Oceanography: Since 1992 we have been gathering oceanographic data from a variety of sources to better understand the fjord estuarine processes and the distributions and abundance of marine species. We have been obtaining CTD profiles of the water column as part of multiple diverse projects (e.g. during long-line sets and SCUBA dive transects) as well as at regular time intervals from a series of 21 permanent sampling locations along the entire length of the Bay. Information gathered during all of these CTD casts includes salinity, temperature, light penetration, and the amount of phytoplankton (chlorophyll a) throughout the water column. We have also monitored surface and bottom temperatures continuously at several selected sites. In 1996 we began to download daily AVHRR satellite data on surface water temperature throughout the Park and neighboring areas. These oceanographic data help describe the physical environment in which the marine species we are studying live; this long-term data set is also valuable for the information it contains about fjord estuarine circulation processes, and about variation in Glacier Bay both in space and time.