June 19, 2007
Sharks, rays thrive in Elkhorn Slough's muddy waters
Rabe of the Pelagic Shark Research Foundation wrestles a leopard shark
into a holding pen in Elkhorn Slough on Monday morning. A team of
researchers tagged, measured and took DNA samples from two dozen
sharkes before releasing them back into the slough. (Dan Coyro/Sentinel)|
LANDING - It seems an unlikely place to catch leopard sharks and bat
rays, but the smaller channels of Elkhorn Slough were crawling with
them Monday as the Earthwatch Institute teamed with the Pelagic Shark
Research Foundation to catch, tag, then release them back into the
two dozen fish were trapped inside the large and unwieldy nets in less
than three hours, all part of a long-term monitoring program designed
to further research while promoting species conservation in the shadows
of the Moss Landing power plant.
place is a mating factory," said Sean Van Sommeran, executive director
of the Santa Cruz-based research foundation. "We've caught a lot of
juveniles and pregnant females. We once saw a guitar fish give birth in
one of our holding pens a few years back, so we know that this place is
a critical reproductive habitat"
the muddy waters of Elkhorn Slough contain reproductive species is good
news. There was a time when the tidal wetlands were nothing but dry
ground, an expansive field used for grazing until the early 1980s, when
a concrete channel was built three miles from the Monterey Bay,
allowing in more water from the Pacific Ocean.
abundant were the sharks and rays afterward that archery contests were
held for years, featuring guys who would hunt the fish with bows and
arrows during low tide, awarding prizes to those who killed the most.
gamesmanship began to take its toll, however, and Van Sommeran, with
the help of other environmental groups, helped put a stop to the
killings in 1996.
slough is making a comeback. The tide is re-establishing itself," said
Van Sommeran, a 1981 graduate of Santa Cruz High School who's been
monitoring the slough with his small staff.
a bunch of volunteers who hold science degrees from various
universities and work odd jobs when they're not out in the slough,
setting up the nets and wrestling with the sort of fish that would
ordinarily scare the bejesus out of most folks.
Josh Leader, a park ranger at Loch Lomond in the Santa Cruz Mountains;
Andrea Rabe, a pro surfer and biochemist; Leon Chen, a recent graduate
of UC Santa Cruz and a former Google employee; and Katie Kent, a recent
graduate of Monterey Peninsula College.
the surface, the program may seem to come across as mere animal lovers
having a lot of fun and "Huckleberrying" around, Van Sommeran said.
Look beneath the surface, however, and what you've got is the epitome
of a "hands-on, outdoor science project" that has existed for more than
An amazing number of discoveries have been made - "and not the academic kind just for academic sake," he said.
starters, the tissues they collect from the fins of each fish are sent
to the U.S. Fish and Wildlife forensics lab in Oregon, which records
the DNA and has something to refer to for law enforcement purposes in
the event of an unlawful take.
if some leopard shark from the slough should show up in, say, the
middle of the ocean, the San Francisco Bay or off the Channel Islands
in Southern California, researchers have that on record, too.
But the research is much more than just keeping tabs on wayward migrations.
also about letting the general public know about certain things, like
how some of the leopard sharks in the slough have been found to have
heavy levels of contaminants due to pesticide use in the region - both
past and present, Van Sommeran said.
for some, it is fun to become one with nature, which is how the
Massachusetts-based Earthwatch Institute is helping fund part of this
year's shark population count. It recruited ordinary citizens to spend
more than a week with Van Sommeran and staff for $2,500 per person.
Jack and Debbie Eastburn, for example, came from Palo Alto to participate in Monday's event.
kind of feels like sandpaper or maybe skateboard tape," Jack Eastburn,
17, referring to the texture of the thornback ray, said after he
stepped on one the other day, then fished it from the net.
Weisman, a Chicago native, is another one, although she didn't pay for
the expedition out of her own pocket. She earned a fellowship.
needed to get over my fear of sharks," said Weisman, an urban planning
major at the University of Illinois at Urbana. "And this seemed like a
good place to do it"
Contact Tom Ragan at firstname.lastname@example.org.
Pelagic Shark Research FoundationWHERE: Based at Santa Cruz harbor.Founded: 1990.Mission: To conserve sharks and rays and educate the public. Contact: 459-9346 or www.pelagic.org
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