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Expeditionsrapport BITS, februari 2016

Casini, Michele and Lövgren, Olof (2016). Expeditionsrapport BITS, februari 2016. Lysekil: (NL, NJ) > Department of Aquatic Resources, Sveriges lantbruksuniversitet. Aqua reports ; 2016:13
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Abstract

Expeditionen genomfördes med hjälp av TV3L bottentrål enligt Baltic International Trawl Survey (BITS) manual (Anon., 2014a). Sverige tilldelades 50 slumpvis utvalda stationer. 47 giltiga hal utfördes. Tre stationer kunde inte fiskas p.g.a. tillträdesförbud utfärdat av Svenska Försvarsmakten (tabell 3).

Sammantaget genomfördes 47 drag med TV3L bottentrål inklusive 10 fiktiva drag som inte trålades eftersom syrekoncentrationen nära botten var <1,5 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 20 fiskarter. Totalfångsten i vikt dominerades av sill, skarpsill, torsk, skrubbskädda, rötsimpa och rödspätta.

Hydrografiparametrar, bl. a. salthalt, temperatur och syrekoncentration, observerades och mättes på de flesta trålstationerna. I denna rapport visas enbart syrekoncentrationen vid botten.

Authors/Creators:Casini, Michele and Lövgren, Olof
Title:Expeditionsrapport BITS, februari 2016
Alternative abstract:
LanguageAbstract
English

The survey was conducted using the TV3L demersal trawl according to the Baltic International Trawl Survey (BITS) manual (Anon., 2014a). Sweden was assigned 50 randomly selected hauls. 47 valid hauls were performed.. Three stations could not be trawled because the access prohibition to some areas from the Swedish Armed Forces (Table 3).

Altogether was performed 47 hauls with TV3L demersal trawl including 10 fictitious hauls which were not trawled because the oxygen concentration close to the bottom was <1.5 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 20 fish species were caught. The total catch, in terms of weight, was dominated by herring, sprat, cod, flounder, shorthorn sculpin and plaice.

The hydrographic conditions were observed and measured at most of the stations. Only the oxygen concentration at the bottom is presented here.

Series/Journal:Aqua reports (12351367)
Year of publishing :2016
Number:2016:13
Number of Pages:18
Place of Publication:Lysekil
Publisher:Sveriges lantbruksuniversitet, Institutionen för akvatiska resurser
Associated Programs and Other Stakeholders:SLU - Environmental assessment > Programme Coastal and sea areas
ISBN for electronic version:978-91-576-9427-0
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
Agrovoc terms:fishes, surveys, biological analysis, trawlers, hydrology, Baltic sea
Keywords:Östersjön, bottentrålexpedition, biologisk provtagning, hydrografiförhållanden, fiskbeståndsuppskattning
URN:NBN:urn:nbn:se:slu:epsilon-e-4216
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-4216
ID Code:14374
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Aquatic Resources
Deposited By: SLUpub Connector
Deposited On:01 Jun 2017 08:59
Metadata Last Modified:01 Jun 2017 09:08

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