This is a reef in the danish strait Little Belt or Lillebælt. At this reef sea trout will hunt at night for small fish and shrimp. Some of the small fish can be seen in the beginning of the video. Recorded with a little Pentax Optio W20. Take a much CLOSER LOOK at the small fish and shrimps in my videos "What the Sea Trout eats - Havørredens livretter"