By Tracy Crews
This post is part of a series about the 2018 STEM research cruise taking place this week on board the R/V Oceanus. Other posts in this series include Tracy’s report from Day One, and a post from high school student Alishia Keller from Day Two.
Pacific white-sided dolphins
We started out our research cruise off the Oregon Coast, but as the wind increased down south impacting visibility, we tried our best to outrun it by heading north, into the waters off of Washington. We started out the day over Gray’s Canyon, surrounded by thick fog, wondering if we had traded one weather problem for another. But as the sun rose higher in the sky it burned off the fog and we were able to resume our survey tracks, zig-zagging back and forth from the shallower edge of the canyon, through the deeper water, then back to the other side again. Our quest today was to find those large, elusive whales known to prefer deep water, like sperm whales, beaked whales, and blues.
It wasn’t long before we saw a large pod of Pacific white-sided dolphins, estimated to be 230 in number by our two marine mammal researchers. Soon the dolphins surrounded the boat, darting out of wave crests, performing acrobatics and dancing in the wake of the vessel. The speed and agility they displayed was truly astounding. But as much as we enjoyed their antics, it was time to resume our search for their larger relatives.
Sperm whale fluke
Soon thereafter, as we made our way into deeper water, a solitary sperm whale was spotted. Everyone was excited to see such a rare sight but it wouldn’t last for long. Immortalized in books like Moby Dick, these large, toothed whales are impressive divers and once submerged can stay down for 45 minutes or more. Unsure when or where it would resurface, we continued along our survey transect.
As we moved back into shallower waters, we began to see more of the humpback whales that we have become so familiar with over the last few days. Most were traveling in small, close-knit groups, synchronized as they moved through the water. Others could be seen diving together then “logging” at the surface, floating to conserve energy and recover before diving once again.
More oceanographic surveying
As the day wound down and wind picked up, we shifted gears to conduct some more CTDs (oceanographic surveys) and decided to conduct another nighttime plankton tow to compare to what was caught the previous night in the Astoria Canyon, off the Columbia River. As we gathered outside on the back deck to watch the sun sink below the horizon, one of the teachers pulled out his guitar and harmonica and we were presented with one last amazing gift, something mariners often wait a lifetime to see- a green flash.
Waiting for the green flash
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Tracy Crews is the Marine Education Program Manager for Oregon Sea Grant, the Student STEM Experiences Coordinator for the Oregon Coast STEM Hub, and the Principal Investigator for the STEM research cruise taking place this week on the R/V Oceanus.
This cruise is funded by Oregon Legislative funds with additional support from Oregon Sea Grant and Oregon State University. Track the R/V Oceanus at marinetraffic.com, and see more photos of this expedition on the Oregon Coast STEM Hub Facebook page.
