Aquaculture 2022

February 28 - March 4, 2022

San Diego, California

SCALING UP RESTORATIVE AQUACULTURE OF ENDANGERED WHITE ABALONE Haliotis sorenseni

 

Sadie L. Small* & Kristin M. Aquilino

 

University of California Davis Bodega Marine Laboratory

2099 Westshore Road

Bodega Bay, California 94923

slsmall@ucdavis.edu

 



White abalone (Haliotis sorenseni ) are an economically, culturally, and ecologically important species that was once abundant along the coast of southern California and Baja California, Mexico. Commercial overfishing severely reduced populations in the late 1900s, leading to fishery closure in 1996 and listing under the Endangered Species Act in 2001. It is estimated that there are fewer than 4100 white abalone in the wild, giving great urgency to recovery efforts. Restorative aquaculture and outplanting were identified as the primary action for species recovery. With early aquaculture setbacks due to disease and other challenges largely overcome, aquaculture efforts now focus on ways to scale up production in the face of limited genetic diversity among broodstock , limited gamete production, high post-settlement mortality, and climate change. To address the unique challenges of spawning, rearing, and outplanting white abalone, captive production protocols incorporate results of research on reproductive conditioning, settlement, disease, optimal diets, and climate change, including multi-stressor experiments that examine potential interactions among these factors. We hope this work will accelerate production from the approximately 25,000 one-year-old white abalone currently produced annually to the approximately 100,000 white abalone that likely need to be outplanted annually to restore the species. The work we present is led by the University of California, Davis, Bodega Marine Laboratory (UCD-BML) in partnership with state and federal agencies, universities, commercial aquaculture farms, and non-profit organizations.