Field Report: April 2018

 

Sightings:

The Kauai team logged 303 seal sightings this month. This included 30 individually identified seals.

April: 303
March: 299
Feb: 259
Jan: 336

New:

• RK13 gave birth to PK1 on 4/20/2018. Extensive monitoring was immediately set-up and continues. Unfortunately, the location is notorious for off-leash dogs and past conflict between beach users and the monk seal program. Thus far, only minor issues have risen. Pup continues to thrive.
• RK52 gave birth to stillborn female pup. This was RK52’s first birth. Carcass was sent to Oahu for necropsy.

Updates:

• NG00 was re-sighted once this month and is likely still hooked. (See previous monthly updates for background.)
• Poipu Keiki Pool: 2 displacements took place this month.
• Bleach markings: 2 seals bleach marked this month.
• Molting activity: one seal continues to molt this month.

Research/Support of Pacific Islands Fisheries Science Center:

• Sub-sampled scat, molt, and tissue plug samples.
• Logged all seal sightings. Thomton organized photos and reported sightings, molt tallies, survival factors to send to PIFSC.

 

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Field Report: March 2018

If you’ve heard about the storm that Kauai weathered over the weekend, some of you may be wondering about our Hawaiian monk seals. (If you haven’t heard about the storm, you can read more about it here.)

The Kauai Hawaiian Monk Seal Conservation Hui does not deploy volunteers to dangerous situations–during storms or otherwise–and didn’t yesterday, either; however, the general public reported four seals hauled out on southern and western shores yesterday. They were all reported to be fine. The brunt of the storm hit Kauai’s north shore. Obviously, monk seals are marine mammals and are much better adapted to handle rising waters than we mere humans.

Now, for the March Field Report:

Sightings:

The Kauai team logged 299 seal sightings this month. This included 30 individually identified seals.

March: 299
Feb: 259
Jan: 336
Dec: 270
Nov: 239
Oct: 225
Sep: 354

New

• AF (Adult/Female) R376 was observed on Poipu Beach with bait trailing from her mouth and with a significant loss of weight since her previous sighting six weeks prior, suggesting she’d ingested a fish hook. With 13 volunteers assisting, a trained response team crowded her into transport carrier, and she was moved to DOFAW baseyard in Lihue to await arrival of an Oahu veterinary team. A fish bone was discovered to be lodged in her mouth. It was removed, she was given antibiotics and released at Poipu Beach by the end of the same day. Read more about this swift and successful response here.
• JF (Juveniile/Female) R7AA hauled out onto the shoulder of the road near Brenneckes in Poipu. A visitor called the hotline, and later the seal was displaced into the water and away from the road entirely.
• Several reports of dogs chasing seals off the beach at Maha’ulepu were reported to the hotline. No seal injuries have been reported. DOCARE has been alerted.
• A report was made from a fisherman of a seal dead in a net 3.5 miles outside Nawiliwili Harbor. USCG provided vessel support to investigate and possibly retrieve. A large bill fish, not a seal, was found entangled in a large cargo net, partially eaten by sharks.

Updates on previously reports:

• NG00 is likely still hooked and was not sighted this month. SM (Small/Male) Sighted on Niihau in January. Photos match pictures sent in last September by fisherman of a hooked seal along Kaumakani on Kauai. Seal presents in good condition. Since hook is not life threatening, the Kauai response team will attempt to de-hook him the next opportunity that presents itself.
• Poipu Keiki Pool: no displacements took place this month.
• Bleach markings: 3 seals bleach marked this month.
• Molting activity: no seals molted this month.

Research/Support of Pacific Islands Fisheries Science Center:

• Subsampled serum samples from R376 for PIFSC and shipped to Oahu.
• Sub-sampled scat, molt, and tissue plug samples.
• Logged all seal sightings. Organized photos and reported sightings, molt tallies, survival factors and sent to PIFSC.

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Monk Seal Monday #15: R376 Response

 

R376 in robust body condition on December 21, 2017.

At 9:00 a.m. on Tuesday, March 6, a report was called in to the hotline of an adult female, R376, hauled out at Poipu with something hanging out of her mouth. Our monk seal response team suspected she may have had a fish hook stuck in her mouth and the dangling bits were bait. Upon arriving at the beach 30 minutes later, the organic material was still visible, but what was also evident to the team was that she’d lost quite a bit of weight since her last sighting one month before. The combination of the two issues prompted our local team to reach out to the Hawaiian Monk Seal Research Program–all disturbances/handling of endangered Hawaiian monk seals require clearance–and it was decided a physical examination was warranted.

R376 in thin body condition on March 6, 2018.

With the help of a trained volunteer team, R376 was easily herded into a transport cage and transported to secure location to await the NOAA veterinary team that was en-route from Honolulu to assist with the examination.

At 3:30 the seal was sedated and examined with radiographs taken from the head to stomach; however, no hooks were present. A visual inspection of the seal’s mouth revealed a large spinous fish bone lodged between the hard palette, left inner cheek, and tongue. The organic material dangling from her mouth was a large octopus arm that was caught on the fish bone. A pair of needle nose pliers were used to carefully remove the bone. An antibiotic injection was given, blood samples were taken for post morbillivirus vaccination titers, the seal was flipper tagged 7AU (left flipper) and 7AV (right flipper), and the sedation was reversed.

Small wound and infection from embedded fish bone.

 

Fish bone (top) and octopus tentacles (bottom).

R376/7AU was transported back to Poipu and released by the Kauai team by 6:30 p.m. The seal entered the water and departed the area.

 

If you come upon this monk seal (flipper tags 7AU/7AV), please give her wide berth while she recovers and regains her lost weight. But please take photos and report her whereabouts to our hotline: 808-651-7668.

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Field Report: January 2018

Sightings:

The Kauai team logged 336 seal sightings this month. This included 34 individually identified seals.

Jan:336
Dec: 270
Nov: 239
Oct: 225
Sep: 354

New Issues:

• R376, adult female, hooked with small j-hook in lip. Hook came out without intervention several days later.
• One new juvenile male, untagged and unknown, sighted on West Side.

Updates on previously reported issues:

• R7AA, juvenile female, was observed with a moderate injury to right cheek, possibly a hook pull-out or moray eel bite. Antibiotics were given. Close monitoring continued, wound currently healing.
• NG00, sub-adult male, was observed with a circle hook in lower right lip. Sighted on Niihau in January. Photos match pictures sent in by fisherman along Kaumakani in September of a hooked seal. Seal in good condition. Hook not life threatening. Will attempt to de-hook next time hauled out on sand.
• Poipu Keiki Pool: 3 seals displaced from Keiki Pool.
• Morbillivirus vaccinations: All vaccines on Kauai have expired. No further vaccinations will occur for the time being.
• Bleach markings: 1 seal bleach marked this month.
• Molting activity: no seals molted this month.

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Monk Seal Monday #11: Dive Reflex

Last fall, the Hawaiian Monk Seal Research Program placed dive recording tags on two monk seals that make their home in Kauai waters. We briefly wrote about it here. During one recording period, the two seals (R1KT and R7AA) both made numerous dives deeper than 150 meters (492 feet). One bottomed out at 170 meters (557 feet) and the other at close to 200 meters (656 feet).

These are mammals diving to 500 feet on a single breath of air. But that’s not unusual for monk seals. In fact, the deepest known dive for a monk seal occurred in 2003 when scientists in a Pisces submersible descended to a depth of 543 meters (1,781 feet). They were studying deep sea corals, submarine canyons, and seamounts when a Hawaiian monk seal swam into their field of view. The on-board microphone captured their reaction. It went like this:

“Whoa.”

“What’s that?”

“That’s a monk seal.”

“Oh my god.”

“No way.”

“Look it. Right in front of us.”

“No way.”

“Oh my god.”

So, how do they do it? How do monk seals dive to depths of 1,781 feet?

There are numerous physiological responses involved; collectively the process that allows monk seals to dive deep is known as “mammalian diving reflex.” It involves the respiratory and cardiovascular systems. Typically, before a dive, seals exhale completely. This allows their lungs to completely collapse and avoid gas transfer at depth that could cause nitrogen narcosis. Then, holding their breath, the heartbeat slows from about 125 beats per minute to as low as 10 beats per minute. This is known as bradycardia. A slowing heart rate reduces oxygen consumption. Too, blood is diverted from the limbs and all organs except the heart and brain. This is known as blood shift. It’s accomplished through a process known as peripheral vasoconstriction. Too, diving mammals have high blood volume. That is, elevated hemoglobin and myoglobin levels, which provides greater oxygen storage. The whole idea is to conserve oxygen consumption, so the seal can dive deeper and longer.

Simply, they can hold their breath, slow their heart rate, and direct blood to just the heart and brain. This also helps explain their torpedo-like shape and abbreviated pectoral fins.

Here’s a video of that astonishing 1,781-foot-diving monk seal.

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Monk Seal Monday #2

PC: B. Becker

In September, two Hawaiian monk seals were outfitted with dive recording tags that not only capture the seals’ location but time spent hauled out, time at the surface of the sea, and time spent (and depth of ) diving. Data from the tags is transmitted whenever the seals come within range of a cell phone tower. The instruments tags were affixed to the middle of the seals’ backs using an epoxy. When the seals next molt, the tags will fall off.

This first graphic shows the movement of the two tagged seals. The yellowish-green dots represent R1KT, a male. The red dots represent R7AA, a female. The graphs give us a look into three week’s worth of these two seals’ lives.In the graph on the right, we see the depths of R7AA’s dives. She records several dives in excess of 150 meters, but the vast majority of her dives log at under 100 meters of depth.

On the other hand, the majority of R1KT’s dives record upwards of 150 meters. There are numerous factors that could explain the differences. One, age. R7AA is a juvenile; whereas, R1KT is older. Too, underwater topography may affect their dive depths. Generally, according to science, monk seals like to forage on or near the ocean floor. They are generalist feeders and their diet includes a variety of fishes (eels, wrasses, squirrelfish, soldierfish, triggerfish, parrotfish), cephalopods (octopus and squid), and crustaceans (crab, shrimp, and lobster). Diet studies indicate they prefer prey that hides in the sand or under rocks, unlike most of the locally popular game fish (e.g. ulua, papio and ʻoʻio) and the proportion and type of prey consumed varies significantly by island, year, age and sex.

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(P)update #8

Last week, on a sunny day, our second pup of the year graduated to “weaner” status and was tagged RJ36. After about six weeks of dedicated nursing, RJ36’s mother, RK30, weaned him and headed back to the nourishing depths of the ocean to replenish the approximate one-third body weight she lost during the nearly six weeks she nursed RJ36 to a healthy weaner weight in the neighborhood of 175 pounds.

While the procedure to tag monk seal weaners only takes about five minutes, the effort to tag this pup took much longer–all due to the remote location of where RK30 chose to birth.

For years now, the Kauai Hawaiian Monk Seal Hui has been aided when accessing remote beaches by marine biologist Captain Tara Leota, sole owner-operator of Kauai Sea Rider Adventures. Captain Tara leads small groups of ecologically-minded guests on snorkeling adventures around Kauai. Captain Tara, her crew, and her guests welcomed our tagging team aboard her 25-foot rigid inflatable boat for the adventurous journey to find RJ36.

Currently, the way we track matriarchal lineage of monk seals is by visual observations of mothers and pups. As such, our goal is always to tag pups within days of their weaning. Once weaners start exploring other parts of the island and mixing with other monk seals, we cannot be sure of their lineage. Thus, Captain Tara has likely helped us know with surety the matriarchal lines of six or eight monk seals over the years. That’s a great effort.

Mahalo Kauai Sea Rider Adventures!

Photo credit: V. Bloy

Photo credit: V. Bloy

Photo credit: V. Bloy

Photo credit: V. Bloy

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