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Institute of Marine Research

Barents Sea Northeast Arctic haddock bottom trawl index in winter

Recommended citation:
Sigbjørn Mehl, Edda Johannesen (2019) Barents Sea Northeast Arctic haddock bottom trawl index in winter
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Abstract
This is a parent site of all data sets for Barents Sea Northeast Arctic haddock bottom trawl index in winter over several years. It contains the latest data set and links to previous versions. The survey indices by age group for bottom trawl and acoustic estimates for haddock from the winter survey (January-March) in the Barents Sea are calculated as described in Mehl et al. 2016 (bottom trawl) and Mehl et al. 2018 (acoustic). Mean length and weight at age is also calculated. Updated data series are provided in the annual survey reports (e.g. Mehl et al. 2019). The series go back to 1981, but StoX estimates go back only to 1994. The survey has been a Joint Norwegian-Russian one from 2000 onwards except in the years 2006, 2007 and 2017. The survey area is divided into eight main areas and 26 strata. In 2014, the investigated area was enlarged by three new strata in northwest, 24-26. These strata are, however, not included in the standard calculations of indices. Note also that prior to 1994, the area covered was smaller and no adjustments have been made for that. In the early period (1981-1995) there were also some gear changes, for which adjustments have been made, these changes are also described in the reports referred to. In 1997, 1998 and 2007 only the Norwegian EEZ (NEZ) and parts of the Svalbard area (S) was covered. The indices for cod and haddock have therefore been raised to also represent the Russian EEZ (REZ) (Mehl et al. 2016, 2018). In 2006, there was not a complete coverage in southeast due to restrictions. The observations in the partially covered strata 7 were extrapolated to the full strata, and the observations in the partially covered strata 13 were extrapolated to the same area as covered in 2005. In 2012 the coverage was incomplete in the eastern areas, and the cod and haddock swept area estimates within the covered area were raised by the “index ratio by age” observed for the same area in 2008-2011 (ICES 2012). The scaling factor (“index ratio”) for estimating adjusted total from <Total – area D’> was the average ratio by age for Total/(Total – area D’) in the years 2008-2011 (Aglen et al. 2012). In 2017, the Norwegian vessel was not allowed to operate south of 70º 10’ N and west of 41º 00 º E, and no Russian vessel participated in the survey. Only a small part of strata 7 was covered, and strata 13, 15, 17 and 20 were not covered. The cod, haddock, Greenland halibut and beaked redfish swept area estimates and cod and haddock acoustic estimates within the covered area were raised following the same procedure as for 2012. The scaling factor for estimating adjusted total from <Total –strata 7 > was the average ratio by age for Total/(Total – (strata 7+13+15+17+20)) swept area indices in the years 2014-2016. All these adjustments are included in the StoX projects used for the calculations.
Scientific keywords:
EARTH SCIENCE> BIOLOGICAL CLASSIFICATION> ANIMALS/VERTEBRATES> FISH> RAY-FINNED FISHES> CODS/HADDOCKS
Key words:
Haddock
Data downloads
Type Description URL
PREVIOUS VERSION 1996 v.1 http://metadata.nmdc.no/metadata-api/landingpage/5d800f8e8c668c27aafe3f71b27d7b03
PREVIOUS VERSION 1999 v.1 http://metadata.nmdc.no/metadata-api/landingpage/f433dec9ee9830915926ed3b4048de25
PREVIOUS VERSION 2000 v.1 http://metadata.nmdc.no/metadata-api/landingpage/47487efff3d3004967c1a5575f3541ca
PREVIOUS VERSION 2001 v.1 http://metadata.nmdc.no/metadata-api/landingpage/e47311ff855eb68853d4f8a06cbb586c
VIEW RELATED INFORMATION Johnsen et al. 2016 https://doi.org/10.1111/2041-210X.13250
PREVIOUS VERSION 2002 v.1 http://metadata.nmdc.no/metadata-api/landingpage/e0c15910fe0b5855b642ccac8e72c422
PREVIOUS VERSION 2003 v.1 http://metadata.nmdc.no/metadata-api/landingpage/6851e38bdc8b4571077b618073ec04e6
PREVIOUS VERSION 2004 v.1 http://metadata.nmdc.no/metadata-api/landingpage/89a364920cab423d89cbb2271d1abac4
PREVIOUS VERSION 2005 v.1 http://metadata.nmdc.no/metadata-api/landingpage/8251e4603fd2e78a3dcd2ca6644474f7
PREVIOUS VERSION 2008 v.1 http://metadata.nmdc.no/metadata-api/landingpage/6db5e503fe453c7ec27f1f11400324e5
PREVIOUS VERSION 2009 v.1 http://metadata.nmdc.no/metadata-api/landingpage/de92f4ee040cccd5fe6ce53cab91eff5
VIEW RELATED INFORMATION Mehl et al. 2016 https://www.hi.no/resources/publikasjoner/fisken-og-havet/2016/fh_10-2016_stox_revision_of_the_swept_area_abundance_indices_1994-2016_pdf_print.pdf
PREVIOUS VERSION 2010 v.1 http://metadata.nmdc.no/metadata-api/landingpage/b666474ec49a8c58cbc3d5fec8a26641
PREVIOUS VERSION 2011 v.1 http://metadata.nmdc.no/metadata-api/landingpage/8a8f323f4ea83cdda101f3ac774e9fe7
PREVIOUS VERSION 2013 v.1 http://metadata.nmdc.no/metadata-api/landingpage/815f886880254c38e41835d3e9410647
PREVIOUS VERSION 2014 v.1 http://metadata.nmdc.no/metadata-api/landingpage/ec85d2efb2911f72848d5b7d1a505128
PREVIOUS VERSION 2015 v.1 http://metadata.nmdc.no/metadata-api/landingpage/08b3170b23815f9322c1976c735d574e
PREVIOUS VERSION 2016 v.1 http://metadata.nmdc.no/metadata-api/landingpage/60119b1513b5d8b4c6c9404b4e0bb05c
PREVIOUS VERSION 2018 v.1 http://metadata.nmdc.no/metadata-api/landingpage/0ff4e132fd0ad6901d0e533eb5a0efad
PREVIOUS VERSION 2019 v.1 http://metadata.nmdc.no/metadata-api/landingpage/6d130cb8c9781d450739fe957ba9596c
PREVIOUS VERSION 2017 v.1 http://metadata.nmdc.no/metadata-api/landingpage/e2993eec10db25de035519591fa08e23
PREVIOUS VERSION 1994 v.1 http://metadata.nmdc.no/metadata-api/landingpage/1467468c814f50370690b6c2572fb017
PREVIOUS VERSION 1995 v.1 http://metadata.nmdc.no/metadata-api/landingpage/0303d639dd51454bd9d7a92c6409dfed
GET DATA StoX folder https://ftp.nmdc.no/nmdc/IMR/surveytimeseries/Barents+Sea+Northeast+Arctic+haddock+bottom+trawl+index+in+winter/Had_2019_1.zip
PREVIOUS VERSION 1997 v.1 http://metadata.nmdc.no/metadata-api/landingpage/ace3a31ce6846c35334c69a376697e33
PREVIOUS VERSION 1998 v.1 http://metadata.nmdc.no/metadata-api/landingpage/1b39774a513c71cea015a953f9ee24a4
PREVIOUS VERSION 2006 v.1 http://metadata.nmdc.no/metadata-api/landingpage/ed2d0a34aac0b4b83041927f669e8eac
PREVIOUS VERSION 2007 v.1 http://metadata.nmdc.no/metadata-api/landingpage/3e2302f44e00ded7d4f48be1d6640f4f
PREVIOUS VERSION 2012 v.1 http://metadata.nmdc.no/metadata-api/landingpage/3b5af134484043e06e3f58df91871a71
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2939769af6d1d6527dd31dcde70da9ac.xml
No Spatial coverage