Databases have powerful search tools that can help you get relevant results. Here are some of the more common tools:
Do refer to the Help pages of individual databases as the symbols may differ.
International Oceanographic Data and Information Exchange (IODE): program of the Intergovernmental Oceanographic Commission (IOC) of UNESCO - enhances marine research, exploitation, and development, by facilitating the exchange of oceanographic data and information.
National Oceanographic Data Center (NODC) of United States Department of Commerce: provides access to the world's most comprehensive sources of marine environmental data and information.
World Data System: was created by the International Council for Science's (ICSU) General Assembly in October 2008. As stated in its Constitution, ICSU World Data System goals are to preserve quality assured scientific data and information, to facilitate open access, and promote the adoption of standards.
OBIS Ocean Biogeographic Information: provides information about the distribution and abundance of living species in the ocean - users can identify biodiversity hotpots and large-scale ecological patterns, analyze dispersion of species over time and space, and plot species' locations in respect to temperature, salinity, and depth.