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Seagrasses provide shelters, nurseries, and feeding grounds for thousands of species, including endangered animals such as dugongs, stalked jellyfish and smalltooth sawfish.

It was rescued April 5 off Cudjoe Key, part of an abnormal fish die-off that has killed at least 45 sawfish and other fish species as well.

Then, in January, the mysterious ailment began afflicting smalltooth sawfish, a type of large, prehistoric-looking ray named for the look of its long snout lined with sharp teeth.

“It’s important to note that active rescue and rehabilitation are not always effective in saving stranded animals,” said Adam Brame, sawfish recovery coordinator for NOAA.

To find out, she and colleagues examined 17 genomes from various species of sharks, skates, and sawfish.