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A smalltooth sawfish rescued in early April has died despite rehabilitation efforts.

An endangered sawfish rescued last month in the Florida Keys after it was spotted acting erratically and swimming in circles has died as wildlife officials continue to search for what is causing fish to become distressed. The Mote Marine Laboratory & Aquarium in Sarasota said in a statement that the 11-foot (3.3-meter) smalltooth sawfish died Thursday at the facility, where it had been undergoing treatment. 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.

Wildlife officials euthanized a distressed smalltooth sawfish that was rescued from Cudjoe Bay in the Florida Keys where it was swimming in circles.

An 11-foot long smalltooth sawfish has had quite the journey. The male was rescued from Cudjoe Bay in the Florida Keys, found in distress and swimming in circles on April 5. For the last week, Mote Marine Laboratory provided round-the-clock observation at an interim holding tank at Mote’s Lower Keys facility.

Since February, almost 40 of the endangered fish have been found dead in the Keys.