Deutsches Ozeanographisches
Datenzentrum Inventur der Solea-Reise 740 (DOD-Ref-No.20170149)
Inventory of Solea Cruise 740 (DOD-Ref-No.20170149)

Plattform
Platform
Reise-Nr.
Cruise-No.
Zeitraum
Period
Projekt
Project
Arbeitsgebiet
Working area
Solea 740 04.10.2017 - 23.10.2017 BIAS
 
Arkona Basin Kattegat Baltic Sea Western Baltic Sea  

Fahrtleiter
Chief Scientist
Institut
Institute
Auslaufhafen
Port of departure
Einlaufhafen
Port of return
Stationskarte
Station map
Schiffsroute
Trackchart
Schaber Matthias Thunen-Institut fur Ostseefischerei Kiel Rostock Karte
Map
 

Ziel der Reise / Objectives of Cruise:

Solea 740:The cruise was part of an international hydroacoustic survey providing information on stock parameters of small pelagics in the Baltic Sea, coordinated by the ICES Working Group of International Pelagic Surveys (WGIPS) and the ICES Baltic International Fish Survey Group (WGBIFS). FRV Solea participated for the 30th time. The survey area covered the western Baltic Sea including Kattegat, Belt Sea, Sound and Arkona Sea (ICES Subdivisions SD 21, 22, 23 and 24). Altogether, 1167 nmi (plus 132 nmi night and daytime transects for comparison) of hydroacoustic transects were covered. In the majority of sampled rectangles, mean NASC values per nautical mile were distinctly lower than the values measured in 2016 and also often lower than the long-time mean values. Only in altogether seven rectangles in ICES SD 21, 22 and 24, mean NASC values were occasionally distinctly higher than in the previous year (and in 3 cases than the long-time mean). In SD23, as in 2016, unusually low NASC values (even significantly lower than in the previous year) were measured, indicating absence of the dense aggregations of herring usually observed in that area at this time of the year. It has to be mentioned, that during a repetition of the transect in SD23 during daytime for comparison, NASC values measured and echorecordings clearly showed presence of a significant amount of clupeids in the area. For species allocation and identification, altogether 57 fishery hauls were conducted. Vertical hydrography profiles were measured on 87 stations.

Messungen / Measurements

Institut
Institute
Wissenschaftler
Scientist
Anzahl
Number
Einheit
Unit
Typ der Messungen
Type of measurements
Kommentar
Comments
Daten im DOD
Data in DOD
VTISF Schaber Matthias 57 hauls B14
Pelagic fish
. no
VTISF Schaber Matthias 2161 km B28
Acoustic reflection on marine organisms
NASC values measured with an EK80 Scientific Echosounder operating 4 split-beam transducers (38, 70, 120, 200 kHz).. no
VTIOSF Grohsler Tomas 86 stations H00
Stations
- yes
VTISF Schaber Matthias 87 deployment H10
CTD-Stations
. no
BSH unbekannt 86 stations H10
CTD-Stations
- yes
23.3.2024