Science and Technology Log
The Trawling Net
The trawling net is used to collect groundfish samples. It is deployed from the stern of the ship and towed for 30 minutes. The net is towed back in and brought onboard to be emptied. During this process it is important that everyone at the stern of the ship is wearing a hard hat and a personal flotation device in the unlikely event that something goes wrong. Once the net is lifted over the side of the ship and brought on deck, it is untied and emptied into large baskets.
The baskets are weighed before they are brought inside and emptied onto a large conveyor belt. The fish are spread out on the belt so they are easier to sort. The fish are sorted into individual baskets by species. Once all of the fish are sorted, we count them and find their total weight. We then work through each basket and measure, weigh, and identify the sex of each specimen. Once we are done measuring the fish, some are bagged, labeled and frozen for scientists to examine back at their labs. The rest of the fish are thrown back into the ocean.
We found many different species of vertebrates and invertebrates (fish with a spine, and those without a spine). Here are some of the fish we found:
It is important to document the length and weight of each fish collected in a trawl. We used special measuring boards and scales to collect this data. There are two boards, each is connected to one computer. When we measure the fish, we use a magnetic wand. When it touches the board, it sends a signal to the computer which records the length of the fish. Fish are measure at one of three lengths: fork length, standard length, and total length. Once the fish are measured, they are placed on a scale to be weighed. The scale is also connected to the computer and records the weight of the fish.
Day 12 – July 16th
Today is my last day at sea before we dock in Pascagoula,Mississippi. It has been quite a journey and I can’t believe it is already over. Though the work was hard and hot (and many times smelly), it was an amazing experience and I hope to one day have the opportunity to experience it again! I have met many wonderful people and hope to keep in touch with them! I have learned so much about our oceans and the life within them. I hope that my blogs have given you a glimpse into what life onboard the Oregon II is like and I hope that you have learned something about the work that takes place on the open seas.
Although this is my last day on the Oregon II, keep an eye out for one final blog. There will be interviews with the crew of the Oregon II, what their job is, why they chose this line of work, the steps they took to become a crew member of the Oregon II, and words of advice for students everywhere!