Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Solea	662	02.10.2012 - 21.10.2012	BIAS	Baltic Sea

Fahrtleiter Chief Scientist	Institut Institute	Auslaufhafen Port of departure	Einlaufhafen Port of return	Stationskarte Station map	Schiffsroute Trackchart
Schaber Matthias	Institut fur Seefischerei der VTIG Hamburg	Rostock	Rostock	Karte Map

Ziel der Reise / Objectives of Cruise:

Objective: International acoustic survey for pelagic fish stocks in the Baltic Sea. 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 Planning Group for Herring Surveys. FRV "Solea" participated for the 25th time. The survey area covered the western Baltic Sea including Kattegat, Belt Sea, Ore Sound and Arkona Sea (ICES Subdivisions 21, 22, 23 and 24). Altogether, 1280 nm of regular and 184 nm of additional trial hydroacoustic transects were covered. NASC values per nautical mile were -like in the previous year- below the long time average values in some parts of the survey area especially in SD 21, 22 and 24. However, NASC values were distinctly above the values measured in the previous survey in 2011. Only in four rectangles of subdivisions 24 and 21 values were notably below those from 2011. As in the previous year, dense aggregations of herring could be recorded in the Ore Sound (SD 23). High scattering values were also recorded in different parts of the Arkona Sea (SD 24), which is in accordance with the high catches yielded in this area. NASC values from SD 22 were slightly above or distinctly higher (according to statistical rectangle) than corresponding values measured in the previous years. NASC values recorded in SD 21 (southern Kattegat) were mostly below the long term average but exceeded mean values in one rectangle. Additionally, values were also higher than those recorded in 2011 in northerly rectangles of the subdivision. For species allocation and identification, altogether 56 fishery hauls were conducted.

Messungen / Measurements