Surgically implanting an acoustic transmitter into a juvenile lemon shark (Negaprion brevirostris). © Emily Marcus

Surgically implanting an acoustic transmitter into a juvenile lemon shark (Negaprion brevirostris). © Diego Cardeñosa

Conducting reef surveys in The Bahamas. © Keith Pamper/Shedd Aquarium

Deploying receivers for an acoustic telemetry study. © Kristina Trotta/Shedd Aquarium

Surgically implanting an endangered Nassau grouper (Epinephelus striatus) with an acoustic transmitter. © Lindy Knowles/Shedd Aquarium

Recording shark fishing effort for a series of scientific drumlines. © Field School

Sampling blood from the caudal vein of a juvenile nurse shark (Ginglymostoma cirratum). © Field School

Dr. Heather Marshall (right) discusses fieldwork plans with a colleague.

Dr. Kristine Stump and veterinary collaborator Dr. Jimmy Johnson examine shark blood smear slides. © Field School

Dr. Kristine Stump pipettes shark blood during a research cruise. © Field School

In 2017, Dr. Kristine Stump (left), University of Miami PhD student Rachel Skubel (center) and Dr. Heather Marshall led the first hands-on shark research trip for The Gills Glub, which was co-founded by Dr. Marshall. © Dale Oltmer

At a Gills Club event, Dr. Heather Marshall dissects a dogfish for young participants interested in shark science ©AWSC

Sampling blood from a white shark (Carcharodon carcharius) aboard OCEARCH ©John Chisolm/OCEARCH

Dr. Heather Marshall samples blood from the white shark (Carcharodon carcharius) popularly known as Katherine on board the OCEARCH research vessel © R. Snow/OCEARCH

Dr. Kristine Stump takes a genetic sample from a critically endangered smalltooth sawfish, Pristis pectinata. (All research conducted with the Florida State University Coastal Marine Lab under appropriate research permits.) © Dean Grubbs