Thünen: Rohlf, Norbert, Dr.

Dr. Norbert Rohlf

Herwigstraße 31
27572 Bremerhaven

Population dynamics and assessment of pelagic fish stocks (herring, mackerel, horse mackerel, blue whiting and sprat) in the North Sea and North Atlantic
Biological monitoring of German fisheries activities and derivation of protection measures for fish stocks
Conduction of international herring larvae surveys in the North Sea
Recruitment research: Investigation of fish eggs and larvae in terms of species composition and size

since 2006: Scientist at the Institute of Sea Fisheries
2000 – 2006: Freelance work as consultant. Main focus on fish eggs, larvae surveys and video-aided image analyses for plankton identification
2000: Dissertation. Doctor’s thesis title: „Verhaltensänderungen der Larven des Ostseedorsches (Gadus morhua callarias) während der Dottersackphase“ (in German)
1994 – 2000: Scientist at the Institute of Marine Research in Kiel. Collaborate in projects on the impact of fisheries on fish stock recruitment in the Baltic. Performance of herring larvae surveys in the North Sea from 1998 onwards
1994: Master of Science at the Christian-Albrechts-University in Kiel. Thesis title: „Wachstumsuntersuchungen an den Otolithen mariner Fischlarven“ (in German).

Working Group - Committee	Tasks
ICES
Herring Assessment Working Group (HAWG)	The working group assess the status of different herring and sprat stocks in the North Sea, West of Scotland and in Irish and Celtic waters.
Working Group on Atlantic Fish Larvae and Egg Surveys (WGALES)	The focus of this group is on fish eggs and larval development and early life strategies. It also serves as a general forum for discussion on matters concerning egg and larvae survey.
Working Group for Surveys of Ichthyoplankton in the North Sea and adjacent seas (WGSINS)	Group members plan and execute six different Ichthyoplankton surveys in the North Sea and adjacent seas. They calculate biomass and recruitment indices for assessment purposes and define the standards in sampling, post-processing and species identification in the specific surveys.
Workshop on North Sea Stocks Management Strategy Evaluation (WKNSMSE)	The group has evaluated different management strategies for key North Sea roundfish stocks.
Advice Drafting Group Bay of Biscay (ADGBBI)	The group review the advice on fishing opportunities for Bay of Biscay and Iberian fish stocks, prepared by the relevant working group (WGBIE).

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