were obtained for each fish species using a motion compensated balance. All fish were measured (standard length (SL) and/or total length (TL) to the nearest mm. Each fish can be uniquely identified from a combination of Event - Net - ID. Most of the fish were sampled for stomach contents analysis (Shreeve et al., 2009; Saunders et al., 2015), otoliths and tissue samples were taken for biochemical analyses (Stowasser et al., 2009, 2012) and genetic studies (Van de Putte et al., 2012). Some fish were preserved whole and have been lodged with the Natural History Museum in London.

Data quality:

The data are largely consistent with the information published in Collins et al. (2008, 2012) and Piatkowski et al. (1994), but a few points to note:

1. Piatkowski et al. (1994) only included data from Station 1 and Station 2. Data from six additional nets from SW of South Georgia are included here.

2. Collins et al. (2012) only included stratified (non-target) nets, but the data includes fish caught in targeted hauls.

3. There is some uncertainty regarding the specific identification of fish of the genus Bathylagus. Collins et al. (2008) reported B. antarcticus, B. tenuis and B. gracilis, but preliminary molecular analysis (unpublished) suggests that there are four species. It is likely that the fish caught in the southern Scotia Sea are B. antarcticus, but others should be considered Bathylagus sp.

Metadata

File identifier: f4dfc0ee-4f61-47c5-a5a8-238e02ff2fdd XML

Metadata language: English

Character set: UTF8

Hierarchy level: Dataset

Hierarchy level name: dataset

Date stamp: 2021-03-08

Metadata standard name: ISO 19115 Geographic Information - Metadata

Metadata standard version: ISO 19115:2003(E)

Metadata author

Organisation name	Individual name	Electronic mail address	Role
NERC EDS UK Polar Data Centre		polardatacentre@bas.ac.uk	Point of contact

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