NOAA TEACHER AT SEA
ONBOARD NOAA SHIP OSCAR DYSON
JUNE 11 – JUNE 30, 2011
NOAA Teacher at Sea: Jason Moeller
Ship: Oscar Dyson
Mission: Walleye Pollock Survey
Geographic Location: Gulf of Alaska
Dates: June 17-18, 2011
Latitude: 52.34 N
Longitude: -167.51 W
Wind Speed: 7.25 knots
Surface Water Temperature: 6.6 Degrees C
Air Temperature: 7.1 Degrees C
Relative Humidity: 101%
Depth: 63.53 meters
All of the above information was found on http://shiptracker.noaa.gov. Readers can use this site to track exactly where I am at all times!
Welcome back, explorers!
It has been a very eventful 24 hours! We have started fishing, but have done so little that I will wait to talk about that in the next log. Tammy, the other Teacher at Sea, has not begun fishing yet, and as we will be writing the science and technology log together, I will save the fishing stories until she has had a chance to fish.
After turning in last night’s log, we managed to spot eight or nine humpback whales on our starboard side that appeared to be feeding at the surface. They were too far away to get any decent photos, but it was a lot of fun to watch the spouts from their blowholes tower up into the air.
This afternoon started off by dropping an expendable bathythermograph (from here on out this will be referred to as an XBT). The XBT measures the temperature and depth of the water column where it is dropped (there will be more on this in the Science and Technology section). I was told that I would be dropping the XBT this time, and was led off by Sarah and Abby (two of the scientists on board) to get ready.
However, the prank backfired somewhat. As the scientists were all laughing, a huge wave came up over the side of the ship and drenched us. I got nailed, but since I was in all of the gear, I stayed dry with the hem of my jeans being the only casualty. Sarah didn’t get so lucky. Fun times!
The probe is connected to a length of copper wire, which runs continuously as the probe sinks through the water column. It is important to launch the probe as far away from the ship as possible, as the copper wire should never touch the ship. If the wire were to touch the ship, the data feed back to the ship would be disrupted and we would have to launch another probe, which is a waste of money and equipment. The survey technician decides to cut the wire when he/she has determined that sufficient data has been acquired. This normally occurs when the probe hits the ocean floor.
This is a quick and convenient way to collect data on the depth and temperature of the water column. While the ship has other methods of collecting this data (such as a Conductivity, Temperature, and Depth (CTD) probe), the XBT is a simpler system that does not need to be recovered (as opposed to the CTD).
Pacific Sleeper Shark
Reader Question(s) of the Day!
Today’s reader questions come from James and David Segrest, who are two of my students in Knoxville Zoo’s homeschool Tuesday classes!
1. Did pirates ever travel the path you are on now? Are there any out there now?
A. As far as I know, there are no pirates currently operating in Alaska, and according to the scientists, there were not any on the specific route that we are now traveling. However, Alaska does have a history of piracy! In 1910, a man named James Robert Heckem invented a floating fish trap that was designed to catch salmon. The trap was able to divert migrating salmon away from their normal route and into a funnel, which dumped the fish off into a circular wire net. There, the fish would swim around until they were taken from the trap.
For people who liked eating fish, this was a great thing! The salmon could be caught quickly with less work, and it was fresh, as the salmon would still be alive when taken from the trap. For the traditional fisherman, however, this was terrible news. The fishermen could not compete with the traps and found that they could not make a living. The result was that the fishermen began raiding the floating traps, using any means possible.
The most common method used was bribery. The canneries that operated the traps would hire individuals to watch the traps. Fishermen would bribe the watchers, steal the fish, and then leave the area. The practice became so common that the canneries began to hire people to watch the trap-watchers.
2. Have you seen any sharks? Are there any sharks that roam the waters where you are traveling?
This is a Pacific Sleeper Shark. It is called a sleeper shark as it does not appear to move a great deal, choosing instead to glide with very little movement of its fins. As a result, it does not make any noise underwater, making it the owl of the shark world. It hunts much faster fish (pollock, flounders, rockfish) by being stealthy. They are also known to eat crabs, octopus, and even snails! It is one of two animals known to eat giant squid, with the other one being sperm whales, although it is believed that these sharks probably scavenge the bodies of the much larger squid.
The other shark commonly seen is the salmon shark. Hopefully, we will catch one of these and I will have photos later in the trip.