Essential Fish Habitat (EFH) means those waters and substrates necessary to fish for spawning, breeding, feeding or growing to maturity. 'Waters' include aquatic areas and their associated physical, chemical and biological properties. ‘Substrate’ includes sediment underlying the waters. 'Necessary' means the habitat required to support a sustainable fishery and the contributions of ‘managed species' to a healthy ecosystem. ‘Spawning, breeding, feeding, or growing to maturity’ includes all habitat types utilized by a species throughout its life cycle. The descriptions and identification of EFH in Alaska can be found in each of the six Alaska fishery management plans, and more detailed information about EFH can be found in the EFH regulatory guidelines (January 17, 2002; 67 FR 2343).