Eumetopias jubatus , The Northern Sealion : The Race Rocks taxonomy

Male, female and pup at Race Rocks .Sept 27,2011. Photo by Ryan Murphy

Male, female and pup at Race Rocks .Sept 27,2011. Photo by Ryan Murphy

Irmsept27mafeedpupn the fall of 2011, a female northern sea lion (Steller) and her pup appeared at Race Rocks. This is the first such pair that we have seen there. Link to Ryan Muphy’s Flickr site for a set of pictures of the sealions at Race Rocks. rmsept27maandpup2Ryan captured some excellent pictures but noted that due to blasting by the DND on the neighbouring Bentinck Island, the pup was injured and the mother disappeared. See below.. Commentary here is by Ryan Murphy : “Steller or Northern sea lions (Eumetopias jubatus) are the largest sea lion species in the world and are listed under Canada’s SARA (Species at Risk Act) as Special Concern.” rmsept27maandpup4“The Race Rocks archipelago south of Vancouver Island has long been a haul out for Steller sea lions, and we know from Lightkeeper Kurt Cehak’s accounts from the 60s that these marine mammals came to Race Rocks even when locals were encouraged to kill them to collect bounties. “ rmsept27maandpapup“Today, Steller sea lions are a year-round attraction for a multi-million dollar ecotour industry based in the Capital Region District of Victoria, BC. With the arrival of this pup and its mother to Race Rocks, the Ecological Reserve now protects the reproductive ecology of this threatened species.” rmsept27pup“However, this pup is at risk because of activities of the Canadian Department of National Defence. The island in the background is Bentinck Island and it is used by the Canadian military to dispose of ordinances and explosives training. Their rapid succession blasting during the last two days has caused rmsept27pup2repeated stampedes of sea lions and this pup may be crushed tomorrow.”     See the logs on this website posted by the ecoguardians which include mammal census and observations of sealions.           Northern Sea lion VIDEOS:

lionblasts dndblasts eye-1
EFFECTS OF DND BLASTING at Bentinck Island Sea lion disruption on middle island by DND blasting
Video Clips of Sea lions by Cam Wilson In October of 1998, Cam Wilson of Victoria made an Hi-8 video of Northern and California sea lions while diving off West Race Rocks. Clips are included here.
radiolion flasher2northern-1 RMdetail_20090823s
Tracking devices on sea lions This Northern Sea Lion was photographed with fishing equipment swallowed in September 2003..also see other photos of flashers and boat collisions. This link shows the conflict of motor boats and marine mammals in the reserve.

Posts on Entanglement of Sea lions in fishing gear

Domain Eukarya
Kingdom Animalia
Phylum Chordata
Sub Phylum Vertebrata
Class Mammalia
Order Carnivora
Family Otariidae
Genus Eumetopias (Gill, 1866)
Species jubatus (Schreber,1776)
Common Name Northern or Steller Sea Lion
climb

This sequence was taken in August 2008 by Pam Birley from the remote camera 5.

 

entangled2-1 rmmar09acipenser-1 tumor
Entanglement of a sealion on Middle rocks and video of release by Vancouver aquarium and DFO personnel White sturgeon images This is a link to the white sturgeon file where images taken by Ryan Murphy show predation by a Northern Sea lion on a white sturgeon at Race Rocks. In early November 2007, Mike Slater took this picture of a Northern Sea lion with a large tumor like growth on the side of its face. The animal was not sighted again at Race Rocks, however on August 22, 2009 it was photographed at Mittlenatch Island.
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Northern Sea lions peak in numbers in the fall. Branded Sea lions at Race Rocks :  Sea lions underwater, photo by PC Diver Natan.

This is the largest of the Otariidae or ‘eared seals’ family.

Habitat: Northern Sea Lions are found on North-Pacific coasts; in Russia, Alaska, Japan, Canada and the USA in particular. They spend most of their time on rocky shores and in coastal water. During bad weather they stay under water. At Race Rocks , the peak in numbers of these mammals is in October to January , upwards of 400 may be reported at Race Rocks. They mix freely with the Californian Sea Lion which may number well over 1000 individuals between October and February.

See the references on Sea Lions in our RREO Index

Description: The Sea Lions at Race Rocks are mainly bachelor bulls or juvenile yearlings. Since this is not a breeding colony, mature females do not usually come here. There are clear differences between males and females. The males are larger in size and weigh more. Whereas the average sea lion male weighs 566 kg (1,245 pounds) the average female weights only 263 kg (579 pounds). Moreover, the average male has a body length of 288 cm (10 2/3 feet) while the average female has a body length of 228 cm (8 2/3 feet). Most females are yellowish or creamed color and most males are dark.
The average life span of a Steller sea lion is about 20 years for males and old females can even reach 30 years. The breeding season is between May-June and each mating produces a single pup.p10graphSteller sea lions are marine carnivores. They feed on wild fish (salmon, herring, rockfish, flounder, and Pollock) as well as on invertebrates such as squid and octopus. The Steller sea lions feed at night, usually about 15-20 km. from shore. This relatively selective diet is one of the causes of the sea lions’ decreasing numbers since they compete with humans for this food.

An Eastern Alaskan population is now on the endangered species list due to severe declines in numbers over the past decade. They are now a threatened species included in the ‘Red List’ and protected in the USA and by the Commonwealth Independent States ( CIS).

Although they dive and spent s lot of time under water, Northern Sea Lions are also known for their ‘sunbaths’ and are often watched catching sunlight on the rocky shores. Male Northern Sea Lions are generally aggressive and territorial.

References cited Dec. 2001.
http://www.wc.adfg.state.ak.us/index.cfm?adfg=wildlife_news.view_article&issue_id=40&articles_id=229

See also:

The stellar sea lion: Two distinct stocks, Thomas Louglin, NMML

Other Members of the Class Mammalia at Race Rocks.

taxonomyiconReturn to the Race Rocks Taxonomy
and Image File
pearsonlogo2_f2The Race Rocks taxonomy is a collaborative venture originally started with the Biology and Environmental Systems students of Lester Pearson College UWC. It now also has contributions added by Faculty, Staff, Volunteers and Observers on the remote control webcams.
Dec 2001-Nufar.

 

Acipenser transmontanus: white sturgeon

In this amazing picture, Ryan captured the spray of blood from the sturgeon as the northern sealion takes a bite. This is a first record we have for sturgeon in the Race Rocks Ecological Reserve. These images were taken by Ryan Murphy on the evening of March 2, 2009.

See Ryan’s Flickr site:

For confirmation of the identity of this fish, we contacted Lisa Spaven of DFO in Nanaimo and she helped us get in touch with a number of Canadian and American specialists in Sturgeon. There were some initial considerations that it may be a Green Sturgeoon but as the following conversation indicates, they have settled on the White Sturgeon:

Mar 06,2009,
From Chris Wood:
Conservation Biology Section
Science Branch, Fisheries and Oceans Canada Pacific Biological Station:
Hi Troy
White or green?

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Mar 08,2009
From Troy Nelson: Director of Science
Fraser River Sturgeon Conservation Society
” I have looked at the pics of the sturgeon at Race Rocks and think it
may indeed be a white. Although darker/tinted coloration is present, I think this may be partially caused by the low sun and color of the sunset (see the pinks in the water behind the fish in the last pic).Most notable is the lack of a dark stripe on the bottom side of the sturgeon, anterior of the pectoral fins.  There is one shot of the bottom of the sturgeon and this section looks devoid of any dark stripe.I have attached pics of a confrimed green sturgeon (from the Albion Test Fishery); note the dark stipe that ends in an “arrowhead” shape on underside of the upper body. I have copied Olaf Langness (WA DFW) who works with green sturgeon; he may be able to confirm if the Race Rocks sturgeon is a green (or white) in 10 seconds or less”.

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March 9, 2009
From Chris Wood

“Thanks Troy, I was expecting it to be a green sturgeon in that location, but in one
picture, there seemed to be a (too?)close spacing of lateral scutes
between the pelvic and anal fin. We’ll see what Olaf says”…

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March 9, 2009
Olaf Langness Fisheries Biologist (Washigton State Department of Fish and Wildlife)
Thanks Troy for sending this to me.
I would say your assessment is correct.  I think the Race Rock sturgeon was a white sturgeon.  Besides your comments about the lack of a belly stripe, I also think the lateral scutes look small and plentiful, more that of white sturgeon than green sturgeon.  As to the pink coloration, I agree that some of that may be the result of time of day when the photo was taken, but also would not be unusual for a sturgeon under stress to pink up on the lighter belly area, and even to darken slightly on top.  Furthermore, there are way more white sturgeon identified in the surrounding waters of Race Rocks (off southern tip of Vancouver Island, in the Straits of Juan de Fuca) than green sturgeon, based on tagging studies and commercial or recreational landing reports. As you know, white sturgeon are being attacked this time of year, just below Bonneville Dam on the Columbia River.  Many of these fish are mature adults, taken by large Steller  (Northern)  Sea Lions.  The more prevalent California Sea Lions are smaller than the Stellers, so they tend to go after salmon and mostly leave the sturgeon alone. While we have been authorized to kill up to 85 California Sea Lions a year, the Steller Sea Lion is listed under our Endangered Species Act. So our marine mammal hazement program is  focused on reducing predation on spring chinook salmon, and limited on what can be done to control the predation on sturgeon.  This is of great concern to sturgeon managers in Washington and Oregon, especially due to the sea lions targeting of the spawning broodstock .”

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March 9,2009
Chris C. Wood


Species transmontanus
Common Name: White sturgeon
Pacific White Sturgeon

Domain Eukarya
Kingdom Animalia
Phylum Chordata
Subphylum Vertebrata
Class Actinopterygii
Order Acipenseriformes
Suborder Acipenseroidei
Family Acipenseridae
Subfamily Acipenserinae
Genus Acipenser
Species transmontanus

 

 

 

 

 

 

 

taxonomyiconReturn to the Race Rocks Taxonomy
and Image File
pearsonlogo2_f2The Race Rocks taxonomy is a collaborative venture originally started with the Biology and Environmental Systems students of Lester Pearson College UWC. It now also has contributions added by Faculty, Staff, Volunteers and Observers on the remote control webcams. March 2 2009- Ryan Murphy