Animal Welfare

SRC is deeply committed to protecting the health and safety of the people and animals involved in its research and outreach activities. All staff, students, interns, and educational participants are trained to stay safe on the boat based on their specific roles. Our staff and interns train extensively in animal handling and boat safety practices. We are always brainstorming new ways to improve our work together in the field and decrease the stress sharks experience when captured as part of scientific research.

IACUC-Approved

The University of Miami ensures that all faculty and staff comply with federal and state guidelines concerning the use of animals in research and teaching through the Institutional Animal Care & Use Committee (IACUC). Working in conjunction with the Division of Veterinary Resources (DVR), the IACUC is accredited by the Association for Assessment and Accreditation of Laboratory Animal Care (AAALAC) and meets monthly to review faculty research protocols. IACUC panel members include participants from all University campuses and the general community.

IACUC’s mission is to:

Review and approve animal use protocols;
Ensure that investigators and staff are properly trained;
Ensure that research and teaching activities conform to best practices as defined by The Guide For the Care and Use of Laboratory Animals;
Inspect animal care and use facilities to ensure compliance with federal regulations and policies;
Review the animal care and use program semiannually; and
Investigate concerns raised by faculty and staff regarding the humane care and use of lab animals.

To contact IACUC at the University of Miami, e-mail iacucsupport@med.miami.edu or call 305.243.2311.

Special Considerations and Precautions

Drumlines and Circle Hooks

We use fishing units called drumlines to reduce shark capture stress and promote their well-being. Each drumline is affixed with a long fishing line, composed of a series of swivels, to allow hooked sharks to swim with 360 degrees’ range of motion. This allows the shark to continue swimming in large circles for ram ventilation (many shark species need to continuously swim to provide oxygenated water flow over their gills).

SRC Tagging Trip with Cushman April 14, 2022

Water Pump

When a shark is brought aboard for tagging and sampling, a water pump is placed in its mouth that pushes water over its gills. This allows for continued breathing during the work-up and reduced stress levels.

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Satellite Tags

Satellite tags help us gather invaluable data without compromising shark health. The satellite tags are carefully attached to the dorsal fins, which doesn’t hurt the shark. These tags are designed to eventually fall off the fin. We’ve recaptured satellite tagged sharks after months at liberty, and their fins are undamaged.

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Blood Sample

We collect a small blood sample from sharks which can reveal a wealth of information. These samples help us assess stress levels, pregnancy hormones, immune status, energy stores, and short-term dietary patterns. Similar to having your blood drawn at the doctor’s office, a small needle is inserted into the caudal vein of the shark to collect a few milliliters of blood in a matter of seconds.

Fin clip

Part of our workup includes sampling a small piece of dorsal fin tissue. This doesn’t hurt the shark, as their fin is composed mainly of cartilage. Additionally, this small piece of tissue can regenerate over time. We use these fin clips as part of a larger study investigating population genetics of wild sharks and to explore long-term dietary trends.

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Ultrasound

Female sharks over size at maturity are quickly and painlessly ultrasounded to assess reproductive status. This can help tie our other data, including location, hormone values, and information about diet, to reproductively important events.

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Rapid Processing Time

To minimize stress to the sharks, our team works like a race car pit crew to quickly tag and sample the shark before releasing it back into the ocean. We keep track of how long we’ve been working up a shark and prioritize returning the animal to the water quickly.

Monitoring Release Condition

We monitor the condition of the shark on release to help gauge the efficacy of our stress-reducing efforts. Taking underwater photo and video allows for later scientific review.

Muscle biopsy

part of our workup includes taking a small muscle biopsy from each shark. A biopsy punch is used to collect a small amount of white muscle. These samples provide a wealth of information about toxin levels, immune state, diet, and nutritional condition of sharks.

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Great Hammerheads

One of the species we work with is the great hammerhead shark, and previous research has demonstrated that this species is vulnerable to capture stress. When working with hammerheads, we have a modified, faster work-up procedure to ensure their rapid release.

Acoustic tags

We deploy acoustic tags on juveniles of multiple species. These tags emit a unique high frequency signal (that cannot be heard by the shark) which is recorded on our underwater hydrophones. These tags are especially helpful for collecting long-term data as animals grow (they can last for up to ten years) and for providing fine-scale habitat use data within Biscayne Bay.

FAQs

Does your research harm the sharks?

Every aspect of our data gathering process is designed to minimize harm to our research subjects. We use special fishing and tagging gear intended to reduce stress, shorten handling time and promote shark safety.

Drumlines

The Shark Research & Conservation Program uses special fishing units called drumlines (composed of a single weight and attached hook & line) that promotes shark vitality when fishing for sharks. The gear permits species which are ram ventilaters (need to keep moving to breathe) to swim in big circles around the weight when caught. The ability to swim relatively freely also minimizes stress-related C02 and lactic acid buildup in shark muscle. This gear promotes shark survival.

Circle hooks

Circle hooks can help reduce negative outcomes for captured sharks over other commonly used hooks, most notably J hooks. Circle hooks are designed to catch in the shark’s jaw, instead of catching on the shark’s stomach or gills, which can otherwise cause serious injury. The hooks can also easily be removed from the jaw and leave a very superficial wound that heals very quickly. Circle hooks also help us selectively target sharks, reducing unwanted bycatch of other species. We recommend circle hooks not only for research-related capture, but for recreational fishermen practicing catch and release fishing who want to increase the likelihood of release their catches in good condition.

Workup Process

When a caught shark is brought onto a specialized, partly-submerged, platform on the back of our research vessel, a saltwater pump is immediately placed in the sharks’ mouth. This allows highly oxygenated water to flow over its gills throughout the shark’s brief ”check-up.” During this workup, sharks have a small muscle biopsy taken (recaptured sharks demonstrate that the biopsy site is completely healed within just a few weeks), are tagged with a spaghetti tag in their dorsal fin (where they have no nerve endings and no blood vessels), have blood drawn, are measured, have a small clip of their fin cartilage taken, and are released.

The traditional method for getting the type of data we collect was to kill the animals. Although capture may still be a relatively stressful process for sharks, our work focuses on minimizing shark stress to the greatest extent possible and promoting shark vitality and survival.

Do sharks feel pain when you work them up?

Sharks have significantly fewer nerve endings than humans do. Humans have developed tremendously complex nervous systems with many millions of nerves as part of the process of evolution, these nerves “teach” us—through pain—what we should and shouldn’t do (don’t touch a hot stove). However, this level of sensitivity to temperature, pressure or pain has not been necessary for sharks. The nerves that report tissue damage and lead us to feel “pain” are neurons called “nociceptors” which account for approximately 50 percent of all human neurons, but only 13 to 38 percent of shark neurons and less than 1 percent of ray neurons. Sharks have many fewer nerves than we do, and devote a smaller percentage of those they do have to feeling pain. Therefore, although we don’t know exactly how it feels to a shark when we tag it, we can say for certain that they have neither the nerve endings nor the neurological apparatus to experience pain the way a human would.

For more information on sharks and pain, please click HERE.

Do your tags cause fin damage?

All tags are not permanent. They fall off over time and the application point heals back quickly. Some of our satellite tags are temporarily attached to the shark’s dorsal fin. However, sharks have no blood or nerve supply to their fins. We’ve also recaptured satellite tagged sharks after months at liberty, and their fins appeared undamaged. The potential effects on the sharks are minimal considering the research and education it provides, which will help protect these threatened species. For more information, please read our paper on satellite tags, which also discuss the potential for negative impacts on sharks.

For a full description of the potential impacts of satellite tagging, visit Dr. Hammerschlag’s blog on National Geographic.

How does all this sampling and tagging actually help sharks?

In order to create the most effective policies to protect shark populations, scientists need to study the biology, ecology, and life history of these species. Sharks spend so much of their lives below the surface, away from humans, that very little is currently known about them. Dr. Hammerschlag and his team have developed some of the most cutting-edge and efficient methodologies for studying sharks, while still ensuring healthy release conditions. Explore our biggest discoveries in the scientific publications and surrounding media coverage.

How long can the shark stay out of the water?

We don’t fully remove sharks from the water. We use a specially designed platform that is partially submerged to secure the sharks. During their “check-ups”, we place a water pump in the shark’s mouth to pump oxygenated saltwater over their gills to promote vitality. The platform allows us to sample and tag the shark much quicker than if it were thrashing around in the water. Although we aim to release the sharks as quickly as possible, our check-ups usually last about five minutes on average before releasing the sharks.