Because there's no sharks to report on.
The flooding is from Lake Pontchartrain - which is fresh water. Sharks are salt water critters.
Lake Ponch is connected to the Gulf via a channel. I am not from that area, but I would assume, as a result, the water is at least brackish, and there are sharks that can survive in that kind of water.
Actually- the lake is the 2nd largest salt-water lake in the country.
Not true. Lake Pontchartrain is not a fresh water lake, it is connected to the Gulf and is probably brackish, there could be sharks there. Even if sharks are not normally in the lake they could have been forced there by the storm surge. A shark was reported swimming down Canal St. but that could have been a rumor or outright lie.