Subject: a few more questions

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I would consider the major threat to blue whale survival to be alteration or 
destruction of habitat.  This may be as subtle as increased sound in the 
ocean, or a change in surface water temperatures and circulation that would 
affect food abundance and supply.

I have never heard of a whale watching boat striking a blue whale. And have 
not seen where large shipping interests have struck a blue whale.  I would be 
interested in reading your sources on these incidents concerning blue whales. 
 Collisions between whale watching boats and any species of whale are very 
rare.  A major concern in the survival of North Atlantic right whales are the 
numbers of contacts between very large ships and right whales, as well as 
entanglements.  I would refer you to the very fine work done by Scott Kraus 
and Amy Knowlton and Phil Hamilton and others at the New England Aquarium in 
Boston.

Thanks again!!

Scott Mercer

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