Fishing is for fish, yes. When you're killing whales it's called "whaling", which is illegal. The Japanese, however, call it "research", which is ostensibly what the vessel in question was doing. And while the International Whaling Commission rejected Japans "research proposals", Japan went ahead and issues themselves permits (how magnanimous) to do whatever they pleased.(Because, of course, the law doesn't apply to them... because they said so.) They even went and made a nice little "Institute of Cetacean Research" to formalize the slaughter. How nice of them.