Simon, the Norwegians haven't killed more than 500-600 because they realize there's no market without the Japanese. Since the Japanese won't buy North Sea Minke meat from them, they sorta have to go out and hunt because someone is paying them to.
Dave
They are not claiming it to be research at all, unlike the Japanese. It's all out hunting. The norwegians in all probability are culling the minke whales so that they don't compete with the fishing boats.
The funny thing is that with all fisheries policies around the world, 'sustainability' means anything that humans can harvest it continuously. However, with certain bounties like the sardines in Africa or the herring in the fjords, many animals are significant consumers and thus should be factored in.
Sperm whales are estimated to consume over 150 tons of cephalopods and fish per capita per year. That's more than all the scandanavian states together. I can't see the Baleen Minkes being that much better when it comes to consumption.