Don’t be caught sleeping: proactive conservation research for Pacific sleeper sharks

  • Sharks
Years funded
  • 2021
  • Active
Project types
  • Conservation
  • Research

Mike’s idea for satellite tagging Pacific sleeper sharks came about from part of his work in a larger project trying to find better ways to harvest local swordfish around San Diego, California. When sleeper sharks started appearing regularly as bycatch on the swordfish fishery-gear, Mike wanted to tag them to understand how they use their deep ocean home – and how we can avoid or reduce future entanglements. By collecting information on light levels, depth, water temperature and animal movement patterns, this project can bring to the surface much-needed life history information to aid the conservation of Pacific sleeper sharks.

Don’t be caught sleeping: proactive conservation research for Pacific sleeper sharks

Michael Wang

Project leader
About the project leader

Although born in Texas, I’ve always felt more at home near the coast. Since we moved to San Diego when I was two, my free time has always been spent in the ocean – surfing, fishing, diving and studying. After graduating from the University of California, Santa Cruz, with a degree in marine biology and exhausting my remaining funds on a cross-country bicycle tour, I hunkered down for six long months working aboard commercial fishing vessels as a fishery observer in Alaska. Although the work was challenging, it gave me a great ground-level view of the fishing...

Project details

Don’t be caught sleeping: proactive conservation research for Pacific sleeper sharks

Key objective

The key objective of this work is to capture, tag, and release Pacific Sleeper Sharks to study their movements, behaviors, and habitat preferences off Southern California.  The information produced from this study will be used to advance scientific knowledge and efforts to create sustainable fishing gear alternatives

Why is this important

The Pacific Sleeper Shark is a large deepwater shark that is slow to mature and reproduce.  These factors can cause sleeper shark populations to be particularly vulnerable to the effects of being caught and released on fishing gear.  This project is important because it documents these effects on sleeper sharks caught by and experimental fishing gear and can lead to recommendations for gear medications and management actions to advance shark conservation.


Despite its extensive range, the Pacific Sleeper Shark remains very poorly studied, as its elusive nature and deepwater habitat typically preclude easy access to observations and specimens.  In fact, virtually no published studies describing sleeper shark biology exist for the proposed study region.  This dearth of information can be problematic when designing fishing gear that is intended to minimize interactions with non-target catch such as sleeper sharks.  Deep Set Buoy Gear is an experimental fishing gear configuration that targets swordfish in the deep ocean, but has also caught a number of these sharks.  To determine the likelihood of these interactions and develop strategies to avoid them in the future, it is first important to understand the movement behaviors and habitat preferences of sleeper sharks in the study region.  Past studies in as disparate regions as Alaska and the Arctic have described distinct movement patterns of sharks as they swim up and down throughout the water in search of food.  It is important to verify if these same movements can be observed for sharks in the Southern California region, or if they exhibit different foraging behaviors.  This information will guide scientists, managers, and fishers to make the most informed decisions possible when faced with questions ranging from policy to gear design to fishing strategies.

Aims & objectives
  • The successful completion of this project relies not only on gathering novel and valuable information on Pacific Sleeper Sharks caught using Deep Set Buoy Gear, but also the effective communication of results and implementation of real changes gleaned from project findings.
  • The main activity in this project aims to tag and release up to 5 Pacific Sleeper Sharks and document the biological and environmental conditions under which they are caught.
  • The next objective involves the study of this tag data to see what conclusions can be drawn from shark movement behaviours and what next steps can be identified to promote sleeper shark conservation and research.
  • The final objective of the project is the communication of study results to the scientific community and public, through outreach channels facilitated by the Save Our Seas Foundation, PIER, the Oceanside Sea Center, and a peer-reviewed article produced as part of a master’s thesis.