2006 Annual Report 4d.Progress report. This report documents research conducted under a specific cooperative agreement between ARS and the University of Southern Mississippi (6225-32000-004-02S). Additional details of research can be found in the report for the in-house associated Project 6225-32000-004-00D, Evaluation of Compounds and Strategies for Controlling Aquatic Animal Disease. Progress on this project was slowed by resource limitations because the Gulf Coast Research Laboratory, Ocean Springs, MS, involved with the identification work was greatly disrupted by Hurricane Katrina. This project was extended one year to allow completion of planned work. There were 433 samples from 9 bird species collected by employees at the HKD Stuttgart National Aquaculture Research Center from 2001 to 2005 and sent to the Gulf Coast Research Laboratory for processing, and some preliminary identification from selected samples were made. A mushroom-headed worm found in great egrets and snowy egrets is a Cotylurus-like strigiid trematode. Mature Posthodiplostomum-like trematodes and immature diplostomatid trematodes (possibly Bolbophorus sp.) were found in snowy egrets. Very tiny, flask-shaped trematodes identified as Phagicola sp. were found in green herons, cormorants, great blue herons, and great egrets. Immature diplostomatid trematodes (possibly Bolbophorus sp.) occur in snowy egrets, great blue herons and green herons. None of these trematodes found in the above-mentioned birds appear to be an economic threat to the fish industry.