Here is a petition I just found that was filed on 1/27/2010 with the NOAA Fisheries Services. Has to do Chinook Salmon Spring Run on the Klamath River and listing them under the Endangered Species Act (ESA).
READ PAGE 38 AS TO WHAT IS BEING SAID ABOUT SUCTION DREDGING.
http://www.biologicaldiversity.org/publications/petitions/listing/pdfs/Klamath_Chinook_Petition.pdf