Largest species of goby can grow to the length of 12 inches. Most species are usually less than 4 inches long. Goby can be transparent or brightly colored, covered with various blotches and bands. Goby has elongated body that ends with rounded tail. Eyes can be large or nearly invisible in some species. Goby is a carnivore (meat-eater). It eats insects, larva, eggs, mussels and plankton. Neon goby collects and eats parasites from the body of large fish.