CTV News | Fish compromised after exposure to crude oil, new research shows CTV News ANCHORAGE, Alaska -- New federal research shows that embryonic salmon and herring exposed to very low levels of crude oil can develop heart defects that hurt their chances for survival. The National Oceanic and Atmospheric Administration scientists say ... Delayed effects of oil spill compromise long-term fish survival: Low-level oil ... Delayed effects of oil spill compromise long-term fish survival |