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Dan, good points... the MCT experience, with a prototpye in seal country, seems to be that marine mammals stay away - most in any case are used to dealing with machinery in the form of ships and know to stay away from propellors (incidentally, the tip speed of our rotor blades is about 12 m/s - less than the hull speed of many ships and much less than the propellor speed). People at one time worried about windmill blade strikes on birds, but these didn't materialise except when they put the windmills directly in a migration route like Terrifa. And tidemill blade tips go 6 times as slowly as the tips on wind turbine rotors.

Ref your comment about just going with windmills, these are far more intrusive than tidemills would be... can you just imagine the backlash there will be in the UK to 10,000 more onshore wind turbines (today's Daily Telegraph)....? Actually we would all benefit from a mix of wind, wave and tide, as these spread the generation and you need less back-up firm generating capacity than if you have just one renewable alone. So I can't agree with your last comment!