Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Clupea	264	21.09.2012 - 05.10.2012		Baltic Sea

Fahrtleiter Chief Scientist	Institut Institute	Auslaufhafen Port of departure	Einlaufhafen Port of return	Stationskarte Station map	Schiffsroute Trackchart
von Dorrien Christian	Thunen-Institut fur Ostseefischerei	Kiel	Rostock

Ziel der Reise / Objectives of Cruise:

A harbour porpoise alerting device (PAL), recently developed by the company F3 (Boris Culik, Kiel) was tested in the field on its effectiveness. To this end, FRV Clupea anchored in the Little Belt near Fredericia, Denmark. Up to 5 buoys, each equipped with a PAL and a passive acoustic monitoring device (CPOD), were simultaneously deployed on both sides of Little Belt (Fig. 1). Simultaneously, porpoise surfacing positions were tracked from land via theodolite and from sea using observers on board FRV Clupea. Total field effort during acceptable weather conditions was 197.5 hours. Porpoises were detected within 300 m of individual buoys for a total of 8.2 hours. Results gained during the cruise are currently analyzed and used to further improve the PAL signals.

Messungen / Measurements