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Oil spill may have caused heart problems in commercial fish

GULF OF MEXICO  --  A new study finds that the Gulf of Mexico oil spill may cause heart problems in some commercial fish.

Scientists from the National Oceanic and Atmospheric Administration say they exposed large, deep-water commercial fish such as tuna and Amberjack to oil collected from 2010's BP Oil Spill.
They found fish exposed to low concentrations of oil suffered from abnormal heartbeats.
Those exposed to high concentrations had "severely malformed and malfunctioning hearts."
Researchers warn those heart defects could lead to widespread losses of popular deep-sea fish in the gulf.
BP disputed the findings, saying the oil levels used in the study "were rarely seen in the gulf."