Folks,
This article describes the effects from the Exon Valdez many years after the original spill.
If one can believe the science, small amounts are quite injurious to the fish's heart and may cause deformities.
http://www.npr.org/2014/03/22/292131...nt-for-science
This might explain the deformities found in the Athabaska and Bow Rivers.
Don