Baltic international acoustic survey report, October 2016

Niklas Larson

Baltic international acoustic survey report, October 2016

Niklas Larson

Institutionen för akvatiska resurser

Publikation: Bok/rapport/proceedings › Rapport › Forskning

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Sammanfattning

Internationellt koordinerade hydroakustiska surveyer har regelbundet genomförts av Havsfiskelaboratoriet i Lysekil sedan 1978 i Östersjön. Baltic International Acoustic Survey (BIAS), som utförs varje år i oktober, regleras under Europeiska Commissionens Data Collection Framework (DCF) och är obligatorisk för varje medlemsland i EU runt Östersjön. Sverige ansvarar för subdivision (SD) 27 och för delar av 25, 26, 28 samt 29. Dessutom har Sverige 2007-2012 tillsammans med Finland täckt SD30. Syftet med undersökningen är att bedöma sillbeståndet och resultaten rapporteras till Baltic International Fish Survey Working Group (WGBIFS) och Baltic Fisheries Assessment Working Group (WGBFAS), båda är arbetsgrupper inom International Council for the Exploration of the Sea (ICES). I år startade expeditionen med en kalibrering 2016-10-01 och 2016-10-02 i Gullmarsfjorden och slutade 2016-10-15 i Köpenhamn. Under surveyen samlas akustisk rådata in från ett kalibrerat vetenskapligt ekolod1 och pelagisk trålning utförs för att få information om art och längdfördelning. Den akustiska rådatan efterbehandlas i en mjukvara som 2011 byttes till en nyare programvara, LSSS 2. Trålfångsten analyseras och man tar fram en längdfördelning per art, dessutom tar man fram en åldersstruktur på målarterna som i detta fallet är sill, skarpsill och torsk. Därefter sammanställs de akustiska värdena med resultatet av analysen av trålfångsterna. De deltagande länderna skickar årligen de vetenskapligt ansvariga för surveyen och/eller expeditionsledarna, till arbetsgruppen WGBIFS. Där tas gemensamma riktlinjer och manualer fram och resultaten från varje land kombineras i en gemensam databas som rapporteras till WGBFAS, vilka använder BIAS resultaten tillsammans med annan information i en modell för att uppskatta det totala beståndet. Resultatet från 2016 års svenska BIAS survey bedömdes av WGBIFS vara representativt för mängden sill och skarpsill i Östersjön. Tidigare års resultat samt mer information kring BIAS samt WGBIFS arbete finns i arbetsgruppens årliga rapport. 3

Originalspråk	Engelska
Förlag	Department of Aquatic Resources, Swedish University of Agricultural Sciences
Antal sidor	23
Status	Publicerad - 2017

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Serie	Aqua reports
Numrering	2017:12

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Aqua reports

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abstract = "International hydroacoustic surveys have been conducted in the Baltic Sea since 1978. The starting point was the cooperation between the Institute of Marine Research (IMR) in Lysekil, Sweden and the Institute f{\"u}r Hochseefisherei und Fishverarbeitung in Rostock, German Democratic Republic in October 1978, which produced the first acoustic estimates of total biomass of herring and sprat in the Baltic Main basin (H˚akansson et al., 1979). Since then there has been at least one annual hydroacoustic survey for herring and sprat stocks and results have been reported to ICES. The Baltic International Acoustic Survey (BIAS), is mandatory for the countries that have exclusive economic zone (EEZ) in the Baltic Sea, and is a part of the Data Collection Framework as stipulated by the European Council and the Commission (Council Regulation (EC) No 199/2008 and the Commission DCF web page1 ). IMR in Lysekil is part of the Department of Aquatic Resources within the Swedish University of Agricultural Sciences and is responsible for the Swedish part of the EU Data Collection Framework and surveys in the marine environment. The Institute assesses the status of the marine ecosystems, develops and provides biological advices for managers for the sustainable use of aquatic resources. The BIAS survey is co-ordinated and managed by the ICES working group WGBIFS. The main objective of BIAS is to assess herring and sprat resources in the Baltic Sea. The survey will provide data to the ICES Baltic Fisheries Assessment Working Group (WGBFAS).",

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