Eleven species of mammals and sea creatures, says the council, have still not recovered, including the Pacific herring, which has returned only in small numbers.

FORBES: Magazine Article

One of the ongoing problems that will be discussed at the conference by Kevin Stokesbury of the University of Alaska, Fairbanks, is how a viral infection triggered by exposure to the oil has decimated Prince William Sound's stocks of Pacific herring.

CNN: Conference to assess Exxon Valdez oil spill