Fish fins are the most distinctive features of a fish, composed of bony spines protruding from the body with skin covering them and joining them together, either in a webbed fashion, as seen in most bony fish, or similar to a flipper, as seen in sharks. fish can have up to three dorsal fins. The dorsal fins serve to protect the fish against rolling, and assist it in sudden turns and stops. 1  In anglerfish, the anterior of the dorsal fin is modified into an illicium and esca, a biological equivalent to a fishing rod and lure.
emission of electromagnetic radiation during the course of chemical reactions. Such radiation, whether ultraviolet, visible, or infrared, is most commonly generated by oxidation. The radiation can usually be ascribed to the transfer of the oxidation energy to a molecule that is itself not undergoing oxidation.
the reaction in which a metal and oxygen combine to form an oxide. In a more general sense, oxidation of a metal is a reaction in which atoms lose electrons to yield various compounds, such as chlorides and sulfides.With very few exceptions, metals occur naturally in oxidized form and are called ores. Consequently, metallurgical processes involve the reduction of various compounds.he course of the oxidation of a metal is determined by a thermodynamic factorâthe change in free energy during the reactionâand by a kinetic factorâthe reaction rateâthat is largely dependent on both the nature of the oxidation products and the interaction between the products and the metal.