Virginia Saltwater Fishing

NOAA’s Fisheries Service has launched a voluntary program to encourage commercial and recreational fishermen to safely release Atlantic shortfin mako sharks alive and report the releases to NOAA for posting on an online map.

The new program is designed to encourage the conservation of North Atlantic shortfin mako sharks. Scientific research shows many of these sharks are being caught and kept, damaging the long-term sustainability of the population. The most recent assessment of North Atlantic shorfin makos found that the population had declined about 50 percent from the 1950s.

Commercial and recreational fishermen can submit an online form to NOAA with information about where and when they release shortfin mako sharks, and their information will be posted on an online map. The map will enable fishermen to see how they are making a difference in the conservation of shortfin mako sharks and encourage others to release sharks. By charting how and where fishermen release sharks, NOAA hopes to encourage other fishermen to do the same.

“We are working with the fishing community to encourage fishermen to voluntarily release these sharks alive to help sustain the shortfin mako population,” said Eric Schwaab, assistant NOAA administrator for NOAA’s Fisheries Service. “By releasing sharks that are unintentionally caught or caught for sport, U.S. fishermen will be leaders in encouraging fishermen from other nations to conserve this shark species.”

Shortfin mako sharks, like other shark species, grow slowly, mature late, and produce few young, making them vulnerable to fishing. The average female shortfin mako shark becomes sexually mature at 18, while males are mature at 8. This highly migratory species is managed by the International Commission for the Conservation of Atlantic Tunas, to which the U.S. is a member. The U.S. has been a leader in urging the international commission to adopt conservation measures to help rebuild the species.

Shortfin makos are often caught unintentionally by commercial fishermen who are targeting swordfish and tuna with longline gear. They are also caught by recreational fishermen and are a popular catch in shark tournaments. An increasing number of these tournaments encourage the live release of sharks to promote conservation.

It is legal for commercial and recreational fishermen to retain the sharks. However, recreationally caught sharks must not be smaller than 54 inches from the tip of the shark’s nose to the fork of its tail. While some fishermen continue to retain shortfin makos for food, fins, and jaws, NOAA’s Fisheries Service encourages fishermen to consider the effect on the stock in the long-term and choose to release them.

NOAA encourages fishermen to learn how to safely release sharks so that they are not injured and the sharks are released in good condition. Fishermen may obtain a brochure at http://www.nmfs.noaa.gov/sfa/hms/Compliance_Guide/index.htm on the safe release of sharks and other highly migratory species.

For more information about the program, to view the interactive map and learn how to submit information on a live shark release, go to http://www.nmfs.noaa.gov/sfa/hms/shortfinmako/index.htm

source: NOAA press release

Billfish and tuna, important commercial and recreational fish species, may be more vulnerable to fishing pressure because of shrinking habitat according to a new study published by scientists from NOAA, the Billfish Foundation, and the University of Miami.

An expanding zone of low oxygen, known as a hypoxic zone, in the Atlantic Ocean is encroaching on these species’ preferred oxygen-abundant habitat, forcing them into shallower waters where they are more likely to be caught.

While hypoxic zones occur naturally in many areas of the world’s tropical and equatorial oceans, scientists are concerned because these zones are expanding and occurring closer to the sea surface, and are expected to continue to grow as sea temperatures rise.

source: NOAA Fish News

A new climate-population model developed by NOAA scientists to study rising ocean temperatures and fishing rates on one East Coast fish population could also forecast the impact of climate change and fishing on other fisheries.

The model is one of the first to directly link a specific fish stock with climate change. In a paper in the March 2010 issue of the journal Ecology Applications published online by the Ecological Society of America, NOAA researchers forecast the future of the Atlantic croaker fishery in the mid-Atlantic under various climate and fishing scenarios.

Atlantic croaker (Micropogonias undulatus) is a coastal marine fish inhabiting the east coast of the United States with an $8 million annual commercial fishery. Previous studies have shown a strong link between croaker abundance and winter temperatures.

“Some fish populations will increase and others decrease as a result of climate change,” said lead author Jon Hare of the

Northeast Fisheries Science Center (NEFSC) laboratory in Narragansett, R.I. “Our results demonstrate that climate effects on fisheries must be identified and understood, included in the scientific advice to managers, and factored into fishery management plans if sustainable exploitation is to be achieved.”

For various temperature and fish population scenarios over the next 90 years to 2100, the researchers forecast that at current levels of fishing, the spawning population of Atlantic croaker would increase between 60 and 100%, the center of the population would shift 50 to 100 kilometers (roughly 30 to 65 miles) northward, and the maximum sustainable yield would increase 30 to 100%.

With ocean temperatures expected to increase through the 21st century, the researchers developed the population model for Atlantic croaker based on the hypothesis that recruitment, or survival of juveniles to adulthood, is determined by winter water temperature. Atlantic croaker spawn in the coastal ocean and larvae enter estuaries in Delaware Bay, Chesapeake Bay, and Pamlico Sound 30 to 60 days after hatching. Juveniles spend their first winter in these estuarine nursery habitats.

Temperature during this winter period is very important to juvenile survival. Temperature forecasts were obtained from 14 General Circulation Models (GCMs) used by the Intergovermental Panel on Climate Change (IPCC) to simulate three carbon dioxide emission scenarios through 2100: atmospheric carbon dioxide fixed at 350 , 550 and 720 parts per million (ppm). By comparison, the atmospheric concentration of carbon dioxide in February 2010 was 389.91ppm.

Hare and colleagues from NOAA’s Northeast and Southeast Fisheries Science Centers, in collaboration with climate modelers from NOAA’s Earth System Research Laboratory in Boulder, Colo., linked the Atlantic croaker population model with forecasts of minimum winter temperature from the 14 GCMs. These linked modeling efforts provided estimates of the abundance, distribution, and yield of the Atlantic croaker population under different climate change scenarios and different fishing rates.

With increasing minimum winter temperatures, the NOAA model predicted that Atlantic croaker abundance will increase. Higher temperatures result in higher recruitment, which leads to a larger spawning stock. At current levels of fishing mortality, all 14 GCM models and all climate scenarios predicted higher population abundances than observed since the early 1970’s, when estimates of spawning stock were first developed. Even at higher fishing mortality rates, the models and climate scenarios predicted higher populations than observed in the past.

“Although our model does not include all potential environmental complexities, the recruitment hypothesis on which it is based is supported by both laboratory and field work, and is consistent with current fishery population models,” Hare said.

“The modeling work represents one of the first attempts to link a group of general circulation models to fish population models. The outputs from 14 GCM models are all consistent, so we have confidence in our long-term forecasts.”

This approach could be used for other species where an environmental link to population dynamics is established.

“Most stock assessments that inform fishery management decisions do not include the effect of a changing environment because they are conducted annually or every few years and do not provide a long-term view,” said Hare. “Understanding and quantifying the effect of climate change on populations, in combination with the effect of exploitation, is a major challenge to rebuilding and maintaining sustainable fisheries in the coming decades.”

Another challenge is developing climate models that forecast on shorter timer scales than the current 50 to 100 years.

source: NOAA press release

The Recreational Fishing Alliance (RFA) has released “Fatally Flawed” Science Killing America’s Number One Outdoor Pastime – An RFA Exclusive Report

The report notes that despite a National Research Council (NRC) report that shows the current statistical approach in the recreational sector is wrought with “serious flaws” and uses “inadequate analysis methods that need to be addressed immediately,” the National Marine Fisheries Service continues using “fatally flawed” data to deny the public access to coastal fisheries, while crippling the recreational fishing industry.

for more information, see www.joinrfa.org/