Entangled Humpback Whale frees itself

Written by Tursiops. Posted in Uncategorized

At 7:30 a.m. on October 26, 2017, a fisher reported to the NC Marine Mammal Stranding Network an entangled humpback whale around 2 miles offshore of Oceanana Fishing Pier near Beaufort Inlet. NCMM Natural Science Curator Keith Rittmaster arrived on the scene around 9:00 a.m. The whale appeared to be immature based on the size, and was lively, breathing and diving somewhat normally, but clearly encumbered by parts of a monofilament gill net that had caused some injury to the whale. While Vicky Thayer and team from the NC Division of Marine Fisheries and NCSU CMAST along with Doug Nowacek and team from Duke Marine Lab readied boats, crews, disentanglement gear and tags, Keith stayed with the entangled humpback whale and photographed the injuries and entanglement. At 10:20, after a prolonged submergence of around eight minutes, the whale resurfaced with a burst of energy and lunged speedily away – it had apparently freed itself from the entangling gear. YAY! That was one lucky humpback whale (although the whale may not agree). Keith and Doug’s teams gathered both pieces of the net for subsequent examination by NOAA Fisheries Law Enforcement. The following day Vicky with a team from CMAST and Duke examined and photographed the net after stretching it out in a parking lot, and determined that the entire net had been collected – the whale was apparently gear-free! As we report this, curators of several regional humpback whale photo-identification catalogs are searching for sighting records of the individual whale. This case highlights the critical value of collaboration. Information about the NC Marine Mammal Stranding Network and the Atlantic Large Whale Disentanglement Network can be found at http://www.marinemammalsnccnc.com/ and https://www.greateratlantic.fisheries.noaa.gov/protected/stranding/disentanglements/whale/alwdn.html.

Photos by Keith Rittmaster, NC Maritime Museum, under NOAA Fisheries permit.

entangled humpback whale

The whale’s tail (flukes) showing the entangling net and injury.

entangled humpback whale

The whale’s blowholes.

entangled humpback whale

The distinctive color patterns and scars on the flukes may be helpful in identifying this individual whale.

entangled humpback whale

The whale’s distinctive dorsal fin may be helpful in identifying this individual whale.

Bottlenose Dolphin “Holly”

Written by Tursiops. Posted in bottlenose dolphin photo ID, Uncategorized

It’s “Holly”, so it must be summer: Bottlenose dolphin sighting

One of our best known summer bottlenose dolphins in Beaufort is “Holly”.  We identify her by photos that show the 3 very distinct notches on her dorsal fin – a process called “photo-identification”.  She is a mom (likely a great-grandmother by now) who we first identified in Beaufort in July, 1989.  We’ve seen her nearly every summer since then, and her dorsal fin looks very much the same today (27 years later!).  We’ve seen bottlenose dolphin holly approximately 100 times between Beaufort and Cape Lookout over the years, but only between April and October.  Her sightings here peak in August.  We believe Holly spends winters in around Wrightsville Beach – we’re still trying to figure that out.  Holly is a well-known dolphin along our coast among people studying bottlenose dolphins and is featured in the Animatronic Dolphin Discovery exhibit at the North Carolina Aquarium at Fort Fisher.  We haven’t seen Holly as much as we used to so it was a special treat to see her in the Newport River twice so far this summer.  You can see more photos of Holly and try your photo-ID skills at http://www.capelookoutstudies.org/dolphin-id-game/.

 

bottlenose dolphin holly

 

Lethargic Dolphin Nov. 2015

Written by Tursiops. Posted in bottlenose dolphin photo ID, Cetacean Studies, Uncategorized

In August, 2015, during a routine atlantic bottlenose dolphin photo-ID survey, Keith Rittmaster and Josh Summers of nc maritime museum / cape lookout studies encountered a dolphin intermittently rafting lazily at the surface in Back Sound. It appeared to be an unusual behavior but we could not determine a problem so we photographed the bottlenose dolphin and continued on. It was subsequently reported by boaters in the same area in August because the behavior was conspicuous.

Then in early November, 2015 we received multiple reports of a tursiops truncatus (bottlenose dolphin) “disabled”, “dying”, “with a shredded tail”, and ultimately the last report (as of this writing) on November 5th, 2015 was that it was “dead floating upright” in Beaufort Inlet. Dead dolphins don’t float upright and we found what was reported as “dead” on November 5th very much alive, and its behavior recalled our August encounter in Back Sound. But again, not being able to determine a problem, we took photographs and moved on.

Subsequent examination of photos from the 2 encounters confirmed our suspicion that the dolphin we saw Nov. 5th in Beaufort Inlet was the same individual as the one we saw in Back Sound in August. Also evident in the dolphin identification image above [or below?] is 1) it appeared skinnier in November, 2) the injury on its left side in August has healed, and 3) it had fewer Xenobalanus barnacles on its dorsal fin in November. What was reported as a “shredded tail” was actually barnacles on the trailing edge of its tail (see photo).lethargic-dolphin-web-credit Tt-Xeno-flukes-web-credit