Sunfish have a bizarre appearance. The best way to describe them is with the term 'swimming head'. Every once in awhile, a sunfish is caught in the North Sea, or one is washed ashore. It is usually a small, young specimen weighing around 50 kilograms. Sunfish have a relatively long life expectancy and keep growing their entire life. There have been reports of sunfish 4 meters long and 2300 kilograms. Sunfish have two world records. They are the heaviest known bony fish and they lay the most eggs. They are even mentioned in the Guinness Book of World Records.