If you're not sure how it got there...
-- If you're in salt water, great. That can help. Taste the water.
-- Inspect it, dry it out completely. Monitor it.
-- If rainwater, simulate rain with a hose around the forward deck and check the area. If yes, narrow down the leak point.
-- I don't know the Sailfish very well, but a common place for cabin leaks is the anchor locker when the locker drains get plugged. Look for cracks in the anchor locker floor/walls.
There's more and I'm sure others can give you other things to look at - especially those with Sailfish's, themselves.