Expeditionsrapport BITS, november 2018

Lövgren, Olof (2019). Expeditionsrapport BITS, november 2018. Lysekil: (NL, NJ) > Department of Aquatic Resources, Sveriges lantbruksuniversitet. Aqua reports ; 2019:5
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Abstract

Expeditionen genomfördes med hjälp av en TV3L bottentrål enligt Baltic International Trawl Survey (BITS) manual (ICES, 2017). Sverige tilldelades 30 slumpvis utvalda stationer. Två stationer kunde inte fiskas p.g.a. tillträdesförbud utfärdat av Svenska Försvarsmakten.

Totalt genomfördes 30 drag med TV3L bottentrål inklusive 4 syrefria drag som inte trålades eftersom syrekoncentrationen nära botten var <0,5 ml/l (de inkluderas i beståndsuppskattningen som 0-fångst) och täckte delar av områdena SD 25, 26, 27 och 28 i år. Under hela undersökningen registrerades akustiska data kontinuerligt.

Under denna undersökning fångades totalt 23 olika fiskarter. Totalfångsten i vikt dominerades av sill, skarpsill, torsk, hornsimpa och skrubbskädda.

Hydrografiska parametrar såsom salthalt, temperatur och syrekoncentration, observerades och mättes på samtliga trålstationer. I den här rapporten visas syrekoncentrationen ca 1 meter ovanför botten.

Authors/Creators:

Lövgren, Olof

Title:

Expeditionsrapport BITS, november 2018

Alternative abstract:

Language

Abstract

UNSPECIFIED

The survey was conducted using the TV3L demersal trawl according to the Baltic International Trawl Survey (BITS) manual (ICES. 2014). Sweden was assigned 30 randomly selected hauls. Two stations could not be trawled because the Swedish Armed Forces denied access in some of the areas.

In total 30 valid hauls were performed with TV3L demersal trawl including 4 hauls with oxygen deficiency which were not trawled because the oxygen concentration close to the bottom was <0.5 ml/l (however they are included in stock assessment as zero catch) and covered parts of the areas SD 25, 26, 27 and 28 this year. During the whole survey, acoustic data were continuously recorded.

During this survey a total of 23 fish species were caught. Herring, sprat, cod, fourhorn sculpin and flounder dominated the total catch, in terms of weight.

The hydrographic conditions were observed and measured on every station. Only the oxygen concentration at the bottom is presented in the report.

Series/Journal:

Aqua reports (12351367)

Year of publishing :

2019

Number:

2019:5

Number of Pages:

Place of Publication:

Lysekil

Publisher:

Institutionen för akvatiska resurser, Sveriges lantbruksuniversitet

Associated Programs and Other Stakeholders:

SLU - Environmental assessment > Programme Coastal and sea areas

ISBN for electronic version:

978-91-576-9649-6

Language:

Swedish

Publication Type:

Report

Article category:

Other scientific

Full Text Status:

Public

Agris subject categories.:

M Aquatic sciences and fisheries > M01 Fisheries and aquaculture - General aspects
M Aquatic sciences and fisheries > M40 Aquatic ecology

Subjects:

(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology

Keywords:

Östersjön, bottentrålexpedition, biologisk provtagning, hydrografiförhållanden, fiskbeståndsuppskattning

URN:NBN:

urn:nbn:se:slu:epsilon-p-99548

Permanent URL:

http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-99548

ID Code:

16072

Faculty:

NJ - Fakulteten för naturresurser och jordbruksvetenskap

Department:

(NL, NJ) > Department of Aquatic Resources

Deposited By:

SLUpub Connector

Deposited On:

16 Apr 2019 09:51

Metadata Last Modified:

16 Apr 2019 09:51

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