Tag: shark survey

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Heather Diaz, July 12, 2006

NOAA Teacher at Sea
Heather Diaz
Onboard NOAA Ship David Starr Jordan
July 6 – 15, 2006

Mission: Juvenile Shark Abundance Survey
Geographical Area: U.S. West Coast
Date: July 12, 2006

Science and Technology Log 

There was no swordfish, set done last night because of our excursion to Catalina Island.  Instead, we set our first line (shark line) at 6am.  We hauled in the line around 10am.  We caught 10 makos, 4 blues, 1 lancetfish, 3 pelagic rays, and 2 molas.  I had the opportunity to videotape the entire haul, which turned out to be one of our most productive.  1 mako died today during the haul because it had swallowed the hook and most likely suffered an internal injury. He was measured, weighed, and dissected for further research.  One of the makos we caught during this set was among the largest three we caught during this entire leg, and it was really interesting to see such a large shark, so close! We set our second line at around 12 noon.  We hauled it in around 4pm. We caught 7 makos and 2 blues.  Two of the makos we caught during this set were among the largest three we caught during this entire leg.

This Mako shark didn’t survive being on the longline. The coloring of the shark is truly beautiful, and their skin is very smooth in one direction, and like sandpaper in the other. If you look closely, you can see little spots on his nose, which are actually part of his hunting and defense mechanism, and he is able to “detect” things in the water from a long way. Makos don't have a protective “eyelid”, unlike Blue sharks. Karina and João have helped to preserve the jaw, and I cannot wait to show it to my students!
This Mako shark didn’t survive being on the longline. The coloring of the shark is truly beautiful, and their skin is very smooth in one direction, and like sandpaper in the other. If you look closely, you can see little spots on his nose, which are actually part of his hunting and defense mechanism, and he is able to “detect” things in the water from a long way. Makos don’t have a protective “eyelid”, unlike Blue sharks. Karina and João have helped to preserve the jaw, and I cannot wait to show it to my students!

Personal Log 

With our first set, things started off right off the bat with several makos.  Then, we got 2 humongous Sunfish (mola-mola)…and I mean they were huge! Then, we got a huge mako.  He was almost 2 meters long.  It was as long as the cradle itself! I couldn’t believe it.  Everyone was super excited and at that point. During the whole commotion, one mako was pulled over the side nearly dead.

We also had a lancet-fish which they hauled over the side while we were dealing with the monster mako in the cradle….and that was very much alive.  It was flipping all over the place.  Sean picked him up, took the hook out, and tossed it overboard. After we were all done and all the animals had been processed, we went over to look at the mako that they had brought on deck.  Although the mako was near death, it appeared to be still breathing a little, though it might have been a lingering reflex reaction.  After examining him on the deck, they weighed him and then started to dissect him. I have most of the dissection on tape.  It was very interesting to see where all the internal organs are located and to see how their muscle tissue is designed. Dr. Heidi Dewar explained how they use their muscle tissue design to actually preserve body heat. It was really fascinating.  I am excited to show my students her “lecture” on the muscles, and to share with them the dissection video, so that they can see what a shark looks like on the inside.  I think they will enjoy it.

During the second set, I was allowed to get down on the platform with the first two sharks…the first one, Dr. Suzy Kohin, Chief Scientist just explained everything.  The second one, I was able to get in there and actually do the stuff!  I collected the DNA sample of his dorsal fin…I put the tag in his dorsal fin…and, I gave him a shot of OTC in the ventral area. I also got to take its length measurement, which was freaky because I had to grab its tail and pull it straight. I don’t think the shark appreciated that much, and he squirmed a bit.  He was also bleeding. Dr. Suzy Kohin, the Chief Scientist, said that he was bleeding a bit because he had swallowed the hook.  I opted not to do the spaghetti tag (which involves shoving this metal tip into their skin) and I opted not to cut the hook out of its mouth,.…it just seemed really, really, really REAL…and I didn’t want to mess up and come out of it missing a hand or something…or worse, having unintentionally hurt the animal.

Anyhow, I gave my kneepads over to Daniele who jumped in and finished the haul for me on the platform while I did the gangions.  Which, turned out to be too bad, since we got some really huge makos on this haul…everyone was very excited about them.  I think the largest was about 197cm.  They put special tags in the really large makos, which they called a PAT (Pop-Up Archival Tag).  They explained that these tags, which look more like turkey basters, are used to report data on temperature, depth, and even longitude so that they can better track the makos and learn more about their behaviors. They are especially looking for information about diving behaviors and their temperature and depth preferences.  I would love to see what they find out from these fish!

They also use a SPOT (Smart POsition and Temperature) tag.  This is almost translucent and is bolted the dorsal fin (only on larger sharks).  It looks a little like a computer mouse and is oval shaped. This tag sends radio signals to a satellite whenever the animal is near the surface, and they can use this information to track precisely where the animal is in the ocean.

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Heather Diaz, July 11, 2006

NOAA Teacher at Sea
Heather Diaz
Onboard NOAA Ship David Starr Jordan
July 6 – 15, 2006

Mission: Juvenile Shark Abundance Survey
Geographical Area: U.S. West Coast
Date: July 10, 2006

This is a view of Avalon on Santa Catalina Island, CA.
This is a view of Avalon on Santa Catalina Island, CA.

Science and Technology Log 

They set a swordfish line at around midnight, and we hauled it in around 6am. We caught one blue shark and one pelagic ray. We then set the first shark set at around 8am.  We hauled in the line around noon.  We caught one blue shark and 6 mako sharks, though one of the makos escaped with the gangion, leader, and hook still attached.

After that set, we headed for Santa Catalina Island where we would have liberty ashore.  We were taken over to the port at Avalon by João Alves on the skiff, I went over with Natalie Spear, Karina De La Rosa-Mesa, and Chico Gomez.  Everyone, except those on watch, was allowed to go ashore. Even the CO, Alexandra Von Saunder was able to make a quick visit to Avalon.  Most people shopped and/or had dinner in a restaurant.  A few people even went swimming at the beach!  Everyone had to be back aboard the ship by 11pm.  Karina De La Rosa-Mesa and I went back to the ship with Sean Suk and João Alves on the skiff at 9:45pm.

Personal Log 

Again, sea lions and dolphins were playing nearby today.  I tried to get pictures/video of them, but it doesn’t come out well on tape.  I love watching them…they are so graceful, and they really look like they are having a great time playing!  One sad thing happened today during our sets…one shark got away.  Someone dropped the leader line in the water and he took off. We can only hope that he is able to work the hook out on his own, soon.

Everyone was very excited to be given liberty ashore tonight in Avalon.  There are several people who have had the chance to come to Catalina before, so they are especially looking forward to this excursion. Catalina has changed so much since I was there 25 years ago!  There are many more houses and condos now near the harbor. Though, the town and the touristy areas are pretty much the same.  We enjoyed shopping and walking through the tiny streets.  And, seeing the golf carts everywhere was very amusing.  The Wrigley Mansion, which sits above the harbor is very beautiful, and many of the homes on the hill over the harbor are just fantastic. The moonrise was amazing, as it came over the hill…I think it was a full moon. Everyone in town seemed to be having a great time, and it was nice to be walking on land for a change (though, it did feel like the whole island was still moving with the rolling of the waves, even though I know it wasn’t!). I am looking forward to finding the pictures we took of the island when I was a child to compare them to today…I bet a lot has changed!

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Heather Diaz, July 10, 2006

NOAA Teacher at Sea
Heather Diaz
Onboard NOAA Ship David Starr Jordan
July 6 – 15, 2006

Mission: Juvenile Shark Abundance Survey
Geographical Area: U.S. West Coast
Date: July 10, 2006

This is one of the Mako sharks that we tagged. You can see the “spaghetti” tag and the OTC tag on his dorsal fin. After we released him, he came back to see what we were doing on the platform. Mako sharks will usually dive down deep once we release them from the cradle, but this little guy wanted to come back for one more look.
This is one of the Mako sharks that we tagged. You can see the “spaghetti” tag and the OTC tag on his dorsal fin. After we released him, he came back to see what we were doing on the platform. Mako sharks will usually dive down deep once we release them from the cradle, but this little guy wanted to come back for one more look.

Science and Technology Log 

One team of scientists set a swordfish line at 3am.  We hauled in the swordfish longline at 6am.  We caught one pelagic ray. We set the first shark line at around 8am, and hauled it in around 12pm. We caught one blue shark.  We set the second shark line at around 2pm.  We let it soak an extra hour, and hauled it in around 6pm.  We caught one Blue shark, four mako sharks, and one pelagic ray.

I had an opportunity to take a tour of the engine room with 1st Engineer Chris Danals. We first visited the aft work room. Chris is crafting a wooden boat by hand! It is very neat looking. He said that he builds boats for fun. He showed me the rudder room, and it’s amazing to see how huge these two rudders are. They control the rudder from the Bridge.  In front of the aft work room is the engine room, which you have to climb down a ladder to get into. The noise is so loud that it is deafening, even with earplugs in.  He explained that there are two main engines, which are White Superior engines.  The port side engine is used to power the winch, which we use when we set/haul in the lines.

The starboard engine is the one we use to power the ship.  He said that the engines are diesel engines, and they get about 1 mile to the gallon.  Chris also explained that even though the computers monitor everything in the engine room, they still have to monitor all of the engines in person during each watch.  The engines are huge, each one being at least 6 feet tall and at least 15 feet long.  But, as Chris explained, it takes a lot of power to move a ship this large through the water! The ship’s top cruising speed is 10 knots, but he said we often travel only a few knots, especially when we are setting a line or hauling a line. And, there are times when we are not moving but a few feet per hour, while the longlines are soaking.

Another thing that Chris explained was how the ship makes water.  Since they can only bring a finite amount of water with them to sea, they have to rely on other methods to get fresh water once they are at sea. He said that they pump sea water in, then they use heat to separate the fresh water from the salt.  The only problem is that sometimes we aren’t moving, and the engines need to be hot in order to make water.

Personal Log 

This morning we were kind of between 4 islands: Santa Cruz/Anacapa, Santa Barbara, and Catalina. I think we are headed west today.  You can’t see land anymore, and the waves have become much more intense…several stomach dropping waves this morning and last night. It is very foggy today, and it is quite cool outside.  It actually looks like it might rain.

Everyone was a bit disappointed when our first two hauls yielded only 1 animal each.  But, the last set was better, and everyone is looking forward to seeing if the blocks farther out might have better luck.

The real treat today was a California sea lion (which has been named Eddie).  He was following us after the last haul, eating the mackerel that we were discarding.  Eddie followed us for about 15 minutes, he was quite happy and kept coming up to the surface to look at us and blow water out of his nose. He was so cute! Of course, since we had been having bad luck with the sets, I did not bring my cameras downstairs, so I missed getting a picture of the whole thing!  I am hoping that “Eddie” will come back tomorrow!

During the night, they had to sound the fog horn several times to alert other boats that we were in the area. I thought it was the general alarm at first, but then I realized that it was just fog.

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Heather Diaz, July 9, 2006

NOAA Teacher at Sea
Heather Diaz
Onboard NOAA Ship David Starr Jordan
July 6 – 15, 2006

Mission: Juvenile Shark Abundance Survey
Geographical Area: U.S. West Coast
Date: July 9, 2006

A Scorpion fish waits to have a DNA sample taken in the onboard tank. Dr. Russ Vetter caught the bottom-dwelling fish today and is doing research on Rockfish.
A Scorpion fish waits to have a DNA sample taken in the onboard tank. Dr. Russ Vetter caught the bottom-dwelling fish today and is doing research on Rockfish.

Science and Technology Log 

There was no swordfish set done last night, so everyone got up at 6am to do the first of the shark sets for the day. We hauled in the first set at around 10am.  We caught one mako.  We set the second line at around 12pm.  We hauled it in around 4pm. We caught 2 pelagic rays.

Personal Log 

We were just off the coast of Santa Cruz and Anacapa.  It was such a beautiful sight to see! Anacapa is very rugged, with lots of canyons and steep drop offs. I don’t think my pictures will do it justice!

A brown pelican decided to hang around today, so I got some good pictures of him. We tried to find him mackerel, but they were too big for him, and he just spit them back out.  Everyone was a bit disappointed into today’s turnout. But, Dr. Suzy Kohin, the Chief Scientist said that this block was not a very good spot for them during the last leg either (they repeat the survey in 2 different legs so that they get a better sampling).  We all hope that tomorrow we are able to catch more fish!  Dr. Russ Vetter fished between sets. He caught several Rockfish, most of which were orange colored. He said that these were bottom fish, and he is doing an independent research study on them.  He also caught a Halibut and a Scorpion fish.   He took DNA samples from them, then they were prepared as part of the barbecue!

Sean Suk caught a Sanddab this afternoon, but he threw it back in.  There were lots of boats….sailboats and motor boats around us while we were near the port…they kept coming by to check us out.  I’ve seen lots of big container ships while we’ve been in this area, as well. We went past an offshore oil rig this afternoon, and it was interesting to see just how close it is to the coastline of California!  I have seen oil rigs in Wyoming, but the offshore ones are very different. It was neat to be able to see one in person.

The exciting thing about today was that we had a barbecue on the aft deck.  We had kabobs and burgers. It was great!  The weather was gorgeous, and everyone laughed and a nice time.  The crew said that they have a barbecue almost every Sunday and that it is kind of like a tradition. We went to Channel Islands Harbor near Port Hueneme, CA.  They had to pick up some gear for the engineers at the port there.  The weather became a bit cool after the sun went down…and I think I will have to close the door to my stateroom because it will probably be too chilly!  We enjoyed watching the sunset, and we are all looking forward to another week together.

After it got dark, we went down to the bow observation chamber, which is way down in the belly of the bow, below sea level. You have to climb down through 2 locks and down about 30 stairs, straight down. It’s kind of scary down there.  There are 4 portholes which look out from the bow of the ship, and we could see the phosphorescent critters in the water. They glow green. It was very surreal.  Jason Larese, Stephanie Snyder, Daniele Adrizzone, and I went down, then Ryan Harris joined us about half way through.  Climbing up was not as scary as going down was!  I made it out safely, but unfortunately, I couldn’t get anything to show up in pictures.

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Heather Diaz, July 8, 2006

NOAA Teacher at Sea
Heather Diaz
Onboard NOAA Ship David Starr Jordan
July 6 – 15, 2006

Mission: Juvenile Shark Abundance Survey
Geographical Area: U.S. West Coast
Date: July 8, 2006

Science and Technology Log 

This morning we set a special line for the Swordfish Feasibility Study.  This study is actually being conducted by Dr. Heidi Dewar, who has been researching sharks and other aquatic species for more than 14 years.  The purpose of this study is to see if swordfish can be caught using the shark sampling gear and handled safely for biological studies, such as tagging and sample collection.  To do this set, we used the same basic setup as we did with the sharks, with a few differences. First, the lines are made of monofilament A Mako shark is being processed in the “cradle”.  Stephanie instead of steel. Second, Snyder injects a Mako shark with OTC (oxytetracycline) which will act as a staining agent to help in identifying the age of the shark once it is caught.  Third, the bait used is squid, and each is baited with two.  Fourth, the leader lines also have a “Chemilure” on them, which is basically a light stick.  We have used yellow and green light-sticks. These light-sticks are clipped on the line near the bait, since swordfish will be attracted to the light.

A group of volunteer scientists set the lines at 3 am.  Then, the whole crew got up to haul in the lines at 6am. We didn’t catch any swordfish, but we did catch 1 blue shark and 1 pelagic ray. Around 8am, we set the shark line. We hauled in that line around noon.  We caught 2 blues and 2 makos. We had our abandon ship and fire drills today. For the abandon ship drill, I had to get my survival suit from my room, along with my hat.  I was already wearing a long-sleeve shirt and pants, so I didn’t have to bring those. I also had to put on a life-vest. My meeting location was the second boat. During the fire drill, all the scientists had to meet in the aft lab. Afterwards, (he’s not an officer, but a civilian employee) 2nd Mate, Richard (Pat) Patana, gave us a speech about safety and he went over all the rules and procedures for both types of emergencies.  It was very interesting to hear.  All of the crew members are actually trained in fire procedures, and they wear the same gear that a fireman on land would wear. They are also trained in water emergency procedures, and they have been trained to “plug” and repair breeches in pipes and the hull of the boat, if there is ever a need.

Around 2pm, we set the shark line again. We hauled in that line around 6pm.  We caught 5 blues, 1 mako, and 2 pelagic rays.

A Mako shark is being processed in the “cradle”. Stephanie Snyder injects a Mako shark with OTC (oxytetracycline) which will act as a staining agent to help in identifying the age of the shark once it is caught. The OTC will also act as an antibiotic, though that is not the intended purpose of it. Rand Rasmussen covers the shark’s nose, mouth, and eyes to keep the animal calm, and to prevent injury. Dr. Russ Vetter (top left) holds down the tail of the shark to prevent the animal from thrashing.
A Mako shark is being processed in the “cradle”. Stephanie Snyder injects a Mako shark with OTC which will act as a staining agent to help in identifying the  shark’s age. The OTC will also act as an antibiotic. Rand
Rasmussen covers the shark’s nose, mouth, and eyes to keep the animal calm, and to prevent injury. Dr. Russ Vetter (top left) holds down the tail of the shark to prevent the animal from thrashing.

Personal Log 

During our last set, we accidentally lost a buoy.  I think it came unclipped from the line.  So, Chief Boatswain, Chico Gomez and Ordinary Fisherman Ryan Harris got the skiff down to go and rescue it, of course they couldn’t do it until the entire line had been set!  So, around 3pm, they asked me if I would go with them.  YEAH! Actually, two other scientists were able to go with us (Karina DeLaRosa-Mesa and Daniele Ardizzone).  It was a little scary climbing down off the boat because the ladder was a bit crooked.  However, it was safe, and everyone was able to get down without much difficulty.  We were able to go about 2 miles out away from the ship…which looked like a tiny little boat from so far away.  Unfortunately, I couldn’t bring my camera because we all got really wet. On the excursion, we saw a mola up close, it was right off the bow of the skiff…I could have touched it, but when we got close enough to reach out for it, it dove under the water and out of sight. They are really strange looking.  After about 30 minutes, Chico Gomez spotted the buoy and I got to reach down and capture it and pull it aboard.  That was cool. We made it back to the ship just in time for dinner.

Unfortunately, our foam floated away before anyone could catch it.  They will need to go back and look for it later.  Dr. Rachel Graham was helping Dr. Suzy Kohin “process” the fish and accidentally smacked herself in the cheekbone with the bolt cutters.  It swelled up into a goose-egg. It looks like it really hurts.  The OOD, Sean Finney, came down to take a report. But, no medical report was filed after all since it was not a serious injury.  Dr. Rachel Graham is ok, but her cheek is bruised and she has a black eye.  She was able to laugh about it later, but everyone feels very badly that she got hurt.  We will all have to be extra vigilant to try to avoid further injuries.

After we finished our haul, the crew decided to go and look for the foam, which took us way, way, way off course. But, we looked until the sun went down and couldn’t find it.  I personally think that the trawler that was near us when we lost it picked it up.  At least, I hope so!

Two Baleen whales were playing not too far away from the ship today!  They hung around for about an hour, of course every time I got my camera out, they would go under the water. And, I don’t think I was fast enough to get a good shot of them.  It was very neat to see the plume of water blast out from the surface of the water, and then we could see them roll gently in and out of the water.  They are such graceful animals.  I would love to get to see them a bit closer!

The air is very crisp and it smells fantastic.  The gentle rolling of the ship over the waves is very relaxing, and everyone has said that they have never slept better than they have the last few days! I am looking forward to a nice sleep, and another exciting day with the sharks!