I was lucky enough to go twice last year (May and Oct.). Everytime I was down in Lahina I saw people walking away from the boats with their fresh catch fillet out for them. Saw a lot of nice fish down there.. Anyway it must depend on what boat you are on what you get to keep. But, yes you can keep some of your catch. Here is a great link with a ton of INFO

Here is a nice guide to use for seasons also.

_________________________
This nation will remain the land of the free only so long as it is the home of the brave.
—Elmer Davis