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 |