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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Monk Seal Monday #1

As we’ve reported, earlier this year, one of Kauai’s regular-pupping moms (RH58) gave birth on Oahu, where she has spent most of her adult life. She pupped on busy Waikiki Beach. With the thousands of people who flock to Waikiki, it was a challenging time for, among others, NOAA’S marine mammal response team, lifeguards on the beach, DLNR’s DOCARE officials, and the many volunteers of the Hawaii Marine Animal Response team. They had to worry about the safety of mom and pup as well as the numerous swimmers, sunbathers, surfers, paddlers, and throngs of people who came out to see the newest member of the Hawaiian monk seal species. Plus, the seals themselves threw in a few of their own unique challenges. In the early days after pupping, RH58 chased off another adult seal or two in shallow water and on the beach. On two occasions, the pup, who came to be known as Kaimana after the beach on which she was born, slipped between the deteriorating walls of and inside the Natatorium. (Her real-time retrieval by the Hawaiian Monk Seal Science Program was recorded by Civil Beat.) She and her mom also scattered beachgoers when hauling out–with pup mouthing the left-behind beach gear–imagine a child’s slipper–of those who’d hastily departed to give the seals room.

Through it all, neither seal nor human was hurt. Thankfully.

The closest thing on Kauai to that kind of scene just might be Poipu Beach. Of late, we’ve had multiple seals–sometimes four and five–hauling out at the same time on this busy beach–resting, playing, and socializing. Frequently one seal will harass several others, forcing them back into the water for a play session that moves from the water aerobics class, to the snorkel area, and then into the keiki pool. These socializing sessions have occurred several times in the course of a single day.

It can be a stressful time for all involved–with vocalizing and flippers, sand, and water flying.

Volunteers have been trained to use the opportunity of people entering and exiting the water to educate them on the presence of the seals and the appropriate response to any interactions between human and seal that may occur. However, volunteers have been trained not to try and interact with people while they are in the water, so as not to create a panic.

The guidance for the public if approached by a monk seal in the water is to either stay motionless and let the seals swim by or to slowly swim away. But to never try to touch or follow a seal.

Here’s a very short clip that shows how close the encounters can be and in shallow water, at that.

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Update: RH38

 

Photo by Laura Grote © The Marine Mammal Center, NOAA permit #18786

In our recent “Field Report, we shared that RH38, a yearling female, had been observed steadily losing weight over the summer. On August 11, she was transported by a US Coast Guard C-130 to Kona, where she is being rehabilitated at Ke Kai Ola, the Hawaiian monk seal hospital.

As you may recall, RH38 was born to RK30 last year, our first birth of 2016.

When RH38 was admitted to Ke Kai Ola, she weighed 88 pounds, about half her size at weaning a year prior. It’s not unusual for monk seal weaners to lose weight as they learn how to forage on their own, but, clearly, RH38’s weight had dropped more so than other yearlings her age. An exam performed at Ke Kai Ola revealed RH38 was carrying a heavy infestation of tapeworms. Intestinal parasites are not uncommon in monk seals, but have been documented to inhibit growth and even cause death in young Hawaiian monk seals. After treatment, RH38 is now eating well and gaining weight a good clip. She’s expected to be released from Ke Kai Ola’s care in the next couple months.

“This is why we built Ke Kai Ola,” said Dr. Shawn Johnson, Director of Veterinary Science at the Marine Mammal Center, on the Center’s website. “If we want to save this species, every monk seal female counts, so we’re proud to be able to provide long-term rehabilitative care to monk seals like RH38 and ensure they are able to survive and thrive in their ocean home.”

Photo by Laura Grote © The Marine Mammal Center, NOAA permit #18786

Because RH38 will be released back into the Main Hawaiian Island population, where there’s a good chance she may encounter humans, the staff at Ke Kai Ola is taking great precaution in treating RH38 so that she does not associate humans with food. We want all our monk seals to continue to be the wild animals they are.

Click here to read more about the great work that Ke Kai Ola is doing with Hawaiian monk seals and other pinnipeds.

We’ll continue to report on RH38’s progress, so check back periodically.

 

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Field Report: September

V93 is now R7AA!

PC: B. Becker

A yearling female that showed up on our north shores in late June, made her way south in August. She hauled up several times at Lawai Beach where the NOAA Science Center scientists and veterinarian were able to capture and examine her healing abscess and, with the Kauai team, flipper tag her (7AA/7AB).

PC: B. Becker

She was given a long acting antibiotic, and fitted with a cell phone transmitter, so we can monitor her movements, foraging and follow her health.

Seals of Concern Updates

PC: M. Olry

RH38: A female yearling seal that was underweight, was transported August 11 by US Coast Guard C-130 to Kona, where she is being rehabilitated at Ke Kai Ola, the Hawaiian monk seal hospital. Her admission weight was 40 kg and she was treated for tapeworms, which were causing her to do poorly. She is eating well, and now is at 46 kg. She has two companions from the NWHI, one admitted in June and the other in August. The plan is to complete her treatment for tapeworms and to allow her to gain enough weight to insure her success after release in another month or two.

Hooked Seals
The adult male seal that was hooked in his back threw off the hook, and continues to be seen at Poipu, he is now freshly molted and known as Temp331.

An unknown seal was reported by a fisherman on the rocks at Kaumakani point last week. The hook is in the right corner of the mouth and is non-life threatening. We do not know of the identification of this seal, whether it has tags or its sex. It may be a young adult or subadult, possibly a Ni’ihau seal, so keep a lookout!

Seal Research

PC: B. Becker

The NOAA Pacific Islands Science Center research biologists were on Kauai for a week working with the Kauai team to find a subadult or adult male seal to deploy a new streamlined “critter” camera. Searching all coasts, practically all of Kauai’s seals were sighted! Many of the mature males were either starting or finishing their molts, so they were not candidates.

PC: B. Becker

Finally R1KT (molts in Dec.) was found on a quiet sandy beach. The team was able to capture him and place a camera (in front) and cell phone transmitter to help relocate him to remove the camera three days later to retrieve the footage. The instruments not only gave a visual video record of movements, but also location, depth of dives, time periods and speed! We look forward to learning what R1KT has to teach us!

We thank the many volunteers that searched with us and responded to mul- tiple seal haul outs to find a good candi- date. We also found a new large adult male, fairly clean, without scars, not known to our records. With additional experienced seal handlers, we were able to capture this seal and tag him. He is now called R2XS with tags (2XS/2XR).

Famous Waikiki Pup Translocated
RH58’s weaned pup, is now known by her tags at RJ58 and still remembered as Kaimana, the Ha- waiian name for her natal beach. Because of vari- ous risk assessments and considerations, she was translocated to a north shore beach to put her in a safe location, where she could interact with other seals and safely forage and explore without the human crowds and dangers at Waikiki.

Also the whole story written by a NOAA biologist can be found here.

Additional Marine Animal News
The State Board of Land and Natural Resources Approves New Boating Rules that will prohibit feeding of wildlife or feral animals, and abandoning animals, and creating or contributing to colonies at any property under the boating division’s jurisdiction. These new sections were added in response to complaints about increased feeding of feral animals at boating facilities, which creates potentially unsafe and unsanitary conditions and endangers sea life.

The board approved both amended rules but deferred implementation of a provision that would allow disposal of feral or abandoned animals at state small-boat harbors until Jan. 1, 2019. The delay was to give time for the boating division to work with animal caregivers to come up with a viable plan to relocate colonies of feral and abandoned animals to areas outside of the small-boat harbors.

NOTE: Cats are the only reproductive host of the parasite toxoplasmosis, which has killed monk seals, and continues to threaten human and other marine mammal health. Click here.

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