Mission: 2009 United States/Canada Pacific Hake Acoustic Survey
Geographical area of cruise: North Pacific Ocean from Monterey, CA to British Columbia, CA.
Date: July 24, 2009
Weather Data from the Bridge
Wind speed: 24 knots
Wind direction: 355° from the north
Temperature: 17.3°C (dry bulb); 15.5°C (wet bulb)
Sea water temperature: 9.8°C
Wave height: 3 ft.
Swell direction: 350°
Swell height: 5-6 ft.
Science and Technology Log
There is an abundance of marine life in the ocean today: sightings include a humpback whale breaching and spy-hopping. Breaching is when a whale jumps out of the water. Spy-hopping is when the whale’s head comes out of the water vertically and “takes a peek” at his surroundings. We also sighted the Pacific white-sided dolphins that appeared to be “playing” with the ship. They would swim perpendicularly to the ship’s hull and at the last minute; veer away at a 90° angle. The dolphins were also swimming alongside the bow and the side of the ship.
The sonar signals indicate an abundance of marine life under the sea and the presence of marine mammals helps us draw that conclusion. All that life is probably their prey. We made 2 fishing trawls which included hake and 2 small squid, split nose rockfish, and dark, blotched rockfish. That was the first time I had seen rockfish. They are primarily a bottom dweller. Scientists don’t want to catch too many rockfish because they tend to be over fished and their numbers need to be protected. Also, we only want to catch the fish species we are surveying, in this case, hake. The scheduled camera tow was cancelled because we did not want to catch marine mammals. The camera tow is described as a net sent down to depth that is opened on both sides. It takes video of the fish swimming by. This helps the scientists determine what species of fish are at each particular depth, during which the fish are not injured for the most part.
It was very exciting to see the humpback whale and dolphins today. They appeared to be very interested in the ship and it looked like they were playing with it. It was a perfect day with the sun shining and calm seas.
Question of the Day
What are ways scientists determine the health of the ocean?
Did You Know? Breaching is when a whale jumps out of the water. Spy-hopping is when the whale’s head comes out of the water vertically and “takes a peek” at his surroundings.
Animals Seen Today
Marine mammals: Pacific white-sided dolphins, California sea lion, and Humpback whale: spy hopping.
Birds: Fulmar, Shearwater, Albatross, and Skua.
Fish: Hake, Split nose rockfish, and Dark Blotched rockfish.
Ode to the Miller Freeman
As the chalky white ship, the Miller Freeman cuts through the icy blue waters of the North Pacific Ocean,
I stand in wonderment at all I see before me.
A lone Pacific white-sided dolphin suddenly surfaces over the unending mounds of waves.
A skua circles gracefully negotiating up and over each marine blue swell
Off in the distance, the band of fog lurks cautiously, waiting its turn to silently envelop the crystal blue sky.
Watching this beauty around me I have arrived, I am home.