Why are star fish called fish if they are not fish?

Sea stars, commonly called, starfish, are not fish. ... Sea stars are related to sand dollars, sea urchins, and sea cucumbers, all of which are echinoderms, meaning that they have five-point radial symmetry. However, this does ... If one of these arms is lost, a sea star has the amazingly ability to regenerate it. read more

For e.g. all the types of molluscs that are “fished” out from sea comes uner what is called “molluscan fishery”. Similarly seaweed that are harvested comes under the parlance “sea weeds fishery”. Both of the above are not fish, but still as they are minor constituents “fished” (harvested) from sea, they are given that name. read more

Sea stars, commonly called, "starfish," are not fish. There are approximately 2,000 species of sea star, all of which live in marine waters. Sea stars live underwater, but that is where their resemblance to fish ends. read more