Deutsches Ozeanographisches
Datenzentrum Inventur der Tridens II-Reise North Sea Herring Ac (DOD-Ref-No.20150464)
Inventory of Tridens II Cruise North Sea Herring Ac (DOD-Ref-No.20150464)

Plattform
Platform
Reise-Nr.
Cruise-No.
Zeitraum
Period
Projekt
Project
Arbeitsgebiet
Working area
Tridens II North Sea Herring Ac 22.06.2015 - 17.07.2015 NHAS
 
North Sea  

Fahrtleiter
Chief Scientist
Institut
Institute
Auslaufhafen
Port of departure
Einlaufhafen
Port of return
Stationskarte
Station map
Schiffsroute
Trackchart
Fassler Sascha IMARES, Wageningen UR, Institute for Marine Resources and Ecosystem Studies, Texel Scheveningen Scheveningen   

Ziel der Reise / Objectives of Cruise:

The objective was to carry out an hydro acoustic survey defining the abundance of herring and sprat in the North Sea, in co-operation with the institutes of Norway, Scotland, Denmark, and Germany. Calibration of the echosounder in a sheltered area, at Loch Eriboll, Scotland 58?30N - 004?41W. The first week of the whole 4 week survey period was used for calibration of the acoustic equipment in a sheltered location in Loch Eriboll. After successfully calibrating all acoustic systems, Tridens sailed to Aberdeen. Departure from Aberdeen harbour on Monday 29 June 8:00 UTC. At 16:15 UTC we took our first CTD and started the survey. We are now at 58.18N - 2.34W heading east. The first five days we covered the 58.18, 58.06, 57.49 and the 57.37 transects. There was herring on all three transects although not in overwhelming quantities. On friday 3 July we were at 57.37N-16W, almost at the western end of the transect. So far 8 hauls were carried out. Haul 1-4 and 7-8 consisted of 100% herring. Haul five consisted of 70% sprat and 30% herring. Haul 6 contained 5% Norway pout. Total amount of all catches was between 1700 and 7000 kg.

Messungen / Measurements

Institut
Institute
Wissenschaftler
Scientist
Anzahl
Number
Einheit
Unit
Typ der Messungen
Type of measurements
Kommentar
Comments
Daten im DOD
Data in DOD
IMARES Fassler Sascha 20 hauls B14
Pelagic fish
. no
IMARES Fassler Sascha 3216 km B28
Acoustic reflection on marine organisms
. no
IMARES Fassler Sascha 44 profiles H10
CTD-Stations
. no
23.3.2024