Wave energy conversion is a potential clean electric energy conversion with basically no emissions during operation. Still there are issues considering impacts on the environment; for example underwater sounds, electromagnetism and reef effect needs to be examined. The concept wave energy conversion has existed for many years but only recently different concepts such as Pelamis, Archimedes Wave Swing, Wave Dragon and the Lysekil Project, has actually been tested in real offshore environment [1, 2, 3, 4], and have closed in on commercialisation. There are some studies on the environmental effects concerning Wave Energy Converters (WECs) and reef effect, showing an increase in biomass and biodiversity locally around the WEC. Fouling species contributed the most the increased biodiversity, but also motile organisms such as different species of fish and crustaceans [5, 6, 7]. Although a WEC offers hard substrate for organisms to settle on which in turn attracts more free swimming organisms, a WEC is not a silent substrate. The operation of a WEC will produce vibrations and sound which may affect the surrounding marine life. Little is known of the effects of different anthropogenic sounds in the ocean, but the concern about the effects on fish and marine mammals is increasing [8, 9 10]. Ambient noise is the background noise in the oceans and is the sound field against biological which signals must be detected within. It consists of both natural (wind, waves, seismic activity e.g.) and anthropogenic sounds (shipping, pile driving, bridges, wind power, e.g.). Wave power may contribute to the ambient noise in the oceans, both locally and globally, but how and to what extent?
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