BIGHT: A NEARSHORE - OFFSHORE COMPARISON
5. Conclusions and outlook
The results of this study show that offshore cultivation of mussel, according to the definitions, does not offer a guarantee of superior health and quality of cultivated organisms. The example of the German Bight shows that high concentrations of pollutants are not limited to nearshore waters. Contaminants are transported by air or currents up to the outer border of the 12 nautical miles zone. Future testing sites should therefore be located further offshore to ensure clearly different habitat conditions in terms of water quality and contaminant loads. The results concerning the health status of investigated mussels are worrisome, since impacts of environmental conditions of the German Bight are already detectable in young mussels (12-16 months). Accumulation effect during their whole life span will increase measured negative impacts.
Chapter 09 Health and growth performance 121
Acknowledgements
The authors are grateful to the Water and Shipping Authority (WSA) of Bremerhaven, Germany the State Fishery Authority of Bremerhaven, Germany and the Fishermen of Lower Saxony, Germany who generously allowed using the offshore test field in the Weser estuary near the lighthouse Roter Sand for the mussel cultivation experiments in the years 2006 and 2007. The authors are especially thankful to the WSA, who organized modification, shipping and anchoring of the buoyancy in the testing area. Further, we would like to thank the Niedersachsen Port Authorities (NPorts) of Wilhelmshaven, Germany, who generously allowed us to use the cargo bridge at the Jade estuary for cultivating nearshore mussel on collector ropes. Special thanks go further to captain Charly Lürs and his crew of the AWI research vessel FK Uthörn who guided and supported us at every ship excursion.
The sampling at the offshore site Roter Sand would not have been possible without the help of the AWI research diving group who spent much time and energy to obtain the mussels for all the analyses. Further the authors would like to thank the colleagues from the Federal Maritime Hydrographic Agency (BSH) in Hamburg, Germany, for providing detailed data of the contaminant situation in the sampling sites. Finally, we would like to thank Jörn Marcks (AWI) for his substantial support in the lab. This work was realised within the project FV 168 MytiFit financed by the Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany, and the Ministry of Construction, Environment, Traffic and Europe of the Federal State of Bremen, Bremen, Germany.
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