RECENT STUDY OFF CAPE
CANAVERAL SHOWS GREATER ABUNDANCE, BIOLOGICAL DIVERSITY AND SIZES
OF FISH
IN PROTECTED AREAS
NOAA Fisheries and U.S. Geological Survey
scientists recently completed a study on the effects of a 40
square kilometer no fishing area on fish populations near Cape
Canaveral, Florida. Despite a growing interest in establishing
permanent 'no-take' reserves for conservation purposes, such
actions have been controversial because of a lack of examples
and long-term studies.
The objective of this study was to compare abundance, size, distribution,
and movement of adult-sized sport and commercial fish species
between the areas closed and open to fishing. The results of
this study have been published in a article entitled "The
Effectiveness of an Existing Estuarine No-take Fish Sanctuary
Within the Kennedy Space Center, Florida." The authors,
Darlene R. Johnson and James A. Bohnsack of NOAA Fisheries and
Nicholas A. Funicelli of the USGS,
examined fish populations inside and outside of no-take zones
established for security operations at the Kennedy Space Center.
"Approximately 22 percent of the waters of the Merritt
Island National Wildlife Refuge, which encompasses the Kennedy
Space Center, have been closed to public access and fishing since
1962," said Bohnsack. "This protected area is one of
the oldest and largest no-fishing zones in North America and
offered a unique opportunity to test the effectiveness of no-take
sanctuaries."
From November 1986 to January 1990 the research team sampled
fishes in areas open and closed to fishing using 653 random trammel
net sets, each enclosing 3,717 square meters. Team members measured
and weighed then tagged and released all the fish of five selected
species that were entrapped in the nets. Samples from no fishing
areas had significantly greater abundance and larger fishes than
fished areas. Relative abundance in protected areas was 2.4 times
greater than the fished areas for total gamefish, 2.4 times greater
for spotted seatrout, 6.3 times higher for red drum, 12.8. times
higher for black drum, 5.3 times higher for common snook, and
2.6 times higher for striped mullet.
Throughout the study, the team carefully
monitored seasonal variations as well as variations in water
salinity, depth and temperature. The team found that, independent
of habitat and other environmental factors, fishing had the primary
effect on catch per unit effort.
"The median and maximum size of fish was significantly higher
in unfished areas. We also found more and larger spawning-age
red drum, spotted seatrout, black drum, and striped mullet in
the unfished areas," said Johnson."But one of the most
significant results of the tagging element of the study documented
the migration of important fish from protected areas to fished
areas. Some fishes tagged in the protected zones were caught
by fishermen in unprotected areas. These and other observations
suggest that spawning by some species in protected zones may
further benefit surrounding fisheries."
The article "The Effectiveness of an Existing Estuarine
No-take Fish Sanctuary Within the Kennedy Space Center, Florida,"
can be found in volume 19 of the North American Journal of
Fishery Management, pages 436-453.Copies may be obtained
by writing to either Dr. James Bohnsack or Dr. Darlene Johnson
at the National Marine Fisheries Service Southeast
Fisheries Science Center, 75 Virginia Beach Drive, Miami,
Fla. 33149.
The National Marine Fisheries
Service is the principal steward of the nation's living marine
resources, regulating the nation's commercial and recreational
fisheries and managing species under the Magnuson-Stevens
Fishery Conservation and Management Act throughout federal
waters which extend 200 miles from the coastline. An agency of
the Commerce Department's National Oceanic and Atmospheric
Administration, NOAA Fisheries also protects marine and anadromous
species under the Endangered
Species Act and the Marine
Mammal Protection Act.
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