Eugenie Clark, the researcher the press called the Shark Lady, spent six decades working on live sharks and became the example that made a career in shark biology imaginable for women who had never seen one.
She finished her doctorate in 1950, founded her own marine laboratory in Florida in 1955, and published the trials that showed sharks can learn and remember. The trail part is not a figure of speech: she ran the lab, chose the students, wrote the popular books that reached girls who were never going to meet a scientist, and kept diving until the year she died at 92.
- Lived1922 – 2015
- Laboratory founded1955, five years after her PhD
- Still diving at92
On this page
What she was up against
To see why the trail needed blazing, look at the dates. Clark took her zoology degree at Hunter College in 1942 and her doctorate at New York University in 1950. Through that decade, American graduate departments in the sciences admitted women in small numbers and employed them in smaller ones, field stations frequently had no accommodation for them, and research vessels often had a policy, formal or otherwise, against carrying them at all. A woman who wanted to study animals in the sea was expected to study them from a bench.
Her background added a second obstacle. Clark's mother was Japanese, and the years in which she was building a research record ran straight through a war with Japan and its aftermath, a period in which Japanese-American families were interned and Japanese-American careers were not encouraged. She wrote later about applications that went nowhere for reasons nobody put in writing.
What she did with that was refuse the bench. She learned to dive, she collected her own specimens, she published her own results, and within five years of her doctorate she was directing a laboratory of her own. The route she took is the one described in more detail on the Eugenie Clark profile, and alongside the other people gathered on the shark experts page it shows how narrow the entry point into this subject used to be.
The work that made the case
Being first is not enough on its own; the results had to matter, and hers did. The best known came out of the pens at the Cape Haze Marine Laboratory, which she set up on Florida's Gulf coast in 1955 with funding from a local family. Clark conditioned lemon sharks to work a submerged target for food, then closed the experiment down for ten weeks and started it again. The animals performed the sequence without retraining. Published in 1959, the finding cut directly against the view that a shark was a bundle of feeding reflexes, and it is still cited when anyone argues about shark cognition.
In the Red Sea she followed up a report from Israeli divers that sharks would not take a particular flatfish, the Moses sole. Her tests showed sharks releasing the fish within seconds of closing on it, and the compound responsible was later isolated and named pardaxin. Off the Yucatán she dived the caves where local fishermen had found requiem sharks lying motionless on the bottom, animals of a kind widely assumed to need continuous swimming.
She also ran the institutional side, which is the part that produces successors rather than papers. The Cape Haze lab became the Mote Marine Laboratory in 1967 and is now a research institution with its own aquarium. From 1968 she taught zoology at the University of Maryland, supervising graduate students for twenty-four years. A number of fish carry her name, including the deep-water Genie's dogfish, described in 2018, three years after her death.
Three stories about her that do not survive checking
Her reputation has picked up embellishments, and they do her no favours, because the real record is strong enough without them.
The first is that she discovered the Moses sole as well as its effect on sharks. She did not. Pardachirus marmoratus was described scientifically in the early nineteenth century and was familiar to everyone fishing the Red Sea. What Clark established was what its secretion does, which is the harder and more interesting result.
The second is that she proved sharks do not need to keep swimming to breathe. That overstates it. Plenty of sharks were already known to rest on the bottom and move water over the gills by pumping it with the mouth and spiracles, which is how a nurse shark spends its day, and the mechanics are set out in how sharks breathe. What the Mexican caves showed was that species assumed to be obligate swimmers could hold station in particular conditions, which narrowed a rule rather than demolishing it.
The third is that in 1968 she joined the maiden voyage of Cousteau's Calypso. The dates make that impossible: Jacques-Yves Cousteau had converted the vessel and been working from it since the start of the 1950s. She was a guest on filming expeditions with his crew, which is a perfectly good line in a biography and does not need improving.
The scientists who came after
The clearest measure of the trail is how ordinary it now is for a shark paper to have a woman's name on it. Three examples give a sense of the range, and they were chosen because their published work is easy to follow rather than because the field stops at three.
Shannon Corrigan works in molecular systematics — the branch that uses DNA to work out which sharks are related to which. Her doctoral research at Macquarie University used mitochondrial and nuclear markers to untangle the wobbegong sharks, a group whose species boundaries had been argued over for decades, and she went on to contribute to the large collaborative effort to build a genetic tree for all sharks and rays. It is laboratory work, and it has rewritten a good deal of the species list.
Michelle Jewell is an ecologist who studies predator and prey behaviour and writes about it for general readers, including a widely shared essay on how far science still has to go on the treatment of women in it. Lindsay Graff has worked on white sharks with the Atlantic White Shark Conservancy and ran a field programme in Fiji in which students dived the Shark Reef Marine Reserve every morning — a site known for its bull sharks — and spent the afternoons on anatomy, threats and current research.
The Gills Club, run by the Atlantic White Shark Conservancy, exists to connect girls directly with women doing this work, on the straightforward theory that the example is what makes the career visible. It is the same mechanism that Clark's books operated through, moved onto a screen.
What has changed, and what has not
The entry barrier Clark met has largely gone. Women now take most of the marine biology degrees awarded in the United States and the United Kingdom, they are the majority in many graduate cohorts, and no research vessel refuses to carry them. The distribution further up is another matter: senior faculty positions, principal investigator roles and the directorships of large marine institutions remain disproportionately male, and the gap widens at every step.
The other thing that has not changed is the argument Clark spent her life making. She kept sharks alive and watched them because she thought the animals were being described by people who had only ever seen them dead or frightening, and she was right. That case still has to be made — against the display-tank version of a shark on one side and the film version on the other — and the people making it are largely the ones who grew up reading her. For where this fits in the longer story, see the history of sharks.
Frequently asked questions
Who was the Shark Lady?
Eugenie Clark, an American ichthyologist born in New York in 1922 and active until shortly before her death in 2015. The nickname came from the press and stuck because she worked directly with live sharks for decades, keeping them in pens, running behavioural experiments and diving with them long before that was a normal way to study the group.
Why is Eugenie Clark important to women in science?
Because she did the work at a time when almost no women were doing it, and then built the structures that let others follow. She founded and directed her own marine laboratory five years after her doctorate, taught zoology at university level for twenty-four years, supervised graduate students, and wrote popular books that reached readers who had never met a scientist.
What did Eugenie Clark discover about sharks?
Her best-known result is that sharks learn and retain what they learn. She trained lemon sharks to work a target for food, stopped for ten weeks, and found they still performed the task. She also showed that the secretion of the Red Sea Moses sole makes sharks release it, and examined resting requiem sharks in Mexican caves.
Did Eugenie Clark discover the Moses sole?
No, and the claim appears in a lot of profiles. The fish was described scientifically in the early nineteenth century and was well known to people fishing the Red Sea. What Clark established was the effect of its milky secretion on sharks, which released the fish within seconds, and the active compound was later isolated and named pardaxin.
Is a shark species named after Eugenie Clark?
Several fish are, and the best known shark is Genie's dogfish, a deep-water species described in 2018 from the Gulf of Mexico and the western Atlantic, three years after she died. Having a species named for you is the standard way taxonomists acknowledge a career, and hers collected more than one.
What is the Gills Club?
A programme run by the Atlantic White Shark Conservancy that connects girls with women working as shark scientists, through profiles, events and direct contact with researchers. The premise is the one that made Clark's own books effective: a career is much easier to imagine once you have seen somebody who looks like you doing it.
Are most marine biologists women now?
At the entry level, yes. Women take the majority of marine biology degrees in the United States and the United Kingdom and make up most of many graduate cohorts. The balance shifts sharply higher up, where senior academic posts, principal investigator roles and institutional directorships remain disproportionately held by men.
How old was Eugenie Clark when she stopped diving?
She was still diving in the final year of her life, at 92, and was planning further field work when she died in February 2015. She had been making deep submersible dives into her seventies and eighties, and the continuity is part of why she remained a visible figure in the subject for roughly six decades.
References
A small team focused on researching sharks and making marine biology easy to understand. Every page is reviewed against current species records and the SharkSider attack database, and updated when new incidents or research appear.
Published December 26, 2016 · Last updated September 23, 2026 · Filed under Blog.
