A fish surfboard design is a shorter board that is wider and thicker than a standard shortboard. They typically have a flatter rocker and most often come in a twin fin setup, though quad fin fish are becoming popular. There is usually more width towards the front of the board, resulting in a fat nose and gradual taper towards a swallow tail.
Fish are great summer boards and can handle smaller mushy surf much better than a typical shortboard. The flatter rocker allows them to plane at low speeds and float over white water sections, but it is sometimes difficult to avoid pearling on steep drop-ins. The swallow tail combines the tight turns of a pin tail with the stability of a square tail allowing more versatility in the way the board handles.
When you ride a fish you might notice it is always seeking the flat corners of the wave. These boards love to be taken out there so they can make a wide turn back towards the curl. These surfboards are also known for their ability to make very tight pivotal turns which helps when riding in small conditions. If you are having trouble enjoying mushy and meager conditions, then it might be time to add a fish to your quiver.
Check out some more fish surfboards in the SurfScience.com surfboard directory.