HAEMULIDAE
Haemulidae
The grunts are a family, Haemulidae, of fishes in the order Perciformes. They are numerous and widespread, with about 150 species in 19 genera, found in tropical fresh, brackish and salt waters around the world. They are bottom-feeding predators, and named for their ability to produce sound by grinding their teeth. They also engage in mutualistic relationship with cleaner gobies of genus Elacatinus, allowing them to feed off of ectoparasites on their bodies.The above text is a snippet from Wikipedia: Haemulidae
and as such is available under the Creative Commons Attribution/Share-Alike License.