Not the biggest but the one you will never forget. The one that came to mind when you read the title.
Mine was when I was a kid fishing with my dad off the cap cod cannel. Three huge fins surfaced in front of us, and my dad casted a bunker rig right in front of them with a old surf casting rod. One fin dived for the bait and then jumped five or six times before that fish, god knows what it was, spooled my dad. I was eight or nine but remember that like it was yesterday. My six year old daughters 5 lb small mouth is a close second last summer, 20 minute fight. Neither, I hooked but my best fish. By far.