NOAA Teacher at Sea
Krista Fleming
Aboard NOAA Ship Oregon II
September 5-20, 2026
Mission: Shark/Red Snapper Bottom Longline Survey, Leg 3
Geographic Area of Cruise: Western Gulf of America
Date: September 17, 2026
Weather Data from the Bridge
Latitude: 29°26.7622 N
Longitude: 94°12.5035 W
E/NE Winds 21 kts.
Seas 4ft E/NE at 4 seconds
Operations are currently suspended due to weather conditions.
Science and Technology Log
CTD Deployment
Since learning about the CTD (Conductivity, Temperature, and Depth) from Dr. Miller-Way at the Dauphin Island Sea Lab years ago, I have been excited to finally help deploy one as part of our survey. The CTD is much more than a device that measures conductivity, temperature, and depth—it is essentially a package of sensors that gives scientists a detailed picture of the water column and the seafloor.
At each station we encounter, we deploy the CTD to collect a sample. I help attach the camera and light and remove the protective caps covering the tubes where the water samples are brought to the sensors before deployment. Once the CTD is lowered to the bottom, the camera captures images of the seafloor. The scientists use these images, along with two weights secured to the bottom of the CTD that disturb the sediment when they reach the seafloor, to help determine the bottom composition—such as whether the substrate is primarily mud or sand. Knowing the composition of the seafloor is another important piece of information for understanding the habitat where we are sampling and the types of species that may be found there.
As the CTD moves through the water column, its many sensors collect a wide variety of information:
- Conductivity: Measures how well the water conducts electricity, which is used to calculate salinity.
- Temperature: Records the temperature of the water at different depths.
- Depth: Tracks the CTD’s position in the water column.
- Dissolved oxygen: Measures the amount of oxygen dissolved in the water, which helps scientists understand the conditions available to marine organisms.
- Fluorescence: Detects fluorescence from chlorophyll-a, giving scientists an indication of the presence and relative amount of phytoplankton in the water.
- Beam transmission: Measures the percentage of light from a laser that travels through the water and reaches the sensor’s lens. Less light reaching the lens can indicate more suspended particles in the water, providing information about turbidity.
- Sound velocity: Measures how quickly sound travels through the water. Sound velocity is affected by factors such as temperature, salinity, and pressure and is important for understanding how sound travels underwater.
- Voltage: Monitors the electrical output from the instruments and sensors and helps the scientists make sure the equipment is functioning properly.
- Altimeter: Measures the distance between the CTD and the seafloor as it approaches the bottom. This helps the crew know when the CTD is getting close to the seafloor and helps prevent the instrument from hitting it too hard.
Once the CTD comes back aboard, I help rinse the sensors thoroughly with fresh water to remove salt and help protect the equipment. Properly preparing, handling, and caring for the instruments is an important part of the process and helps ensure the CTD is ready to collect accurate data on the next deployment.
It has been really interesting to see how much information can come from one piece of equipment. The CTD gives scientists a detailed snapshot of what is happening throughout the water column—from temperature, salinity, and dissolved oxygen to phytoplankton and turbidity—while the camera gives us a look at the seafloor itself. Together, all of this information helps scientists better understand the habitat where we are conducting our survey.
Personal Log
After completing a haulback, we caught several snapper that were going to be used for research. Sean has been practicing Gyotaku, a traditional Japanese art form that uses a real fish to create a detailed print, and he let me observe him in action.
He carefully coated the fish with black paint and then gently pressed a piece of fabric canvas over it. When he lifted the canvas, the image of the fish was transferred onto the fabric, capturing its shape, scales, fins, and other intricate features.
It was fascinating to watch Sean turn one of the fish from our survey into a piece of art. I especially enjoyed seeing the details that emerged in the print—features that are easy to overlook when simply looking at a fish. It was a fun opportunity to learn about a hobby he enjoys while at sea.
Meet the Deck Crew!
Sean Gronquist
Sean serves as the Acting Chief Bosun aboard the ship, but his primary title is Lead Fisherman. Safety is his top priority, both for the crew and for the animals we are handling. He has been sailing for two years, but his experience on the water extends well beyond his time aboard the Oregon II. He has captained boats, works as a charter captain and Yamaha technician, and spends much of his free time around the water. He enjoys climbing, free diving, and surfing, and when he isn’t working, you can often find him fishing off the stern of the ship.
The shark bottom longline survey is Sean’s favorite survey, and it is easy to see why when you watch him work. When a shark is brought aboard, Sean is responsible for overall deck safety and for managing and controlling the cradle operations. Once the shark is secured in the cradle, he takes control of the animal’s head and works to keep both the shark and the crew safe.
Sean explained that controlling a shark requires commitment. If you hesitate or fail to commit to what you are doing, an accident can happen. He has learned to read the shark’s behavior closely. He says you can sometimes feel the surge of adrenaline in a shark before it panics. As the shark begins to tense, he can often anticipate when it is about to thrash and prepare for the movement.
What stood out to me was that Sean’s focus isn’t simply on controlling the shark—it’s on maintaining safety while also prioritizing the well-being of the animal. Watching him work made it clear that handling these animals requires experience, confidence, communication, and a deep respect for the wildlife we are studying.
Joseph Pastusek
Joseph is an Ordinary Seaman aboard the Oregon II, an entry-level position in the deck department. He has been sailing for two years and is currently augmenting the crew, which means he is filling a position for this particular leg of the mission. When this mission is complete, he will return to his regular ship, the NOAA Ship Ronald H. Brown.
Joseph assists with many of the ship’s operations and operates some of the machinery used during our surveys, including cranes and winches. One of his responsibilities during our survey is helping deploy the CTD using the J-Frame, the movable arm that extends over the side of the ship to lower and retrieve equipment. He also assists the crew with a variety of other deck operations throughout the mission.
When I asked Joseph about his favorite place he has sailed for work, he immediately chose Iceland. He loved the scenery, but what really stood out to him were the people and the culture. He described everyone as happy and welcoming. While there, he had the opportunity to see the Northern Lights and encountered plenty of dolphins and seals.
His time at sea has taken him to some pretty incredible places. He has sailed across the Equator and traveled as far north as the Arctic Circle. For someone who has only been sailing professionally for two years, he has already experienced quite a bit of the world from the deck of a ship.
Alasdair O’Brien
Alasdair is augmenting the crew for this leg of the survey. On his permanently assigned ship, the NOAA Ship Ronald H. Brown, he serves as a Bosun Group Leader. In that role, he helps run the deck and steps into the Bosun role when the Bosun is away. The Ronald H. Brown is currently undergoing repairs following a fire in the engine room, so Alasdair is spending this mission aboard the Oregon II.
Alasdair has been with NOAA for approximately five years and has gained experience sailing throughout much of the United States. He has worked along both the East & West Coasts, all five Great Lakes, and has spent time in the Bering Sea. His career at sea actually began on traditionally rigged sailing ships, giving him a unique background that combines traditional sailing with modern oceanographic research.
His work has taken him into a variety of research environments. In Alaska, he worked aboard the NOAA Ship Oscar Dyson conducting midwater trawl surveys used to collect information that helps establish sustainable catch limits for the pollock industry. He has also assisted with deploying weather buoys and works on a variety of fishing research projects.
When he isn’t working for NOAA, Alasdair continues to spend time on the water. He works aboard tall ships and participates in oceanographic educational programming through the Sea Education Association, helping teach others about marine research and life at sea.
One thing Alasdair emphasized is that so much of the experience at sea is determined by the crew and how you choose to make the most of the experience. After hearing about the places he has sailed and the people he has worked with, I can understand why that perspective is so important. Life at sea brings together people from many different backgrounds, and the crew becomes an important part of the experience.