White Sharks |
New Years Point and its associated island were first discovered by
westerners on New Year's day 1603.
Spanish Naval Captain Sebastian Viscaino named the point "Punta Del Ano
Nuevo" and noted that the low rocky point was infested with wild sea
creatures. Centuries later the site has become a state park and
wildlife refuge. The often-treacherous channel between the island and the
mainland is nearly a mile wide and must be traversed by researchers and rangers
in an inflatable zodiac w/ outboard. The island is off limits to the public
because of its sensitivity. In 1906 the United States Coast Guard
established a lighthouse and station in hopes of remedying the numerous
shipwrecks that became peculiar to the area.
During the Second World War the island was modestly fortified and was
used as a naval observations post. Some years after the war a new lighthouse
was established at Pigeon Point and the facility on Ano Nuevo Island was
abandoned as too costly to maintain. There had been nearly a dozen
fatalities in and around the island's channel through the course of the
facilities 50 or so years of operations. In the early 1970's UCSC
Professor Burney Le Boeuf established a research station among the ruins
of the old Coast Guard facility. Long known as an area frequented by large
sharks the white shark research project began in earnest during the fall
of
1992.
Van Sommeran/PSRF
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Shark Station Zebra: Ano Nuevo Island is the base of operations for the
white shark study. Shark researchers share the island with marine bird and
mammal researchers. Professor Le Boeuf established a research station among
the ruins of the old abandoned U.S. Coast Guard facility in the early
1970's. The white shark project began in 1992 and coordinates efforts
between island and vessel-borne operations. The island is an extremely
sensitive site as many elusive species of marine birds and pinnipeds have
returned to the island. Because of this sensitivity and abundance the
island is off limits to the public. The island presents an ideal field lab.
Van Sommeran/PSRF
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Another aerial recon photo of Ano Nuevo Island.
Van Sommeran/PSRF
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In this Aerial recon shot the camera is pointed NNW facing the islands
south-end. The 2-story mansion stands alone on area 1, in the photo's lower
foreground. The south side of the large tan colored foghorn building stands
out in the photo's upper left and the much smaller tan colored cement
bunker can be seen with its door open. The circular cistern turret is
partially obscured by dunes and brush. A tall pole stands just to the right
of the island's high ground. At the base of the pole are the remnants of
the collapsed lighthouse beacon. To the right is the shoreward side of the
island and the channel. To the left of the island, where the large tan
building is (projects base station) is the western side of the island and
the open sea.
The white shark observatory study began in the late summer of 1992. PSRF
staff has since then tagged over 20 white sharks including 5 with
transmitters, have documented a number of feeding events and ID'd numerous
individual white sharks. Efficient coordination between island base and the
vessel operations took some practice, as there is no way to deploy from the
island itself. In order put researchers on the island, an inflatable Zodiac
is used. Researchers must don wet suits and crash helmets for the
often-perilous surf landing across the mile wide channel between the point
and the island. Under some conditions surf kayaks are used. The research
boat (23' ft Chris Craft, 25' ft Whaler) must motor 25 miles up the coast
to the island, which can take over an hour. This trip can be hectic during
the stormy months of winter. Since 1900 there have been over a dozen
fatalities within the channel due to shipwrecks and hazardous surf
conditions. All PSRF A-team members (Ano Nuevo Team) are drown proofed,
dive master, surf rescue qualified and aggro. All A-team members must meet
or exceed all U.S. Navy SEALS readiness standards and qualifications.
A-team personnel are well trained, capable and efficient, completely
organized and without problems. Their motto? " Who Dares, Wins."
Scot Davis/PSRF Winter 1997.
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In this PSRF recon photo of the old U.S. Coast Guard base, the camera is
pointed to the ENE, facing the seaward shore of the Island. Clearly seen in
this photo is the concrete western wall ringing the large tan colored fog
horn building which houses the base station and Island crew quarters. Also
shown is the concrete bunker and cistern turret. The smaller bunker to the
left of the larger building and turret serves as the main radio room and
kitchen facility. The station is powered by a diesel generator housed in
the fog building. To the right of the base station and turret can be seen
the abandoned 2 story mansion that once was home to coast guard and naval
personnel. The once beautiful mansion is now inhabited with seabirds and
sealions. The cistern turret is also out of commission. Researchers and
park staff restrict their movements to narrow walking paths that
criss-cross the island as to avoid the most sensitive areas of bird nesting
areas such as auklet burrows. There are numerous observation blinds and
sneak paths for monitoring the island's beaches and seal haul-outs.
Scot Davis/PSRF Winter 1997.
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Looking west from Point Ano Nuevo across the channel to the abandoned
Coast Guard mansion on Ano Nuevo Island's southern point. The area is a wildlife reserve and
state park.
Casper/PSRF
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Looking east at Ano Nuevo Island's western seaward shore. The channel is
on the other side of the island. This is the view of the island that the research boat has much of the
time while awaiting predatory events. The dark colored mansion is on the
right of the island, The fog horn building is the light colored building in
the right center of the island and the light tan colored bunker can be seen
to the left of the fog horn building.
Van Sommeran/PSRF
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The abandoned Coast Guard mansion.
On the island, facing to the northeast one can view the island's
southwestern shore. The lighthouse keeper's mansion was abandoned to the
sealions and marine birds after a new lighthouse was built at Pigeon
Point
during the late 50's. A research station has been established within the
old USCG facility's fog-horn building and cement bunker which was more
able
to withstand the rigors exposure. A well-weathered study blind can be
seen
on the cliff ledge to the left. Form this blind researchers can observe
the
behaviors of the islands marine birds and pinnipeds.
Casper/PSRF
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An adult bull northern elephant seal of about 2 tons catches some sleep
in between bouts of brawling with rival males. The bull elephant seals
fight for dominance over the harems of females that cover the islands small
beaches. The northern elephant seal is the deepest diving of all marine
mammals, rivaled only by the massive sperm whale both species can dive
down to depths of 5000 feet. Elephant seals live most of their lives on the
open ocean often feeding on deepwater squid. It is unknown whether or
not white sharks follow the elephant seal migrations or rather intercept
them at the rookeries and haul-outs like Ano Nuevo Island and the Farallons.
Casper/PSRF
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An inflatable UCSC zodiac w/ a 15 horse outboard is used to transfer
supplies and personnel to and from the island. The channel can be
treacherous during the winter months and skiffs have been over-turned.
Wet suits are required on even calm days. In the foreground a sub adult bull
carries the scars of an encounter with T-Rex. While bull elephant seals
are extremely tough and do not go quietly when attacked, even alpha bulls
are a potential target for the worlds largest known predatory shark, the white
shark, C. carcharias. (T-Rex). Part of the island based shark
researcher's daily routine is to survey all the island's beaches and haul outs for
evidence of shark bites on pinnipeds.
Casper/PSRF
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S. Van Sommeran stands on the island's high ground while standing the
morning watch. Researchers on the island communicate via VHF marine
radio and cell phone with a research boat that orbits the island's seaward
side, drifting lures and keeping a sharp look out for predatory events. At
each tide change a survey of the island's beaches and haul-outs are conducted
to record the occurrences and locations of bitten pinnipeds. A typical
island crew consists of 2 to 4 researchers who stay on the island for 3 to 5
days. The research station has a diesel generator in the old fog horn building
that provides electricity to light the compound and support a kitchen
facility, which is located in the old concrete bunker. The research boat
"Pelagic 1" can be seen on the horizon to the extreme left of the photo
just above the crumbling wall. A VHF marine radio antenna can see seen
sticking up from the roof of the concrete bunker at the right of the
photo.
Styllos/PSRF
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This fortunate California sealion was able to escape an attacking white
shark and live to bark about it.
While its rudders and tail section were badly shot up, the sealion had
no major structural damage and was able to recover from his wounds.
Van Sommeran/PSRF
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At the change of every tide a member of the island crew surveys all the
islands beaches and haul-outs for bitten and dead pinnipeds or other
evidence of shark activity. This unfortunate California sealion was
badly
bitten by a white shark. The sealion's body cavity was breached and its
vital organs were exposed when it worked its self up the beach where it
expired after 5 days. It is not unusual to find parts of partially
consumed
pinnipeds washed ashore during periods of heavy shark predation.
Kochly/PSRF
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A badly shark bitten California sealion (Z. californicus) rests on the
rocks of the islands western seaward shore. By the next day the sealion had
expired. A good indicator for the presence of white sharks around the
island is the occurrences of bitten, mauled, and otherwise predator damaged
marine mammals that come ashore. There is a marked increase in these kinds
of events during the fall and early winter. Seals and sealions are
themselves, remarkably alert and vigorous predators that are often able to
fight their way out or evade a pursuing shark. The heavy scars on most of
the sharks indicate the ferocity with which the two species engage in. To
find a terrestrial (on land) equivalent of a white shark, you would have to
consider a predator that would routinely prey upon grizzly bears (Ursus
arctos) and timber wolves (Canis lupus). Please forgive the marine to
terrestrial analogy, northern elephants are actually much larger than Griz.
Scot Davis/PSRF Winter 1997.
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UCSC field biologist Patricia Morris conducts a seasonal census of elephant
seals on Beach 17, on the islands eastern landward shore. Ano Nuevo Island
and its adjoining point represent the worlds largest mainland elephant seal
rookery. The Island and associated point are a state wildlife reserve and
its surrounding waters are federally protected by the jurisdiction of the
Monterey Bay and Gulf of the Farallons National Marine Sanctuary. The bull
elephant seal challenging pat to a duel weighs over two tons.
Fritz-Cope/PSRF Oct 1997.
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California sealions (zalophus) body surf in the channel between the
island
and the mainland.
Hein/PSRF
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Stellar sealions are almost three times the size of California sealions.
These female Stellar's are very valuable because they are breeders for
an endangered species.
Hein/PSRF
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Harbor seals are relatives of the elephant seal, (Phocids). Like the
elephant seal, the harbor seal is a diver propelling itself with its
hind flippers whereas sealions like the California and Stellar's sealions
propel themselves with powerful strokes of the fore flippers, (Otarids). Harbor
seals can out dive sealions and can dive as deep as 1500 feet. White
sharks are known to consume them all.
Casper/PSRF
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Ano Nuevo Island is the seasonal home to numerous species of rare and
endangered marine birds and pinnipeds. Researchers with UCSC and PRBO
study auklets, cormorants, pelicans, and other marine birds, which use the
island for nesting or shelter.
Hein/PSRF
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Research vessel crew, from left to right, Dr. Dave Casper, Sean Van
Sommeran and Ross Hein wait out their watch while aboard the "Pelagic 1"
(PSRF research boat) during a long uneventful rainy day December of
1995.
1995 was the first year that PSRF began to approach predatory events and
during the course of that season they were able to tag 12 white sharks,
(a national record). Many an uneventful day is spent by the crew with
nothing to do but watch the wind blow. Fall of 1996.
Casper/PSRF
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In the above photo the view is toward the southeast. In the upper left
side of the photo the island and the northwest side of the island's base
station can be seen. The tan building is the old "fog horn building" where the
research team resides. The shark pictured here is an adult female white
shark of approx. 15 feet long. A large orange ball buoy has been
attached to the flat surface decoy as a visual marker. Large swells can make
observing a distant decoy difficult, a buoy makes it easier to visually
track.
Casper/PSRF December 1995
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Surface lures in the shape of e-seals are used to draw the sharks to the
surface in order to photograph and tape the sharks for ID purposes and
to attach transmitters and tags. The surface lure, or target, as it is
sometimes referred to, is painted brown on the bottom and white on the
top. The surface shape is drifted away from the boat at a discrete distance
and watched closely. Oct 1997.
Scott Davis/PSRF
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As the surface target drifts over certain areas, sharks will often make
a pass at the lure or may actually strike a target. The average life-span
of a white shark surface decoy at Ano Nuevo is not very long and must
typically be replaced within a season or two at most, Oct 1997.
Scott Davis/PSRF
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In this photo, a large 18' foot long white shark can be seen as it grabs
a 6 foot long surface lure in its mouth and briefly carries it. The shark
has a distinctive notch on the trailing edge of the dorsal fin.
A second target (8-footer) can be seen floating to the left of the
screen. The surface decoys or "targets" are painted white on the surface side
and brown (like a seal) on the bottom side.
Dec 1996. Fritz-Cope/PSRF
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A 1200 lb. sub adult female white shark is fended off of the boats
outdrive as it makes a fast pass at the stern of "Pelagic 1". January 17, 1997.
The shark was drawn to the surface with the surface lure and the shark then
took a brief interest in the boats outdrive.
Scott Davis/PSRF
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Taking photos of white shark heads are useful for ID purposes. Scars and identifying features can be clearly seen on the head of this 18' ft white shark that was tagged during the winter of 1995-96 at Ano Nuevo Island.
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We use photos of dorsal and caudal
fins to identify individual white sharks.
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A white shark is tagged on the left side of the dorsal with a Dept of Fish and Game tag aboard the 'Pelagic I' off of Ano Nuevo island. 1995-96 season.
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A transmitter mounted on a lance is poised by Van Sommeran just prior to
application, Oct 15, 1997. Five white sharks and three northern elephant
seals were attached with sonic transmitters between Oct 13th and Oct 26th
1997. The transmitters are of Vemco design manufactured by PSRF staff at Dr
Klimley's lab at UCD Bodega Bay Marine Lab. Dr A. Peter Klimley and Dr
Burney Le Boeuf are the world's foremost authorities on the ethology and
behavior of white sharks and northern elephant seals. The tracking system
recently employed with much success at Ano Nuevo was previously used by
Klimley to great effect in Hawaii with tunas. Le Boeuf is best known for
his incredibly detailed and hi-tech trackings of both male and female N.
elephant seals.
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Chief Science officer and UCSC senior grad student Scot Davis
mans the Ducane hydrophone/head set in order to monitor the area for the approach of
any of the 5 transmittered white sharks that were tagged during the 1997-98 field study.
The transmittered sharks are also tracked and plotted remotely via an automated system
involving an array of sona-buoys and radio signals thru a computer timer-interphase and
stored to discette on the island's base computer, (Kilmley/Le Boeuf) which also plots the
sharks live in real time. This new system has an amazing potential and the project is
being developed accordingly.
C. Fritz-Cope/PSRF Nov 1997.
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In this simplistic chart we see the two different strategies believed to
be employed by white sharks to prey upon seals and sealions. White sharks
are known to hunt both types of pinnipeds. Sealions belong to the group of
pinnipeds called Otarids and seals to the group called Phocids. Otarids
are often referred to as "eared seals" and Phocids as "ear-less seals".
Sealions use their fore-flippers to propel themselves through the water
and typically travel along the surface, often porpoise'ing. Seals on the
other hand, propel themselves with their hind-flippers and typically travel
along the bottom while only surfacing to resporate between dives. Elephant
seals and harbor seals are both Phocids who are capable of diving to great
depths. The harbor seal can dive to over 1500 feet. The northern
elephant seal can dive to 5000 feet. Wild California sealions can dive to
350-400 feet tops.
Klimely/PSRF
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A dead sub-adult female northern elephant seal is secured with a pole gaff.
The seal was observed to float to the surface not far from the island by
Callaghan Fritz-Cope who was on watch in the base station's high blind, Oct
13th 1997. Fritz-Cope alerted Van Sommeran and Davis who were nearby aboard
the vessel "Pelagic 1". Upon arriving at the kill, the boat carefully
approached the dead seal where Davis took this photo. By using the kill
site as a natural "bait station", the crew of the Pelagic 1 succeeded in
attaching 3 sharks with transmitters in under an hour. Extreme caution and
reverance should be excercised when approaching any large feeding predator.
White sharks are a protected species in California and only researchers
with proper state and federal permits are allowed to pursue or disturb
white sharks in any way, for obvious reasons.
Sccot Davis/PSRF Oct 1997.
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A stricken elephant seal struggles at the surface as a large shark bites
it
below the turbulent surface.
Oct 1995. Dave Casper/PSRF
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A white shark surfaces in a pool of blood as it feeds on a hemorrhaging
elephant seal at Ano Nuevo State Park. On the left of the sharks
departing dorsal fin a yellow Dept of Fish and Game tag can be seen.
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The aftermath of a recent white
shark kill (elephant seal).
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In this shot a large female white shark surfaces and vigorously gorges
itself on the carcass of a sub adult male northern elephant seal.
Oct 31, 1995. Dave Casper/PSRF
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An immense 4-5000 lb female white shark approaches the remnents of a 500 lb
elephant seal during a predatory event in late October 1997. The shot was
snapped by PSRF staff photographer Callaghan Fritz-Cope as he leaned over
board as the shark approached.
Fritz-Cope/PSRF Oct 1997.
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A heavily battle scarred white shark cruises within range of Fritz-Cope's
SLR. Late Oct 1997.
Fritz-Cope/PSRF
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In this shot we can view a robust adult female with what appears to be a
shark induced scar on its gill vents. This type of scarring is almost
certainly related to mating behavior. While the scars did not appear to be
fresh and were well healed, they probably were not much more than several
months old.
Fritz-Cope/PSRF Oct 1997.
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An extremely large 19+ foot long 5000 lb feamle white shark with mating
scars over the gills. The scars appear to be healing over only some weeks
or months old. It would be easy to speculate that the animal depicted is
potentially gravid. There is little, to no information at all known about
white shark breeding areas or pupping grounds.
Fritz-Cope/PSRF Oct 1997.
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Approaching a feeding white shark is a potentially dangerous undertaking and should not be attempted at home. White sharks are a protected species in CA waters and it is illegal to hunt for, fish for, or otherwise pursue white sharks in the state waters of California without a CDFG research permit. If you are boating and happen to cross paths with a feeding white shark it is advisable to stay at least 100' ft away. White sharks have been known to attack small boats when provoked.
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A large white shark bites down on the outdrive of our research boat after encroaching on a feeding event near Ano Nuevo Island. winter 1995-96.
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While sportfishing for king salmon near Ano Nuevo Island in 1991 we had a white shark following the boat and biting our fish off. We lost 1 1/2 salmon to the shark, this was our allowance of salmon that the shark left us with for the day.
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Director Sean Van Sommeran pats one of the five sharks that he tagged with
transmitters during the course of the 1997-98 study season. Scott Davis,
Callaghan Firtz-Cope, Casper and Van Sommeran also tagged an number of
other sharks with number coded Floy tags during the same period.
Fritz-Cope/PSRF Oct 1997.
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White Shark, Ano Nuevo Island, Winter 96/97
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