Sea fish a life in the water

All fish swim, however not in the same way. Stayers such as mackerel, herring and sprat, can swim fast for a fairly long time. Cod, haddock, sole and plaice are sprinters: they swim quickly for a short period of time. This difference is easy to see in the muscles. The muscles of stayers are red, a sign of good circulation with lots of oxygen. Sprinters have white muscles and are quickly exhausted.