"The Japanese government ignores all diplomatic lobbying to stop this butchery, even though polls suggest that even the majority of Japanese people are against it.
"If we register our outrage in way that threatens their economy though, we think that may have more impact."
Sea Life Centres have begun regular broadcasting of the famous and haunting 'song of the humpbacked whale' over its aquarium sound systems to help rally support for its boycott.
The Centres' own gift shops are removing all Japanese goods from their shelves.
"When you consider the number of Japanese electrical products, mobile phones, computer games and other such items that help fill Christmas stockings, this protest could really make in impact," said Rob.
Primary schools are also being urged to make the painting of 'Stop Killing Whales' posters a special art assignment.
"Whichever school pupil paints the best poster will win a free Sea Life visit for his or her who school class," said Rob, "and we'll make a huge display of all the best entries."
The Sea Life network includes attractions in Finland, Germany, Holland, Belgium, France, Spain and Ireland as well as the UK.
It has an impressive track-record of championing marine life causes, having petitioned the EU over turtle conservation, shark-finning and overfishing.
"This latest campaign is different in that there is no compelling scientific case to suggest that whale populations will be endangered by this hunt," said Rob.
"My colleagues and I feel no less strongly about it, though, as we all care passionately about whales and share a total abhorrence of this slaughter."