Something odd is lurking in the water.The Florida Fish and Wildlife Conservation Commission said they have detected abnormalities in mullet, and it is raising concerns.An investigation is underway, and samples of water have been taken."The first thought that came to my mind was they kind of look like zombie fish," said Joe Cruz, who gives river cruises at Blue Spring, and every day he's there, he tries to swim and take underwater pictures and video.What he recently saw were very sick looking mullet in the spring run, and it really alarmed him."They had growths on the sides of them. Some of their scales were missing, they had really cloudy eyes, they just looked very unhealthy, very sickly," Cruz said.Cruz's mullet are not the first diseased looking fish reported to FWC. WESH 2 News obtained pictures of mullet from other springs connected to the St. Johns River, some with missing scales, others with ulcers and lesions.Fish kills have also been reported. FWC took water and fish samples at Blue Spring, and before that, in other locations.A spokesman wrote, "Water samples collected from Lake George, Silver Glen Springs and Salt Springs showed the presence of blue-green algae blooms in the area. Fish samples were collected as well. Necropsy results are pending and will take a few more weeks before results are finalized."Cruz doesn't claim to be a marine life or environmental expert, but he said he believes something is wrong."If the fish are kind of like a canary in a coal mine for problems that are going on with our water, then that's a very scary thing, as we're all connected by our water in Central Florida," he said.So far, there have been no reports of other species of fish impacted, including Blue Spring's famous winter residents, the manatees.