From WD-40 myths + legends page.
Myth: WD-40® contains fish oil.
Fact: Consumers have told us over the years that they have caught some of the biggest fish ever after protecting their fish hooks and lures with WD-40®. We believe this legend came from folks assuming that the product must contain fish oil since it appears to attract fish. Sorry Charlie®, it just ain’t so.
WD-40 Company has taken steps to respect and conserve the environment, and encourages its users to do the same. While WD-40® can be used to help protect fishing equipment from rust and corrosion, WD-40 Company does not recommend using WD-40® to attract fish
“Would it save you a lot of time if I just gave up and went mad now?” Douglas Adams