An annual search for a tiny endangered and contentious fish in the sprawling California Delta has once again come up empty.

The state’s annual Fall Midwater Trawl Survey found no delta smelt in September’s sampling of the critical waterway. The last time the rare fish turned up in a survey was in October 2017 when just two were found. Hoping to reverse the recent trend, the Westlands Water District and the California Department of Water Resources announced the completion of a Delta habitat restoration project on Wednesday.