NOAA Teacher at Sea
Nicole Macias
Onboard NOAA Vessel Oscar Elton Sette May 31-June 28, 2009
Mission: Lobster Survey Geographical area of cruise: Northwestern Hawaiian Islands Date: June 24, 2009
Weather Data from the Bridge
Location: 25° 04.341’N, 169° 34.084’W
Wind Speed: 19 kts.
Air Temp: 26.1° C
This is the invasive Hypnea algae that we collected in the lobster traps.
Science and Technology Log
We finished collecting data on the lobsters of the North Western Hawaiian Islands. As soon as Bob, the Chief Scientist, is finished inputting his data I will give you a brief over view of the findings. During the entire cruise there was a special white bucket in “the pit” that was specifically for holding all the algae that would come up in the traps. Algae is like seaweed. We have lots of it in Florida, but it seems that the algae we collected on this trip are very different and there is a greater variety. Just as we have invasive species in Florida so does Hawaii. An invasive species is an alien species (transported to a location outside its native range) whose introduction does or is likely to cause economic or environmental harm. When we pull up the lobster pods and take out any organisms we also have a bucket for any algae.
The other day we collected algae called Hypnea musciformis. It is very invasive and was actually introduced to Hawaii from Florida! This algae is a huge threat to Hawaii’s near-shore reefs because it smothers the coral and the surrounding reef reducing diversity in the reef community. There are currently four efforts in Hawaii to manage the invasive algae situation. They have a volunteer-based algae removal effort, a mechanical suction system capable of removing large volumes of algae, research on biological control using native grazers and finally they are researching the feasibility of repopulation of native algal species. It is important for humans to understand their impact on the environment and invasive species is a great example to look at. One human bringing a species somewhere it doesn’t belong can destroy whole ecosystems.
Personal Log
Tomorrow we are going to Turn Island to pick up a few scientists that need a ride back to Honolulu. If the weather cooperates the scientists will get the opportunity to take the small boats and explore the island. I am excited because there are supposed to be quite a few seals that hang out on the beach. If we get to go on this adventure I will be sure to report back to you ASAP.
NOAA Teacher at Sea
Nicole Macias
Onboard NOAA Vessel Oscar Elton Sette May 31-June 28, 2009
Mission: Lobster Survey Geographical area of cruise: Northwestern Hawaiian Islands Date: June 20, 2009
Weather Data from the Bridge
Location: 23° 37.7’N, 164° 43.005’W
Wind Speed: 11 kts.
Air Temp: 25.6° C
Here is a picture of an otolith that has been extracted from one of the fish we caught.
Science and Technology Log
Even though the mission of this cruise is to conduct research on lobsters, we are helping out another scientist with his study on bottom fish. Three of the jobs on the rotation require bottom fishing at night. Every fish that is caught has to be “processed.” When processing a fish you have to indicate the type of species, its fork length, the gender and you have to collect its otoliths. The fork length is the distance from the fish’s upper lip to the end of the center of its tail.
To determine the fish’s gender and collect its otoliths you must dissect the fish. It is very messy business. First the scientist makes an incision from the fish’s anus all the way to the throat. From there you can open up the fish and locate its gonads, sex organs. By looking at the gonads you can determine whether it is a male or female. The female’s gonads are much larger and much more vascular, meaning they have more blood vessels in them. The scientist will then extract the gonads and place them in a jar with formaldehyde so that they can be taken back to the lab and further studied.
These are the females gonads of a fish. It is very important when cutting open the belly that you are very careful because the knife can easily cut into the gonads as it has in this picture. Notice all the blood vessels running through the gonads. This is characteristic of a female.
After removing the gonads, it’s time to extract the otoliths. Otoliths are the inner ear bone of a fish and are responsible for hearing and balance. There are two of them—one on each side of the spine at the base of the skull. They are very small, fragile bones so it takes a little finesse in removing them. The reason the otoliths are so important is because they can tell scientists a lot of important information on the life history of the fish. The otoliths have growth rings, kind of like a tree. The growth rings can tell scientists the age of fish as well as any environmental factors it encountered during that time period.
The purpose of the study is to re-estimate the life history for these important commercial fish species. The main species they are lacking data on is the opakapaka, Pristopomoides filamentosus. We have not caught very many of this species, but we have been catching quite a few ehu, Etelis carbunculus. This species is very similar to the red snappers we have in Florida and just the other day I caught a Butaguchi fish, which is related to the Jack family.
Here is a picture of me holding up the Butaguchi I caught. If you look in the background you can see the hydraulic bottom fishing rig that was used to catch the fish.
Personal Log
We are now at our second and last location, Maro Reef. There is no land to be seen for miles. At least at Necker we had something to look at. We are heading in to the last week of the cruise and it is easy to see that 30 days is a long time for some people to be out to see. I am fortunate that I have made some really good friends or else I would be really ready to get home.
I have had the free time to read some really great books and watch some movies I haven’t seen and probably would never have watched if I weren’t out to sea. Anyway, I am looking forward to my last week on the ship and hope to report back many exciting things for you!
Here is a picture of me in the safety boat, about to be lowered down so that we can deliver fresh fish to the near by NOAA vessel.
Chris Monsour is all smiles as he pulls up two Ehu during his first bottom fishing experience.
Science and Technology Log
Today was our last day at Maro Reef and now we are making the 36-hour trip to Necker Island 350 miles to the east southeast. We finished up trapping today early as the number of lobsters collected was greatly reduced by the time we got to the sets of 20’s. I had the job of assisting in the lab today. I would collect the lobsters from the buckets, identify the sex, and then hold in place so they could be measured. In the morning, we collected a lot of slipper lobsters, sometimes as many as 19 or 20 in a trap. There were some spiny, but not nearly as many as the slipper. After lunch we collected the sets of 20 and found quite a difference. Instead of lobsters, we were collecting hermit crabs, spider crabs, sea anemone, and other types of crabs. The differences may have to do with the sandy bottom or the greater deep of the traps. I have tomorrow off to do whatever, which may include finishing up the book I started 8 days ago.
In this log I am going to talk about bottom fishing, which is one of the activities we get to do during the evening. Bottom fishing is the name given to line-fishing with baited hooks on or very close to the sea bottom. This is a fishing method, which catches predatory fish that feed on bottom-living crustaceans, fish, etc. One or more hooks may be used. Deep-bottom fishing has been known for many years in the Pacific region, and has been practiced for generations in some of the remote island communities of the Pacific. In the old days fishing was carried out from paddling canoes using gear made from locally-available materials, and was a challenge to even the most experienced fisherman. We however have the luxury of modern bottom fishing gear such as a winch to help bring up our catch.
One of the reasons for the popularity in the fish that are caught by bottom fishing is the species caught never carry ciguatera fish poisoning. This is a type of natural toxicity, which originates from reef and lagoon fish that feed on toxic reef algae. Ciguatera fish poisoning causes illness and makes the affected person unable to eat seafood for a long time. The possible presence of ciguatera is a major cause of concern for many consumers of reef and lagoon fish. The fact that it never occurs in deepwater fish, due to their diet, makes these fish all the more valuable. Some of the fish we have caught include Ehu, Uku, Opakapaka, Kahala, Butaguchi and Gindai. (have fun pronouncing these).
Deep-bottom fishing gear can be made from a range of materials, but the basic structure is generally the same:
a mainline, several hundred meters long, to lower the hooks to the bottom.
a terminal rig, usually 2–5 m in length, with attachment points for the mainline, several hooks, and a sinker. The terminal rig can be made of nylon, or steel cable to resist cutting by the sharp teeth of fish or rough rocks and corals on the sea floor. The attachment points may be loops made on the ends of the terminal rig and at intervals along its length, or may be swivels knotted or crimped into the rig.
several hooks, each fixed to a short trace , which can be connected to or disconnected from the attachment points along the terminal rig. This allows the traces to be changed quickly and easily when damaged or when the size of the fish being caught calls for smaller or larger hooks.
a heavy sinker, 0.5–2 kg in weight depending on the strength of the current, to get the rig down to the bottom quickly. I do enjoy the bottom fishing and to date I have caught 3 bottom fish, 1 Kahala and 2 Ehu. In fact I have the record on the boat for the largest Ehu at 54.6 centimeters!
Chris Monsour holds up two fish caught during bottom fishing; Ehu (left) and Uku (right).
Personal Log
I am glad to have tomorrow off so to speak. It will be good to sleep in and catch up on all the e-mails I have gotten. As mentioned before, Necker Island in the past has been slow because of its proximity to the inhabited islands. The bottom fish we are collecting are being used to get an idea of the health of the reefs. During the processing of the fish, we collect weight, length, gonads, liver, fin, and bones from the skull. Ryan is collecting these for his research. It is a very interesting process and bloody one too.
Animals Seen Today
Spiny lobster, Slipper lobster, Ridgeback lobster (type of spiny), Sea anemone, Hermit Crab, and Spider Crab.
Questions of the Day
What can we learn from Hawaiian values and practices to guide our interactions with the land and sea today?
What can we do to help restore declining fish populations?
Weather Data from Bridge
Latitude: 22, 34 N
Longitude: 163, 10.46 W
Visibility: 10NM
Wind direction: 070
Wind speed: 25Kts
Sea wave heights: 4-5
Sea swell heights: 7-10
Seawater temperature: 24.7 C
Sea level pressure: 1019.5
Cloud cover: 3/8 Atocumulus, cumulus
Personal Log
As you could tell by the wave and swell heights, it has been ROUGH! The boat has been rocking like crazy. Things have been falling off of shelves, and if I didn’t have my sea legs, I would be spending most of my time in bed. In fact, it is even difficult to do that. Anyway, you want to hear something funny? You know the sculpture I’ve been talking about? Well I finished it today, but just as I was going to put it away because I had considered it PAU, the stool I was sitting on tipped over because of the rocking boat. I turned around to pick up the stool and the sculpture slid off the table onto the floor and smashed the face like a pancake. I didn’t know whether to laugh or cry, so I went outside jumped over the rails and tried to drown myself. No, I’m only kidding, I’m an adult. I went to the mess hall, got something to eat, and then watched a movie.
This morning I spoke with the Lead Electrical Technician John Skinner. He has been following the progress of the bust I am creating of Lead scientist, Chad Yoshinaga. He told me that he liked the sculpture and that it has been great having an art teacher at sea this time around. Apparently I am the first, and the perspective I have given has been interesting and different from the science teachers.
He is also the computer guy for the ship and he spends his spare time taking digital photos and putting together slide shows. Anyway, he asked me if I would like to see it, and of course I said yes. It was awesome! It was pictures that he and others had taken on many of the various trips out to the Hawaiian Archipelago. It includes pictures of the voyage I am on, only much better. He gave me a copy and I can’t wait to show you guys this DVD. It will blow you away! He also told me about a book called Archipelago that has fantastic photos of these atolls.
The rest of the day I worked on my sculpture and watched the fishermen. They caught Bull Dorado (mahi-mahi), Ahi and Uku. BeegBahgahs!!!
