Tumors in Catfish from the South River, Anne Arundel County, MD
Alfred E. Pinkney
The brown bullhead (Ameiurus
nebulosus) is a species of catfish that
lives in rivers, lakes, and ponds. In tidal
waters, they can tolerate salinities up
to about 15 parts per thousand (about
half that of the ocean). Bullheads feed
on worms, insect larvae, and small
crustaceans living in the mud. These
fish often develop liver and skin tumors
after exposure to cancer-causing
chemicals that accumulate in sediments.
They also have a small home range.
Thus, bullhead tumor surveys have
been used as an indicator for measuring
habitat quality in the Great Lakes and
Chesapeake Bay watersheds.
U.S. Fish and Wildlife Service
http://www.fws.gov/chesapeakebay/pdf/SouthRiverFS.pdf, 150 KB
U.S. Fish and Wildlife Service - Chesapeake Bay Field Office