Expeditionsrapport BITS, november 2019

Lövgren, Olof (2020). Expeditionsrapport BITS, november 2019. (NL, NJ) > Department of Aquatic Resources, Sveriges lantbruksuniversitet. Aqua reports ; 2020:6
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Abstract

Expeditionen genomfördes med R/V Svea med hjälp av en TV3L bottentrål enligt Baltic International Trawl Survey (BITS) manual (ICES, 2017). Sverige tilldelades 33 slumpvis utvalda stationer. Alla hal kunde utföras.

Totalt genomfördes 33 tråldrag med TV3L bottentrål inklusive 8 syrefria tråldrag 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 25 olika fiskarter. Totalfångsten i vikt dominerades av sill, skarpsill, torsk, skrubbskädda, rödspätta och vitling.

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 2019

Alternative abstract:

Language

Abstract

UNSPECIFIED

The survey was conducted by the R/V Svea using the TV3L demersal trawl according to the Baltic International Trawl Survey (BITS) manual (ICES. 2017). Sweden was assigned 33 randomly selected hauls. All of the hauls could be performed.

In total 33 valid hauls were performed with TV3L demersal trawl including eight hauls with oxygen deficiency which were not trawled because the oxygen concentration close to the bottom was <0.5 ml/l (these hauls 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 25 fish species were caught. Herring, sprat, cod, flounder, plaice and whiting 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 Name/Journal:

Aqua reports

Year of publishing :

2020

Number:

2020:6

Number of Pages:

Publisher:

Institutionen för akvatiska resurser, Sveriges lantbruksuniversitet

ISBN for electronic version:

978-91-576-9748-6

Language:

Swedish

Publication Type:

Report

Article category:

Other scientific

Version:

Published version

Full Text Status:

Public

Subjects:

(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Fish and Aquacultural Science

Keywords:

Östersjön, bottentrålexpedition, biologisk provtagning, hydrografiförhållanden, fiskbeståndsuppskattning

URN:NBN:

urn:nbn:se:slu:epsilon-p-105273

Permanent URL:

http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-105273

ID Code:

16921

Faculty:

NJ - Fakulteten för naturresurser och jordbruksvetenskap

Department:

(NL, NJ) > Department of Aquatic Resources

Deposited By:

SLUpub Connector

Deposited On:

24 Apr 2020 13:29

Metadata Last Modified:

29 Apr 2020 10:45

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