9/29/14

#21: The Lone Sea Wolf

The Nereid crew had been waiting patiently for another good weather window to survey the Bay of Fundy, and luckily September 26 held light winds and no fog for us. As we made our way into the Bay, we occasionally stopped and turned off the boat for a listening station, which allows us to hear distant whale blows. Though we heard and saw humpbacks on the horizon, we did not hear or see any right whales. During one listening station, Monica noticed some dolphins splashing around, and with her binoculars she realized that there were dolphins as far as the binoculars could see!


White-sided dolphins being very active. Photo: Marianna Hagbloom

To determine species and estimate the group size (and to have some fun!), we decided to get a closer look. These were Atlantic white-sided dolphins, and we estimated this pod was composed of 400 individuals!


A great look at the identifying markings of a white-sided dolphin. Photo: Monica Zani

We were amused by their huge leaps out of the water and by the flurry of activity that would occur when chasing fish. We also caught glimpses of several mothers with calves, which evoked some "awww!"s from our otherwise very professional observers.

Not too long after continuing on our trackline, the observers on the bow called back that they were seeing something that looked like a lobe of a right whale fluke sticking out of the water. As soon as we got a better look through our binoculars, we realized we were looking at an orca! For many of us, this was the first time we'd ever seen an orca in the Bay of Fundy, and for some of us, this was our first orca sighting ever, so you can imagine the excitement on the Nereid!


Surfacing! Photo: Johanna Anderson

We stayed with the orca for a few dive cycles, and got close enough to get some great photographs of his remarkably tall dorsal fin. We used the images to compare this orca with the orca that was seen by our team in the Bay of Fundy in 2012- and it turns out that this is the same whale, fondly known to our team as "Old Thom." Although this killer whale had been seen in 2012, sightings of this species in the Bay of Fundy are very rare- CBC News even chose to write an article about it!


Our "Old Thom" was seen in the Bay of Fundy in 2012. Photo: Johanna Anderson

Rounding out our survey day was a sighting of a trio of humpback whales. One of the humpbacks was "Foggy," who was disentangled from fishing gear by the Campobello Whale Rescue Team last September. It was wonderful to see this whale survived the incident and had returned to the Bay of Fundy.


Foggy at the surface. Photo: Kari Signor

9/21/14

#20: Another Entangled Whale in the Bay

As the Shelagh was returning to home port from our second Roseway Basin voyage, we sighted a right whale in the Bay of Fundy. Even from a distance, we could tell that the blowholes had been injured at some point because the post-blowhole callosity and surrounding area was overwhelmed with cyamids, and the whale was not creating the signature V-shape blow when it exhaled. As soon as we got a closer look, we saw green line tightly crossing the head, similar to the entangled whale #4001 that the Nereid team found on September 5- but unfortunately, these individuals were not the same whale. This whale has been identified as Catalog #3279, a 12 year-old male.


Catalog #3279 with a tight head wrap cutting through the nares. Photo: Kari Signor

Our team could not attempt to disentangle him, and it was too late in the day to dispatch the Campobello Whale Rescue Team. Though we ached to do more for this whale, the best we could do was document the case as thoroughly as possible.


Orange cyamids covering raw wounds on the peduncle. Photo: Johanna Anderson

This is a terrible type of entanglement and we are eager to survey the Bay in the hopes of relocating #3279, but the weather has been uncooperative thus far. So we wait on land, frustrated at the weather and frustrated that yet another individual has to suffer the same fate as 83% of the right whale population.

-Marianna

9/19/14

#19: Flukes, Flukes and more Flukes


If you an avid reader of our blog then you likely know that we are able to individually identify right whales by using the unique callosity pattern found on the top of their head.  However, in some whale species it's the ventral side of the tail fluke that is used for individual identification. 

Example 1: The Sperm Whale

Image of a sperm whale taken in 2011
Photo: New England Aquarium





Look at the ventral fluke of this sperm whale.  By using both the shape of the wavy trailing edge of the fluke and the small white/yellowish scar on the right tip we are able to determine that we have seen this individual in 2011, 2013 and this past August (2014).

This 2013 photo shows the same wavy trailing edge and the distinct white/yellowish  scar on
the right ventral fluke tip.  
Photo: New England Aquarium
The now familiar fluke was photographed in August 2014 by Liz Burgess aboard the R/V Callisto.



Example 2: The Humpback Whale:
Humpback whales have a distinct pattern of pigmentation on their ventral fluke. The fluke can range from all white to all black.
This humpback whale is named "shark" for the shark-like head on the right ventral fluke. Can you see the shark face?
Photo: Liz Burgess/New England Aquarium

"Shuttle" (see the space shuttle on the right fluke) is another humpback photographed by Liz Burgess as she and the R/V Callisto crew surveyed Grand Manan Banks last week.

*A special thank you to Allison Glass Henry and Brigid McKenna for humpback IDs.

Monica 










9/16/14

#18: A Feeling of Emptiness

We had a stretch of good weather forecast for last Sunday, Monday and Tuesday.  We were all excited for multiple boats on the water, good weather, long days, and lots of whales.  On Sunday we surveyed the western side of  the Grand Manan Basin with the  R/V Nereid.  On Monday, both the R/V Nereid and the R/V Selkie were on the water and completed an extensive survey of the basin in excellent sighting conditions.  Teams on both boats did get the opportunity to see a sperm whale  and a large (200 plus) pod of Atlantic White-Sided Dolphins. On Tuesday the R/V Callisto joined the survey effort and between all three teams we searched far and wide for right whales.  The Callisto crew and Selkie  crew went south of Grand Manan to an area called Grand Manan Banks. The Nereid surveyed far north and east (beyond the Bay of Fundy shipping lanes).  While the two boat teams on Grand Manan Banks sighted great numbers of humpback whales (30+) the Nereid team was faced with an almost empty feeling Bay of Fundy.  However, the crew was treated to an exciting sighting of approximately 30 white-beaked dolphins.

White-Beaked Dolphins swimming of the bow of the R/V Nereid were the highlight of our survey effort last week.
 Photo: Monica Zani/New England Aquarium


Update on our offshore team: The Shelagh and the offshore crew were tied up for a couple of days in Yarmouth, Nova Scotia  but departed Yarmouth in the early morning hours of Wednesday.  They surveyed Roseway in a 3-6 foot rolling ground swell and reported no large whales of any kind.  They will continue survey effort through Thursday (I will report details of that survey soon) and then head to Cape Sable Island for fuel and rest.  The weekend looks unfavorable for any survey effort both in the Bay of Fundy and offshore on Roseway Basin.

Monica

9/11/14

#17: Two New Entanglement Cases

On September 5th, the Nereid crew sighted an entangled 4 year old male, #4001, 2010 calf of Aphrodite, #1701. This animal had a single wrap of heavy rope over the top of the head and through the mouth. No trailing gear was detected (although the higher sea state precluded a careful look) and it is not known if the flippers are also entangled.

The Campobello Whale Rescue Team was notified and came out to the location but despite a lot of searching, relocation of this animal after it dove proved challenging - all the animals seen that day were on long dives and travelling far distances. Therefore, no disentanglement efforts were carried out. And this animal has not been seen since despite a lot of survey effort in the Bay.


#4001 sighted entangled in the Bay of Fundy
We are concerned about the fate of this animal as at only 4 years old, he is still growing and the line could become embedded and potentially lethal, a pattern we have seen with other right whales with rostrum wraps. To top off this unfortunate news, we learned that on September 4th, a Canadian patrol aircraft sighted a dead, entangled right whale south of Newfoundland well offshore and unable to be retrieved. The carcass was fairly decomposed and will probably not be able to be matched to the catalog.


Both of these events highlight the fact that entanglements are now the biggest concern for this small population (vessel strikes have been much reduced due to effective regulations - see paper link below). These two entanglement cases are the tip of the iceberg for this species - we know that 83% of the population has evidence of entanglement interaction based on scars and many of these animals have been entangled more than once (two animals as many as seven times!). We also know that injuries have become more severe in recent years perhaps a result of changes in fishing distribution and an increase in rope strength. There are likely many more right whales dying from entanglement than are documented and these events occur all along the eastern seaboard where ever fixed fishing gear occurs. There clearly is much more work to be done to better understand and find ways to mitigate entanglements to help this species endure.

To read more about entanglements and vessel strikes, here are two papers that NEAq team members have been involved in:

Entanglements
http://www.int-res.com/abstracts/meps/v466/p293-302/

Ship strikes
http://www.int-res.com/abstracts/esr/v23/n2/p133-147/