![A blue angel fish is nearly invisible against the live ivory tree coral Oculina.](https://webarchive.library.unt.edu/eot2008/20080916071548im_/http://www.nurp.noaa.gov/Images/Spotlight/deepseacorals_Oculina1.jpg)
Figure 1: Live Oculina varicosa,
the ivory tree coral, with Holocanthus bermudensis,
the blue angelfish. Photo credit: NURP/UNCW
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Twenty miles off the coast of Florida, stretching
from Daytona Beach down to Ft. Pierce, close to the edge of the
continental shelf, deep-water coral reefs of Oculina varicosa,
or the ivory tree coral (Figure 1), lie 150 to 300 feet beneath
the water’s surface. Oculina are quite unique, the only known
stand of their variety in the world. As such, in 1984, the South
Atlantic Fishery Management Council, under the advice and guidance
of NOAA
Fisheries, designated a 92-square-nautical-mile portion of these
reefs as the Oculina Habitat Area of Particular Concern (Oculina
HAPC). In 1994, the Oculina HAPC was closed to all manner
of bottom fishing and was designated as the Experimental Oculina
Research Reserve. In 2000, the area was expanded to 300-square-nautical-miles
and prohibited all gears that caused mechanical disruption to the
habitat.
Walk into a bait shop along the coast of Florida,
though, and odds are the fishing map you pull from the rack will
have little or no indication of the Oculina HAPC, no mention
of fishing restrictions and no acknowledgement of an area closed
to specific types of fishing. And that’s a problem.
It certainly doesn’t make John Reed’s job any easier.
Reed is a marine scientist with the Harbor Branch Oceanographic
Institution (HBOI) in Ft. Pierce, Florida. In spring of 2003, Reed
served as co-principal investigator on an eight-day expedition led
by NOAA's Undersea Research Program (NURP)
Center at the University of North Carolina at Wilmington, in
collaboration with NOAA Fisheries and the National Aeronautics and
Space Administration (NASA). The purpose of the mission was to learn
more about the Oculina reefs. Reed has been studying Oculina
for 25 years. It was he, in fact, who nominated the Oculina
reefs as an HAPC.
Oculina...“are like the redwood
forests. These reefs are thousands of years old. And there
are no others like them in the world.”
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The discovery
“When I was first out of graduate school,” says Reed,
“I was hired at HBOI, and this was just after they’d discovered
the deep-water Oculina reefs using a submersible. They had
come across one of these 60- to 100-foot-high deep-sea coral reefs.
“My first study, in 1976, was to see what lived in the coral, what
used it for habitat. I began to study the invertebrates, and what
I found out was that a small coral colony with a head the size of
a basketball could hold up to over 2,000 individual animals and
hundreds of species, including worms, crabs, shrimp and fish. It
was an incredible biologically diverse environment that we had never
known about before.
![Organisms use brown or dead Oculina as well as white living Oculina for habitat.](https://webarchive.library.unt.edu/eot2008/20080916071548im_/http://www.nurp.noaa.gov/Images/Spotlight/deepseacorals_Oculina2.jpg)
Figure 2: Whether dead (brown) or alive
(white) – Oculina serves as a high-relief habitat for
many organisms, including some commercially important fish
species. Photo credit: L. Horn, NURP/UNCW
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“By 1980, we realized that this was a totally unique
habitat found nowhere else in the continental United States. And
possibly nowhere else in the world (Figure 2).
“At the same time, I began to look at how fast the
coral grows. So my next study was to see how old the colonies’ heads
were. We were seeing coral heads the size of a Volkswagen Beetle.
I did a study over two years and found that they actually grow very
slowly, about a half an inch a year. So a large head could easily
be 100 to 200 years old. Then I did a coral core sample into one
of these reefs and determined the age of the dead coral that came
from the inside of the reef.”
What Reed and his colleagues learned by radiocarbon
dating the dead coral that came from the inside of the reef was
that the coral was around 10,000 to 12,000 years old, meaning it
began life near the end of the last Ice Age.
“We also came to realize,” Reed continues, “how fragile
the coral was: the branches themselves are the diameter of a pencil,
and the reefs form into big bushes. So imagine how any heavy weight,
like fishing gear, dragging through it could very easily crush it.
“At that time, in the early ‘80s, there was indication
that boats were coming down from the Georgia coast and up from the
Gulf of Mexico and fishing with roller trawls that were able to
fish over the bottom of high-relief areas. Roller trawls have wheels
that allow them to easily roll over the bottom of the ocean floor.”
These rare coral reefs, home to hundreds of species,
including commercially important fish, were being destroyed. Because
of their slow growth rates, it will take hundreds of years to restore
them, if they can be restored at all. “My main concern is that while
on paper this has been a protected area since 1984, they’ve still
been heavily fished,” both by poachers and by the unaware. “Tremendous
damage can be done by an errant shrimp trawler going across one
of these coral reefs. One pass can destroy a great many Oculina
corals.”
Inner-space trek
![Many small fish swim near a head of living Oculina coral.](https://webarchive.library.unt.edu/eot2008/20080916071548im_/http://www.nurp.noaa.gov/Images/Spotlight/deepseacorals_Oculina3.jpg)
Figure 3: Oculina coral head surrounded
by several fish. Photo credit: NURP/UNCW
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During the spring Oculina expedition, aboard
the NASA’s 176-foot ships Liberty Star and Freedom Star, Reed was
among a team of scientists, support personnel, and media types who
looked on as a camera mounted to a remotely operated vehicle (ROV)
documented in real-time the contours and conditions of the ocean
floor. The view afforded was a spectacular one – an inner space
every bit as exotic as images transmitted by NASA from the surface
of Mars. The Oculina reefs are home to many fish species,
such as red grouper, scamp, tattlers, yellowtail reef fish, bigeyes,
rough-tongue bass, amberjack and many more, including some species
that are of considerable economic importance to the South Atlantic
fishing industry (Figure 3). These fish species rely on the health
of the Oculina, and their association with deep-sea coral
has been long confirmed. For example: Oculina reefs have
traditionally been home to grouper spawning aggregations.
Primary among the objectives of the 2003 expedition
were to understand changes in the Oculina HAPC coral and
fish populations over the past twenty years and to establish a monitoring
baseline for future comparisons.
Evidence of coral destruction was at times overwhelming
– once rich thickets, rendered rubble, no fish in view; subterraneous
ghost towns (Figures 4 and 5).
![Telltale scars on the ocean floor from illegal shrimp and scallop dragging are visible in this photo taken by a submersible.](https://webarchive.library.unt.edu/eot2008/20080916071548im_/http://www.nurp.noaa.gov/Images/Spotlight/deepseacorals_Oculina4.jpg)
Figure 4: In 2001, seven years after the
area was closed to fishing, submersible studies showed that
rock shrimp and scallop dragging was continuing illegally
in the closed area. Photo credit: L. Horn, NURP/UNCW
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![A layer of broken dead coral rubble remains on the ocean floor many years after trawling.](https://webarchive.library.unt.edu/eot2008/20080916071548im_/http://www.nurp.noaa.gov/Images/Spotlight/deepseacorals_Oculina5.jpg)
Figure 5: Coral rubble is the likely result
of fishing gear trawling through Oculina coral reefs
over twenty-five years ago. Photo credit: L. Horn, NURP/UNCW
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However, there have been positive findings too. According
to the 2003 mission summary report, “Although fish populations observed
in 2001 were not directly comparable to those observed in 1995,
there was a noted increase in grouper numbers and size and especially
an increase in the abundance of males of gag and scamp [groupers],
suggesting the possible reoccurrence of spawning aggregations of
both species [within the Oculina HAPC].”
The 2003 cruise reported that, “Several live Oculina
thickets within the newly expanded [Oculina] HAPC were discovered
… and extensive live bottom areas (hard bottom with live benthos
and fish) were documented; we found that considerable portions of
[the Oculina] HAPC that appear relatively flat in the multi-beam
survey chart are actually live bottom.”
Increasing Awareness
In June of 2003 – after hearing testimony in a public
forum, during which more than a few local fishers spoke of the long-term
benefits of protecting the deep-sea coral, and, consequently, the
fish that rely upon the coral – the South Atlantic Fishery Management
Council voted to indefinitely extend the fishing restrictions within
the Oculina HAPC.
Support from the fishing industry is certainly an
encouraging sign. Fishers, managers and scientists together led
the charge to extend the Oculina HAPC closure after 2004.
As John Reed points out, protected areas mean little without public
awareness. More maps indicating the boundaries of the Oculina
HAPC would certainly help, as will a further understanding of the
importance of these reefs as habitat for important commercial fish
species.
Oculina, says Reed, “are like the redwood
forests. These reefs are thousands of years old. And there are no
others like them in the world.” This alone should make them worth
saving and restoring for future generations.
For more information on recent research concucted
on Oculina, see:
Oculina
2002 Mission
Oculina
2003 Mission
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