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Expeditionsrapport IBTS, augusti 2018

Bland, Barbara and Hjelm, Joakim (2018). Expeditionsrapport IBTS, augusti 2018. Lysekil: (NL, NJ) > Department of Aquatic Resources, Sveriges lantbruksuniversitet. Aqua reports ; 2018:19
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Abstract

Havsfiskelaboratoriets trålexpeditioner i Västerhavet (Skagerrak och Kattegatt) genomförs två gånger årligen, i kvartal 1 och 3. Fisket utförs med den franska bottentrålen GOV.

Under denna expedition gjordes totalt 45 giltiga tråldrag i hela området,  26 i Skagerrak och 19 i Kattegatt. Som del i IBTS-arbetsgruppens undersökning om ny förkortad standardiserad tråltid och kvantifiering av eventuella fångster under sättning och halning utfördes försök i anslutning till två standardstationer.

Totalt fångades 6,9 ton sill, 6,4 ton skarpsill  och 160 kg torsk. Viss rekrytering  till 0-gruppen i Kattegatt kan ses för sillen; skarpsillen visar en kraftig uppgång vilken domineras av Kattegatts 1-åringar medan torskfångsten var generellt låg med svag rekrytering i både Skagerrak och Kattegatt. Biologiska parametrar på individnivå samlas in på sill- och torskfiskar samt några plattfiskar. Totalt provtogs 3 712 individer från 11 olika arter med avseende på ålder och könsmognad.

Authors/Creators:Bland, Barbara and Hjelm, Joakim
Title:Expeditionsrapport IBTS, augusti 2018
Alternative abstract:
LanguageAbstract
UNSPECIFIED

The Institute of Marine Research is responsible for the trawl survey in the Skagerrak and the Kattegat areas of the North Sea. This survey is conducted twice annually, in quarters 1 and 3 and uses the French bottom trawl GOV as standard gear.

During this survey a total of 45 valid hauls were towed, 26 hauls in the Skagerrak and 19 in the Kattegat. This year two experimental hauls of reduced fishing duration was performed accompanied by two so called “zero hauls”, the latter carried out in order to identify possible catches during the shooting and the hauling procedure.

In all, 6.9 tonnes of herring, 6.4 tonnes of sprat and 160 kg of cod were caught. The herring catch was somewhat lower than last year, the largest fraction being the 0year-old fish in the Kattegat. Sprat showed a large increase dominated by the 1group in the Kattegat whereas cod catches reached an all-time low with very few recruits in both areas. Biological data was collected on clupeids and gadoids as well as some flatfish. In total 3 712 fish from 11 species were sampled for age and maturity determination.

Year of publishing :2018
Number:2018:19
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
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 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Fish and Aquacultural Science
(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:fisk, beståndsuppskattning, Skagerrak, Kattegat
URN:NBN:urn:nbn:se:slu:epsilon-p-97703
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-97703
ID Code:16244
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Aquatic Resources
Deposited By: SLUpub Connector
Deposited On:10 Jul 2019 12:50
Metadata Last Modified:15 Aug 2020 14:23

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