Associates & Affiliates

Dr. Paul C. Marsh
Owner and PI

Ph.D. 1979, University of Minnesota

Ecology and Conservation of Southwestern Fishes

Dr. Marsh’s research deals broadly with aquatic ecology in the arid southwest, with emphasis on the community of imperiled native fishes of the region (the suite of indigenous taxa occupying a diversity of aquatic habitats in western United States and Mexico). Laboratory investigations supplement a strong field program examining basic life history characteristics and population and community biology. These pursuits go hand-in-hand with applied management in behalf of target species. Activities are strongly collaborative with academia, state and federal resource agencies, non-governmental organizations, and the private sector.

Beverly Ross
General Manager

B.S. Accountancy, National University

Beverly has worked as a contractor for the Native Fish Lab since 2009 and became a full time employee August of 2014. Her love of the outdoors makes her office work easy to be passionate about. She is also the Treasurer of Marsh Education, and dedicated to get Sharing Tails back in Arizona schools.

Brian Kesner
Senior Project Manager

M.S. 2004, James Cook University, Queensland, Australia

Brian is interested in quantitatively assessing the status and trends of ‘big river’ native fish stocks in the Colorado River. His approach uses standard statistical techniques but he also is developing and applying techniques that are unique to the type of data available and the difficulties associated with data for species that are rare and reintroduced. He also likes to get his feet wet occasionally and assists with monitoring programs throughout the Colorado River basin in Arizona and farther a field. Brian has worked with Dr. Marsh and the Native Fish Lab since 1998.

Carol Pacey
Project Manager

M.S. 1996, Texas A&M University

Ms. Pacey has been with the Native Fish Lab since 1998 and plays multiple roles within the organization. She developed and presents statewide the wildly successful “Sharing Tails” educational program that teaches kindergarten and early elementary school children about native Arizona fishes (see the link above and on our home page). She also is responsible for primary maintenance of the lower Colorado River native fishes PIT tag mark and recapture database and analyzes and interprets field data for reports and publications. When not too busy with other duties she assists with field and laboratory work, makes presentations to professional groups, attends meetings, and interacts with M&As myriad cooperators.

Lara McCall
Fisheries/Aquatic Biologist

B.S. 2011, James Cook University, Queensland, Australia

Lara is the newest member of the team at the Native Fish Lab and has already begun to work on a variety of projects.  She is the lead biologist for non-native fish removal in Bonita Creek and is the co-lead of a bonytail and razorback sucker telemetry study on Reach 4/5 of the Colorado River.  Lara assists with several other field studies and leads construction of our remote PIT scanning antennas.  Prior to her beginnings at M&A, the Australia native double-majored to earn a Bachelor of Science Degree in Zoology and Marine Biology from James Cook University.  She also gained extensive field experience during her time with the Arizona Game and Fish Department.  Lara is a rappelling instructor, certified SCUBA diver, trained in CPR and first-aid, and has her skipper certification through the Royal Yachting Association.


Taylor Haas
Fishery Assistant

B.S. 2014, University of Oklahoma

Taylor grew up in Tyler, Texas, and graduated with a B.S in Zoology from the University of Oklahoma in 2014.  Since then, he has worked in various facets of biological conservation. For two years upon graduation, Taylor worked as an environmental educator in the Rocky Mountains of Colorado and Wyoming.   In the Spring of 2016 the ski boots were replaced by waders as Taylor began working with desert fish conservation for the Bureau of Land Management in Safford, AZ.  Hired by M&A in January of 2017, Taylor performs a plethora of duties, but you can usually find him in the field tracking down the “Big Fishes” of the Colorado River or in the shop building and repairing bioelectronic equipment.

Nichole Carmack
Fishery Assistant

Nichole joined us in October of 2017.