I had the awesome opportunity to participate in a research cruise for three days. The aim of our mission was to examine the distribution of langostino at all life stages: larvae, wayward teenager, adult. The langostino is a tasty crustacean, one you may have remembered from my adulations over seafood empanadas a few weeks ago.
It has been a while since I’ve spent a night on a boat. My main concern was getting seasick as I had been taking medicine for an irritated stomach. I had a sneaking suspicion that my doctor might not recommend copious vomiting as a weekend activity. But, armed with two different kinds of anti-nausea meds and a large supply of galletas de agua (saltines), I felt well-prepared for the eventuality. I wasn’t reassured by the small size of the boat, nor the way that it rocked in the super calm harbor. But, the weather gods were smiling, and we left the Dichato with glassy seas and one meter swells.
We went out on the Kay Kay II, the UdeC’s research vessel. There were two scientific teams onboard as well as a crew of six to do all the necessary sailing and machine wrangling. I was on a team of three from the LOPEL (Laboratorio de Oceanografía Pesquera y Ecología Larval) lab and our mission was to track the langostino’s baby phase. We would trawl the waters for zooplankton all night long. Why all night? Because during daylight hours, zooplankton, which are small marine animals that measure micrometers to millimeters, swim deep down in the water column to avoid visual predators and then swim back up to the surface at night to feed on yummy diatoms (algae) and rogue organic particles. At every station, we deployed the CTD; an instrument which is the oceanographic equivalent to an expensive and finicky swiss army knife. Using a winch attached to a cable, the CTD is sent down to a few hundred meters and measures the water’s physical characteristics (conductivity, temperature, and density) along the way. Next, we deployed the Tucker trawl, which is a series of nets that can be opened and closed at different depths so different points in the water column are sampled for zooplankton. After dragging them behind the boat for a few minutes, we pulled them back on, drained them, and added formalin to preserve them for later identification. Hopefully we would find some baby langostinos lurking in the mix.

Sending the CTD 500 meters down 
Bringing the Tucker trawl nets on board. There are three (you can count them!) 
Me showing off the cod end where the zoops get trapped 
This sample is full of euphausids, tiny shrimp.
When you’re working on a boat, time is a measured and dolloped entity. There were six stations to do and each station took us about an hour. When you add travel (around an hour between stations), the sampling, which we started at a crepuscular 18:00, took all night. With the help of the crew, Edu, Carlos, and I would deploy the CTD and the nets, then take a nap for an hour, and repeat. I never really fell into a deep sleep, just cherished the sensation of the boat speeding through the cresting waves, as this meant I could stay lying down. But then, the captain would hit the brakes and I could feel the boat slow against the swell, signaling that it was time to roll out of the bunk and start sampling again. I got to sleep for maybe two hours the next morning before I needed to get up again to run our stations backwards with the CTD.
Luckily, at this point it was the other team’s turn to trawl. But besides sending the CTD down, the LOPEL team was also in charge of collecting water samples at each station to measure oxygen and nutrients/organic matter content. For this, we used a handy bottle with an opening on both sides called a Niskin bottle. I’ve always thought that whoever invented the Niskin bottle was someone with a genius for beauty in simplicity. The Niskin bottle is used to sample water at whatever depth you want. It is a cylindrical tube with two stoppers connected to each other by an elastic running through the center of the tube. The stoppers are pulled back and snapped to the center of the bottle so the elastic connecting the two ends is under tension. The bottle is attached to the same cable that was used to lower the CTD. When the bottle is at the right depth, we attach a weight to the cable and send it shooting down the line. It hits the catch and releases the tension in the elastic, snapping the stoppers into place. Et voila! You have the a bottle of water from any depth strata desired.

Meanwhile, the other team was deploying the bottom trawl to capture the langostino on the sea floor where it had matured from its larval free-swimming form to its bottom dwelling juvenile stage. The other team had the interesting problem to contend with that the cable on the bottom trawl was too short to reach the sea floor. Their solution was to attach a long length of line to the trawl. This maneuver included dragging the net in the water from the aft deck (ship’s butt) to the foredeck (ship’s front) to deploy it. They were not able to reach the bottom the first time, but they did the next times as we sailed over shallower ground. It was interesting to see the mix of species within the trawl as well as the mix of year classes. One of the hauls had both crabs and adult langostinos, while another one heaped out juveniles. Most of the time sampling in the ocean feels like groping blind, but it’s always exciting because you’re never entirely sure what you’re going to get.
The cruise was short but packed. It was fun to reacquaint myself with a lot of ocean sampling equipment and learn about a new sea critter. Even though the seas were glassy, caution and experience did not allow me to try laying off the seasickness meds until we were well into the third day. But it was not until we were pulling into port that I realized that I had been on a boat overnight without throwing up once. A first! Hopefully not the last.

Juvenile langostino (so cute!) 
Looks like a good haul. 
Adult langostino. Not the species we targeted, but very pretty.

And I couldn’t resist adding a couple of seascapes. 
Morning fog. 
Evening birds. 
































