Jack Friedetzky, 11, center, and his brother Nick, snorkel in the water south of Doctors Pass on Monday during their summer visit to Naples from Germany. The brothers were able to see an unusual arrival of offshore fish, some of them dead, that littered the shoreline Monday in North Naples. The Florida Fish and Wildlife Conservation Commission is testing water samples and shark tissue to determine the cause of the dark water and fish kill. Scientists suspect low-dissolved oxygen, possibly as a result of a dying algae bloom, are killing the fish. The health department has not advised swimmers to stay out of the water. Lexey Swall/Staff

Photo by LEXEY SWALL

Jack Friedetzky, 11, center, and his brother Nick, snorkel in the water south of Doctors Pass on Monday during their summer visit to Naples from Germany. The brothers were able to see an unusual arrival of offshore fish, some of them dead, that littered the shoreline Monday in North Naples. The Florida Fish and Wildlife Conservation Commission is testing water samples and shark tissue to determine the cause of the dark water and fish kill. Scientists suspect low-dissolved oxygen, possibly as a result of a dying algae bloom, are killing the fish. The health department has not advised swimmers to stay out of the water. Lexey Swall/Staff

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