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Expeditionsrapport IBTS, januari 2017

Bland, Barbara and Hjelm, Joakim (2017). Expeditionsrapport IBTS, januari 2017. Lysekil: (NL, NJ) > Department of Aquatic Resources, Sveriges lantbruksuniversitet. Aqua reports ; 2017:2
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Abstract

Havsfiskelaboratoriets trålexpeditioner i Västerhavet (Skagerrak och Kattegatt) genomförs två gånger årligen, i kvartal 1 och 3. Den franska bottentrålen GOV används för provtagningen av demersala arter. Under kvartal 1 används också en MIK-trål nattetid för provtagning av fisklarver. Under denna expedition gjordes totalt 47 giltiga tråldrag i hela området med GOV-trålen, två i Nordsjön, 26 i Skagerrak och 19 i Kattegatt. Eftersom vi i år fiskade två rutor i Nordsjön var vi tvungna att begränsa antalet stationer i Skagerrak, normalt 27 st till 26 st. I år hade Svenska Försvarsmakten tagit bort tillträdesförbudet och de stationer som inte fiskats sedan 2014 kunde nu fiskas. Vädret var under hela expeditionen gynnsamt. Den totala fångsten uppgick till drygt 12 ton och inkluderade 70 fiskarter. Den biologiska provtagningen, som innebär bland annat insamling av otoliter för åldersbestämning, gjordes på de viktigaste kommersiella arterna. Totalt togs 5 223 otoliter från 11 olika arter. MIK-trålningen resulterade i 66 godkända tråldrag med fångst av bland annat 271 sillarver, 4 skarpsillarver och 10 ållarver.

Authors/Creators:Bland, Barbara and Hjelm, Joakim
Title:Expeditionsrapport IBTS, januari 2017
Alternative abstract:
LanguageAbstract
English

The Institute of Marine Research is responsible for the trawl survey in the Skagerrak, a marginal sea to the North Sea and the Kattegat, a transition area to the Baltic Sea. This survey is conducted twice annually, in quarters 1 and 3. The French bottom trawl GOV is used for sampling demersal species while in Q1 only, a MIK trawl is used at night for sampling fish larvae.During this survey a total of 47 valid hauls were towed in the whole area using the GOV-trawl, two hauls in the North Sea, 26 in the Skagerrak and 19 in the Kattegat. This year, the Swedish Armed Forces' revoked the previous year's disallowance and we subsequently fished three hauls we hadn't fished since 2014. During the whole survey the weather remained favourable. The total catch amounted to a good 12 tonnes and included 70 species of fish. The biological sampling, which includes collection of otoliths for age analysis, was done on the most important commercial species. In total 5223 otoliths were collected from 11 different species. MIK trawling resulted in 66 valid trawl hauls with catches of 271 herring larvae, 4 sprat larvae and 10 eel larvae and several other species.

Series/Journal:Aqua reports (12351367)
Year of publishing :2017
Number:2017:2
Number of Pages:20
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 printed version:978-91-576-9474-4
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
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, trawling, population dynamics, surveys, skagerrak, kattegat
Keywords:fisk, beståndsuppskattning, Skagerrak, Kattegatt
URN:NBN:urn:nbn:se:slu:epsilon-e-4104
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-4104
ID Code:14240
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Aquatic Resources
External funders:European Commission and Swedish Agency for Marine and Water Management
Deposited By: SLUpub Connector
Deposited On:13 Apr 2017 10:13
Metadata Last Modified:16 Jun 2017 19:34

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