Posts Tagged ‘dorsal fin’

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

Fin whale, and “Onion” returns, Nov.16, 2015

Written by Tursiops. Posted in bottlenose dolphin photo ID, Cape Lookout Studies Program, Cetacean Studies, Marine Mammal Stranding Network, Sighting Report

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Today was an amazing day for the crew of Spyhop. The day started out with 2015’s first sighting of “Onion” here in Beaufort. While out for our regular bottlenose dolphin photo ID survey we encountered him  in the estuary near Phillips Island. He appears to be in good condition, and seems to be in the company of a new companion.

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We continued out to the ocean, as weather conditions were perfect. No other groups of bottlenose dolphins were seen off Shackleford banks. However, several blows from whales were visible in the distance. Heading back into Beaufort inlet we spotted a very unusual sight…A Fin whale (Balaenoptera physalus) just off of Atlantic Beach! This encounter is highly unusual as Fin whales are rarely sighted south of Hatteras in NC or near the beach in shallow water. While photographing this animal for documentation and possible photo identification we sighted a humpback whale, also very near the beach and a short distance away near the AB circle. Unfortunately we did not have the opportunity to photograph this animal. However, on our way back to the dock we encountered yet another humpback whale only slightly farther offshore of Ft Macon!

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Fin whale top left and right, Humpback whale below:
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Humpback Whale, Cape Lookout, NC, Nov 5, 2015

Written by Tursiops. Posted in Conservation, Sighting Report, Uncategorized

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The changing seasons bring new visitors to our waters here on the North Carolina Crystal Coast…

This time of year we anticipate sightings of our “winter” atlantic bottlenose dolphins arriving for their annual stay. Seldom do we encounter other species near shore, so the recent sighting of a humpback whale (Megaptera novaeangliae) was an unusual treat.

In the western North Atlantic ocean, humpback whales feed during spring, summer, and fall in a range that encompasses from western Greenland south to the mid Atlantic region of the eastern coast of the United States. Their preferred diet consists mainly of krill and small schooling fish species.

In winter, whales from the North West Atlantic migrate to subtropical/tropical waters to mate and calve. Not all whales migrate south every winter however, and significant numbers of animals are found in mid- and high-latitude regions at this time.

Similar to all baleen whales, adult humpback whale females are larger than adult males, reaching lengths of up to 60 feet (18 m). Their body coloration is primarily dark grey, but individuals have a variable amount of white on their pectoral fins and belly. This variation is so distinct that the pigmentation pattern on the undersides of their “flukes” is used to identify individual whales, similar to a human fingerprint. Other markings on the body and fins are useful for identification as well. One of the most distinguishing characteristics for this species is the “humped” dorsal fin for which the species is named.

Once hunted heavily to near extinction levels, populations of humpback whales are increasing and in recovery. The species is a true marine mammal conservation success story.

During our rather lengthy encounter with this animal we were fortunate to witness and record multiple events of “lunge feeding” on large schools of menhaden (another heavily exploited species that is showing signs of a population increase due to a ban on large scale targeted harvesting).

Through some of the photographs taken by the crew of “Spyhop” we have successfully matched this animal to other recent local sightings of north carolina whales, and hope to use them for further whale identification studies.

If you happen to sight a whale, please enjoy the experience in a cautious manner and at a safe distance (see NOAA guidelines). These animals are large, and though peaceful, direct encounters with boats can be dangerous for both humans and whales.

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