In this podcast episode, Katie interviews Chloe Mikles, a PhD student studying bluefin tuna. They discuss Chloe's research on bluefin tuna and blue marlin movement ecology and population structures. Chloe explains the process of tagging fish and the importance of tracking their migration patterns. Katie and Chloe also talk about the bluefin tuna fishery in North Carolina and the international management of bluefin tuna populations around the world. Chloe shares her background and interest in studying bluefin tuna and discusses her PhD work on population differentiation. They also touch on the handling and care of tagged fish and the differences between handling bluefin tuna and billfish. In this conversation, Katie and Chloe discuss the tagging and tracking of marlin and tuna throughout the Atlantic Ocean. They explore the use of satellite tags and archival tags to collect data on the fish's behavior, including their location, depth, and temperature, and why it is important. They also discuss the challenges of tag recovery and the importance of collaboration with fishermen. The conversation highlights the physiological adaptations of bluefin tuna and their exceptional ability to cross the ocean. The rebound of the bluefin tuna population is also discussed, along with the importance of fisheries management and the economic impact of the fishery. Chloe offers advice for young scientists, emphasizing the importance of following one's passion and staying open to opportunities. Takeaways Chloe Mikles is a PhD student studying bluefin tuna and blue marlin movement ecology and population structures. Tagging fish is an important part of Chloe's research to track their migration patterns and understand population differentiation. The bluefin tuna fishery in North Carolina is regulated by size limits and quotas, and the fish are harvested for commercial purposes. International collaboration is crucial for the management of bluefin tuna populations, as they are highly migratory and cross the jurisdictions of many nations. Proper handling and care of tagged fish, such as minimizing air exposure and swimming the fish before release, help reduce mortality rates. Satellite tags and archival tags are used to track the behavior of marlin and tuna, providing data on their location, depth, and temperature. Tag recovery missions can be challenging, as the tags are small and can be difficult to locate in the vast ocean. Bluefin tuna are endothermic fish, able to regulate their body temperature and withstand a wide range of temperatures. Foraging hotspots and oceanographic conditions play a role in the feeding patterns and migration of bluefin tuna. Collaboration with fishermen is crucial for successful research and fisheries management, as they have valuable knowledge and observations of the fishery. The rebound of the bluefin tuna population demonstrates the effectiveness of strict management regulations and the importance of sustainable fishing practices, despite the many challenges that can be derived from these efforts. Find Chloe on instagram at @coastal_chloe ----more---- TRANSCRIPT Katie (00:22.905) Hey, what's up you guys? Welcome to the Katie C Sawyer podcast. I'm sitting here with Chloe Mikles, a remarkable young woman that I have been fan-girling over on the internet for years now. Chloe, thank you so much for being here with me. Chloe (00:37.698) Thank you so much for having me. Yeah, I feel like likewise, I've been fangirling over you for years too. So it's always fun to sit down and talk with you. Katie (00:45.849) That's so sweet. I really appreciate it. All right, you guys, Chloe is a PhD candidate at Stanford University, working with Dr. Barbara Block, a legend, studying bluefin tuna and blue marlin, movement ecology and population structures. Chloe, can you tell our listeners just like a brief synopsis of what that means? Chloe (01:07.882) Yes, so yeah, we oftentimes get caught up with like tossing in a lot of scientific jargon with our work. So Basically, I am in graduate school and for my dissertation work. I am learning from my advisor Barb Block and I am doing everything from going out into the field to tagging the fish which is the most fun part and probably what we'll talk the most about and then reading a bunch of papers to the scientific literature and I do some lab work as well, and then it all ends up, the culmination of the PhD is basically writing a bunch of scientific papers that summarize our findings. Katie (01:47.477) So what kind of questions are you asking about these populations? Chloe (01:53.258) So you can start off like very, you can go from very simple to very complex, basically, these questions. The most basic question is, we're putting tags on animals to see where they go. And you can make that more and more and more complex. So for example, from Marlin in North Carolina, blue marlin have been tagged all over the world, but not that many have been tagged off the ...
