NOAA Teacher at Sea Donna Knutson NOAA Ship Oscar Elton Sette September 1 – September 29, 2010
Mission: Hawaiian Islands Cetacean and Ecosystem Assessment Survey Geograpical Area: Hawaii Date: September 15, 2010
Mission and Geographical Area:
The Oscar Elton Sette is on a mission called HICEAS, which stands for Hawaiian Islands Cetacean and Ecosystem Assessment Survey. This cruise will try to locate all marine mammals in the Exclusive Economic Zone, called the “EEZ”,aound Hawaii. The expedition will cover the waters out to 200 nautical miles of the Hawaiian Islands.
Also part of the mission is to collect data such as conductivity for measuring salinity, temperature, depth, chlorophyll abundance. Aquatic bird sightings will also be documented.
Science and Technology:
Latitude: 27○ 40.6’ N
Longitude: 175○ 48.7’ W
Clouds: 3/8 Cu, Ci
Visibility: 10 N.M.
Wind: 12 Knots
Wave height: 1-2 ft.
Water Temperature: 27.5○ C
Air Temperature: 27.0○ C
Sea Level Pressure: 1021.2 mb
Orca is another name for Killer Whale. They are some of the best known cetaceans. Killer whales are the largest members of dolphin family.
Killer Whales are easily recognized by their huge dorsal fin that is located in the middle of their backs. The male’s dorsal fin is usually between three and six feet high. Orcas have unique flippers that are large broad and rounded. Their bodies have a black and white color pattern.
The male Killer Whale can reach thirty feet long and weigh at least twelve thousand pounds. The females are smaller in size reaching only twenty-six feet long and weigh eight thousand four hundred pounds. The females may outlive the males by twenty to thirty years, living between eighty to ninety years.
Killer Whales are not limited to any particular region. Depending on the prey they prefer, Killer Whales can be found in cold or warm climates. Orcas have a varied diet which may consist of fish, squid, large baleen whales, sperm whales, sea turtles, seals, sharks, rays, deer and moose. Pods tend to specialize in a particular food and follow it. Killer Whales tend to use cooperative hunting groups for large prey.
Orcas form matrilineal groups sometimes containing four generations. All females help with calf rearing. The females are more social and may be associated with more than one pod, but males are usually by themselves. One group near British Columbia contained approximately sixty whales.
Killer Whales are not endangered, but numbers are declining in Washington and British Columbia. The reasons for the decrease in whale numbers is not known, but possible factors may include chemical or noise pollution or a decrease in the food supply.
I was just leaving the bridge after the XO (executive officer) asked me if I would like to join her and Doctor Tran to Midway tomorrow. I knew we were stopping to pick up Jason, a Monk Seal Biologist who needed a boat ride from Midway to Kure Island, but I heard no one was going ashore. So when she asked, I was totally thrilled and extremely excited to get my feet wet and of course said yes!
As I was leaving the bridge I decided to check out what was doing on the flying bridge. When I got up there, everyone was on goggles or the big eyes, so I asked Aly what was going on. She said someone saw a “black fish”, meaning something was seen, but not identified, and she offered me the big eyes she was looking through. I looked maybe for five seconds and said, “I see it”! This is very rare for me to see something so quickly! I’m thinking, “I just saw a KILLER WHALE!!” but no one was excited or talking about it. So now I begin to doubt myself, “That was a Killer Whale right?”
In the middle of my self -doubt, Adam comes running up the ladder screaming, “KILLER WHALE!!” Drat why didn’t I say anything! There wasn’t only one, but five killer whales! One was a mother with her small calf! Wow what amazing animals! I couldn’t stop staring, and I wasn’t the only one. There was a “full house” on deck again with everyone oooing and ahing.
Orcas aren’t typically seen in this area, but then again this is a survey ship, and this area hasn’t been surveyed in a very long time.
When the small boat was launched to try and tag one of the adult whales with a tracking device, they dove never to be seen again. These animals are just too smart. What an extraordinary experience!
Tomorrow I will have another adventure! An adventure few people have taken. I am going to Midway. Midway Atoll is now a National Wildlife Refuge and also holds the Battle of Midway National Memorial. I’m off to see a glimpse of our nation’s past and a birding and seal paradise!