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.
Gobies are relatively small fish, usually reaching three inches in captivity. Goby fish species adjust well to aquarium life. A well-sealed lid is a requirement for keeping gobies, as they will jump out of an open aquarium. Plenty of rockwork and the proper substrate of coral sand should be provided to enable burrowing or sand sifting Gobies the proper environment.