NEW : Large patches of oil offshore . NE : CNN 's Patrick Oppmann and Matt Smith contributed to this report . Nearby Mississippi island also hit . Protective nets cover only part of the Mississippi island . Feds put out spill , Coast Guard Adm. Thad Jones says .
NEW : Large patches of oil offshore . NE : Nearby Mississippi island also hit . Protective nets cover only part of the Mississippi island . Feds put out spill , Coast Guard Adm. Thad Jones says .