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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:
LanguageAbstract
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.

Year of publishing :2020
Number:2020:6
Number of Pages:17
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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