Fishkill mystery: Something is killing endangered sawfish in the Florida Keys

There’s something deadly in the waters of the Florida Keys, and no one knows what it is. It’s not harmful to humans, but something is killing the critically endangered sawfish. In the last six weeks, 20 sawfish have floated up dead. NBC 6 on Instagram: @NBC6 | NBC 6 on Facebook: NBC 6 on TikTok: @NBCsouthflorida | @nbcsouthflorida Get breaking news, First Alert weather updates, plus live cameras from NBC 6 South Florida. NBC 6/WTVJ was Florida’s first television station and has been covering news in South Florida for over 70 years.