- published: 08 Jul 2014
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The skin of most fishes are covered with scales. Scales vary enormously in size, shape, structure, and extent, ranging from strong and rigid armour plates in fishes such as shrimpfishes and boxfishes, to microscopic or absent in fishes such as eels and anglerfishes. The morphology of a scale can be used to identify the species of fish it came from.
Cartilaginous fishes (sharks and rays) are covered with placoid scales. Most bony fishes are covered with the cycloid scales of salmon and carp, or the ctenoid scales of perch, or the ganoid scales of sturgeons and gars. Some species are covered instead by scutes, and others have no outer covering on the skin.
Fish scales are part of the fish's integumentary system, and are produced from the mesoderm layer of the dermis, which distinguishes them from reptile scales. The same genes involved in tooth and hair development in mammals are also involved in scale development. The placoid scales of cartilaginous fishes are also called dermal denticles and are structurally homologous with vertebrate teeth. It has been suggested that the scales of bony fishes are similar in structure to teeth, but they probably originate from different tissue. Most fish are also covered in a protective layer of slime (mucus).
David Darnell Brown (born March 15, 1981), also known as Young Buck, is an American rapper, actor, entrepreneur, and producer. Buck is a former member of the hip hop group UTP Playas. As a music executive, he is president of his own record label, Ca$hville Records, and is currently a member of the hip hop group G-Unit. After being dismissed from the group back in 2008, Buck reunited with his former group members on June 1, 2014 at Hot 97's Summer Jam event.
Around the age of twelve, Brown began rapping because he was inspired by a Miami friend named Clay Cole. Jealous of his friend's talent, he wanted to beat him no matter what he had to give up. At the same time Clay Cole moved to Tallahassee in Florida, Brown began recording in a real studio. Shortly thereafter, he was given an opportunity to perform for Brian "Baby" Williams, co-founder of Cash Money Records. After several years on and off of Cash Money Records, Brown and fellow rapper Juvenile decided to leave the label for good in 2000 and go to UTP Records, where Brown stayed until 2003. One of his early appearances was on the song "Memphis," where he was featured along with Three 6 Mafia, Project Pat, and other southern rappers. His deal with UTP later led to a meeting with New York rapper 50 Cent, who later signed him to G-Unit Records, under Interscope Records.