The word 'their' is not a noun. The word 'their' is a pronoun, a possessive adjective. The pronoun their takes the place of a plural noun (or two or more nouns) that describes â¦ something as belonging to that noun(s).
This species can reach a length of 11 centimetres (4.3 in) TL. This species is sometimes kept in public aquariums. The sand goby is of a sandy colour, with darker markings on the sides and a creamy-white underside. In the breeding season the male fish has blue spot at the rear of the first dorsal fin, ringed with white.The fish has a slender body, and the head is about a quarter of the total length.his species can reach a length of 11 centimetres (4.3 in) TL. This species is sometimes kept in public aquariums. The sand goby is of a sandy colour, with darker markings on the sides and a creamy-white underside. In the breeding season the male fish has blue spot at the rear of the first dorsal fin, ringed with white.
Sand Sifting Gobies. Gobies are among the most beautiful and entertaining fish found in saltwater aquariums. Some (not all) Gobies process the sand substrate in an aquarium in search for food (algae and detritus).Sand sifting Gobies literally eat sand, removing the algae and detritus, then either spit the sand out of their mouths, or eject it through their gills.Not all Gobies sift sand.and Sifting Gobies. Gobies are among the most beautiful and entertaining fish found in saltwater aquariums. Some (not all) Gobies process the sand substrate in an aquarium in search for food (algae and detritus).