The 23-foot boat’s twin outboard motors leave behind a frothy wake as we cruise out of the sheltered estuary of Hawaii Kai. Rounding the corner out of the bay, the silky morning water turns to small white chops. A lone canoe paddler strokes hunched against wind. Rain clouds blanket the distant Ko’olau mountains in a cold gray mist that has mixed with the ocean spray to coat my glasses and dampen my sweatshirt. My mission today: to catch a fish.