Shoemaker, William S.Galtsoff, Paul S.Gulf of Mexico, its origin, waters, and marine life. Fishery Bulletin of the Fish and Wildlife Service.2010-02-152010-02-151954http://hdl.handle.net/1969.3/20077pgs. 139-141Available knowledge concerning underwater illumination in the Gulf of Mexico is summarized. Secchi disc extinction coefficients are presented in tabular form for various sites throughout Gulf coastal waters.light penetrationunderwater illuminationturbidityChapter