Sammanfattning
Havsfiskelaboratoriets trålexpeditioner i Västerhavet (Skagerrak och Kattegatt)genomförs två gånger årligen, i kvartal 1 och 3.Den franska bottentrålen Grande Ouverture Verticale (GOV) används för provtagningenav demersala arter. Under kvartal 1 används också en Methot Isaac Kidd (MIK) -trålnattetid för provtagning av fisklarver.Under denna expedition gjordes totalt 48 tråldrag i hela området med GOV-trålen. Avdessa bedömdes 43 tråldrag som giltiga för att inkluderas i beståndsuppskattningen, 25 iSkagerrak och 18 i Kattegatt. Den totala fångsten i 48 drag under expeditioneninkluderade 69 fiskarter.Den biologiska provtagningen, som innebär bland annat insamling av otoliter föråldersanalys, gjordes på de viktigaste kommersiella arterna. Totalt togs 4 791 otoliterfrån 11 olika arter.MIK-trålningen resulterade i 57 godkända tråldrag med fångst av bl. a. 398 sillarver, treskarpsillarver och sju ållarver.
The Institute of Marine Research is responsible for the trawl survey in the Skagerrak andthe Kattegat areas of the North Sea. This survey is conducted twice annually, in quarters1 and 3. The French bottom trawl Grande Ouverture Verticale (GOV) is used forsampling demersal species while, only in quarter 1 (Q1), a Methot Isaac Kidd(MIK) trawl is also used at night for sampling fish larvae.During this survey a total of 48 hauls were towed in the whole area using the GOVtrawl.In total 43 of these hauls were defined as valid for the stock assessment work,25 in the Skagerrak and 18 in the Kattegat. The total catch in 48 hauls during thesurvey included 69 species of fish.The biological sampling, which includes collection of otoliths for age analysis, wasdone on the most important commercial species. In total 4 791 otoliths were collectedfrom 11 different species.MIK trawling resulted in 57 valid trawl hauls with catches of 398 herring larvae, threesprat larvae and seven eel larvae and several other species.
The Institute of Marine Research is responsible for the trawl survey in the Skagerrak andthe Kattegat areas of the North Sea. This survey is conducted twice annually, in quarters1 and 3. The French bottom trawl Grande Ouverture Verticale (GOV) is used forsampling demersal species while, only in quarter 1 (Q1), a Methot Isaac Kidd(MIK) trawl is also used at night for sampling fish larvae.During this survey a total of 48 hauls were towed in the whole area using the GOVtrawl.In total 43 of these hauls were defined as valid for the stock assessment work,25 in the Skagerrak and 18 in the Kattegat. The total catch in 48 hauls during thesurvey included 69 species of fish.The biological sampling, which includes collection of otoliths for age analysis, wasdone on the most important commercial species. In total 4 791 otoliths were collectedfrom 11 different species.MIK trawling resulted in 57 valid trawl hauls with catches of 398 herring larvae, threesprat larvae and seven eel larvae and several other species.
| Originalspråk | Svenska |
|---|---|
| Förlag | Institutionen för akvatiska resurser, Sveriges lantbruksuniversitet |
| Antal sidor | 20 |
| ISBN (tryckt) | 978-91-576-9232-0 |
| Status | Publicerad - 2014 |
Publikationsserier
| Serie | Aqua reports |
|---|---|
| Numrering | 2014:7 |
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SLU-serie
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