A goby is a small fish belonging to the family Gobiidae, which includes over 2,000 species. Gobies are typically found in both freshwater and marine environments, often inhabiting sandy or rocky substrates. They are known for their elongated bodies and fused pelvic fins, which form a disc-like structure that helps them cling to surfaces. These fish play an important role in their ecosystems, serving as prey for larger fish and contributing to the food web. Some species of gobies have a symbiotic relationship with shrimp, sharing burrows for protection and habitat. Their diverse colors and patterns make them popular among aquarium enthusiasts.