Uh, the fish congregate at working drilling rigs, which have plenty of both electrical cables and vibration.
"Long explanations why for both - Windmills are not inert objects like an oil platforms, but actively sending out all of the above."
I would like to see those "explanations", because, based on my very close exposure to oil rigs, the "explanation" doesn't stand.
Its not like that - its a million times worse. There is no comparison between an isolated oil rig and a many miles long and many miles wide field of 1,000 foot high windmills generating huge number of mega-volts.
But then you can take your knowledge and reassure all the thousands of commercial fishermen and all those onshore jobs they generate, including all the seafood restaurants, that they are not going to be out of business when the European companies finish installing several thousand windmills in each of the dozen blocks. I’m sure none on them ever heard of oil rigs.
You do know that the commercial fishing there uses bottom drag nets and a scallop trawls, right? You do know that all of that equipment will foul on the cables crisscrossing the bottom, right? You do know that as the scallops and clams die off, the fish will leave, right?