I'm with Boothy. I don't know what it's called these days, but when I was prepping Pearl for paint I got a tube of Red Putty from the paint supply place. It looks like red primer but is the consistency of toothpaste and is used for deep scratches and gouges. Sand the area out to 2"-3" radius around the gouge and then apply the putty with a plastic spreader (looks like a plastic spatula). Like Spackel, it might take a couple or more light applications to get it to fill smoothly, once sanded with a large sanding block. Let it dry for a day or so between applications to make sure it cures through. It looks like a deep-ish gouge - later, lighter coats will dry quickly.
I would not attempt to match the color and paint it myself. Instead, I would take it to a locally recommended place that does good paint work and let them color-match it with a computer scanner. The place that painted Pearl (3-part micro-metallic with a top coat) said that they could match my paint perfectly with their machine. Even then, ask around if any place is better than others in your area with metallic paint, if that's what you have. Even with a computer formulation, really matching it can be a PITA.
And don't forget! In your area, that best-of-breed paint shop might be one that does boats for a living!