There have been more than 50 sightings of sick or dead sawfish in the Lower Keys since November, according to the Florida Wildlife Commission. Despite ongoing efforts, researchers have yet to determine the cause but are actively testing the animals and collecting samples. #FloridaKeys #sawfish #research Start your day with "Morning in America," NewsNation's live three-hour national morning newscast hosted by Markie Martin. Weekdays starting at 6a/5C. #MorningInAmerica NewsNation is your source for fact-based, unbiased news for all America. More from NewsNation: newsnationnow.com Get our app: trib.al/TBXgYpp Find us on cable: trib.al/YDOpGyG How to watch on TV or streaming: trib.al/Vu0Ikij