History
The first TED, was based on a device called the jellyball shooter, that is used to removed cannonball jellyfish from shrimp trawl. [1] [2] TEDs were later developed in the 1970s by Wil Seidel, who worked for NOAA. Some resistance to the use of TEDs has arisen from the belief that the use of the devices actually causes fishermen to lose shrimp and other targeted species. [3]
In 1987, the United States required all shrimp trawlers to equip their nets with turtle excluder devices. [4] Two years later the shrimp-turtle law was implemented. This required all countries that export shrimp to the US to certify that the shrimp they shipped were harvested by boats equipped with TEDs. Countries that cannot guarantee the use of the escape devices were banned from exporting shrimp to the US. [5]
In 1996, the government of India proposed legislation for the requirement of modified "indigenous" TEDs, which they called TSDs (turtle saving devices), to be used by local fishermen. This was a response to the declining olive ridley population that were nesting in beaches such as in Odisha. The modified TSDs were similar to standard TEDs except for having fewer bars. This resulted in the increase of the distance between each pair of bars to ensure that bigger specimens of shrimp and fish were able to pass through the TSD and into the net. [6]
Failings and drawbacks
While turtle excluder devices have been somewhat successful in lessening sea turtle casualties as by-catch, they still have a few failings and drawbacks.
It has been acknowledged that the larger sea turtles, primarily large loggerheads and leatherbacks, are too large to fit through the escape hatches installed in most TEDs. These turtles remain trapped within the net and perish. U.S. legislation introduced in 2003 attempted to address this issue by increasing the size of the escape chutes in the devices. [5]
It is difficult to enforce TED compliance as TEDs can reduce the efficiency of the net system, resulting in a loss of some of the catch. On a per boat basis, turtles are rarely caught; in one study, only one turtle was caught per 322.5 hours in the Gulf of Mexico. [11] This creates an incentive for the trawler to cheat. The catch loss can be eliminated by simply tying the turtle escape opening shut with a tie. The tie is removed when the vessel returns to port, thus avoiding detection by enforcement officers, but placing turtles at risk while trawling. It has been theorized that the spike in dead turtles seen in the Gulf of Mexico in June and July 2010 was due to shrimp boats that were taking advantage of lax marine enforcement due to the gulf oil spill. [12]
Occasionally TED use becomes impractical due to debris in the water. When a TED is clogged with debris, it can no longer catch fish effectively or exclude turtles. For example, in September 2008 following Hurricanes Gustav and Ike, the National Marine Fisheries Service (NMFS) allowed temporary use of "Tow Times" in lieu of TEDs. Vessels were required to limit their tows to 55 minutes from the time the trawl doors entered the water until they were retrieved from the water. In June 2010 the limit was further reduced to 30 minutes. [13] However, vessels were not equipped with tow time data loggers, so there was no practical method to enforce these time limits. [14]
The TTED
The TTED (trash and turtle excluder device) is a refinement of the TED, which, as well as turtles, can additionally free other forms of bycatch; "trash" refers to these other species. [15] The TTED reduces sorting time and risks of injury due to sharks and rays being caught, improves the quality of shrimps, which are less likely to be crushed in the bottom of the trawl, and may also lead to a reduction in the amount of fuel consumed by the boats. [16]
The TTED is the culmination of years of research. With funding provided by the European Union and the DIREN (Regional Environmental Authorities), WWF commissioned a study from IFREMER (French Research Institute for Exploitation of the Sea) to determine which selective gear was the most adapted to fishing conditions in French Guiana. These initial trials, conducted under experimental conditions, were carried out on board a shrimp trawler. Following this work, shrimp industry's members expressed the need to continue these experiments and to become more involved in the project. In response, WWF and the CRPMEMG (French Guiana Regional Fishery and Ocean Farming Committee) began working in close collaboration in order to test and develop the best gear for the French Guiana fleet. [16]
With technical support from NOAA and IFREMER, the CRPMEMG carried out numerous at sea trials in close collaboration with French Guiana fleets. [15] Specific parameters were tested, such as the shape and spacing between the bars of the selective grid. These trials allowed the fleets and the crews on board the shrimp trawlers to understand the advantages of more selective fishing gear and the benefits of using it in French Guiana. Based on the results and the captains' recommendations, the CRPMEMG decided to make the use of this TTED system mandatory by January 2010, when the annual fishing licences are issued. Many Captains were already using the TTED device on their shrimp trawlers well before January 2010. [16]
The TTED was developed by the CRPMEMG and fishermen with the assistance of NOAA, IFREMER, the French Ministry of Agriculture and Fisheries, French Guiana, the European Fund for Fisheries (FEP) and the WWF. [16]
Trawling is a method of fishing that involves pulling a fishing net through the water behind one or more boats. The net used for trawling is called a trawl. This principle requires netting bags which are towed through water to catch different species of fishes or sometimes targeted species. Trawls are often called towed gear or dragged gear.
Longline fishing, or longlining, is a commercial fishing angling technique that uses a long main line with baited hooks attached at intervals via short branch lines called snoods or gangions. A snood is attached to the main line using a clip or swivel, with the hook at the other end. Longlines are classified mainly by where they are placed in the water column. This can be at the surface or at the bottom. Lines can also be set by means of an anchor, or left to drift. Hundreds or even thousands of baited hooks can hang from a single line.This can lead to many deaths of different marine species Longliners – fishing vessels rigged for longlining – commonly target swordfish, tuna, halibut, sablefish and many other species.
Bycatch, in the fishing industry, is a fish or other marine species that is caught unintentionally while fishing for specific species or sizes of wildlife. Bycatch is either the wrong species, the wrong sex, or is undersized or juveniles of the target species. The term "bycatch" is also sometimes used for untargeted catch in other forms of animal harvesting or collecting. Non-marine species that are caught but regarded as generally "undesirable" are referred to as "rough fish" and "coarse fish".
Bottom trawling is trawling along the seafloor. It is also referred to as "dragging". The scientific community divides bottom trawling into benthic trawling and demersal trawling. Benthic trawling is towing a net at the very bottom of the ocean and demersal trawling is towing a net just above the benthic zone. Bottom trawling can be contrasted with midwater trawling, where a net is towed higher in the water column. Midwater trawling catches pelagic fish such as anchovies and mackerel, whereas bottom trawling targets both bottom-living fish (groundfish) and semi-pelagic species such as cod, squid, shrimp, and rockfish.
Cetacean bycatch is the incidental capture of non-target cetacean species such as dolphins, porpoises, and whales by fisheries. Bycatch can be caused by entanglement in fishing nets and lines, or direct capture by hooks or in trawl nets.
The National Marine Fisheries Service (NMFS), informally known as NOAA Fisheries, is a United States federal agency within the U.S. Department of Commerce's National Oceanic and Atmospheric Administration (NOAA) that is responsible for the stewardship of U.S. national marine resources. It conserves and manages fisheries to promote sustainability and prevent lost economic potential associated with overfishing, declining species, and degraded habitats.
The shrimp fishery is a major global industry, with more than 3.4 million tons caught per year, chiefly in Asia. Rates of bycatch are unusually high for shrimp fishing, with the capture of sea turtles being especially contentious.
Kemp's ridley sea turtle, also called the Atlantic ridley sea turtle, is the rarest species of sea turtle and is the world's most endangered species of sea turtle. It is one of two living species in the genus Lepidochelys.
Unsustainable fishing methods refers to the utilization of the various fishing methods in order to capture or harvest fish at a rate which sees the declining of fish populations over time. These methods are observed to facilitate the destructive fishing practices that destroy ecosystems within the ocean, and is used as a tool for over-fishing which results in the depletion of fish populations at a rate that cannot be sustained.
Ocean Conservancy is a nonprofit environmental advocacy group based in Washington, D.C., United States. The organization helps formulate ocean policy at the federal and state government levels based on peer reviewed science.
In 1994, the WTO intervened to address member concerns regarding the import of shrimp and its impact on turtles. This became known as the Shrimp and Turtle case. The ruling was adopted on November 6, 1998. However, Malaysia persisted in their complaint and initiated DSU Article 21.5 proceedings against the U.S. in 2001, but the U.S. prevailed in those hearings.
This is a glossary of terms used in fisheries, fisheries management and fisheries science.
As with other countries, the 200 nautical miles (370 km) exclusive economic zone (EEZ) off the coast of the United States gives its fishing industry special fishing rights. It covers 11.4 million square kilometres, which is the second largest zone in the world, exceeding the land area of the United States.
In the fishery business, a bycatch reduction device is a tool designed to minimize unintended capture of marine animals, thus reducing the adverse effects of fishing on the ecosystem.
NOAAS Oregon II is an American fisheries research vessel in commission in the National Oceanic and Atmospheric Administration (NOAA) fleet since 1977. Prior to her NOAA career, she was delivered to the United States Fish and Wildlife Service's Bureau of Commercial Fisheries in 1967 and was transferred to NOAA in 1970, but was not placed in commission until 1977.
The Hawaii longline fishery is managed under Western Pacific Regional Fishery Management Council’s (WPRFMC's) Pelagics Fisheries Ecosystem Plan. Through this plan, the WPRFMC has introduced logbooks, observers, vessel monitoring systems, fishing gear modifications and spatial management for the Hawaii longline fishery. Until relatively recently, the main driver for management of the Hawaii longline fishery has been bycatch and not fishery resources.
Gulf Wild is a nonprofit organization operating in the Gulf of Mexico. Gulf Wild works with commercial fishermen to encourage and facilitate fishery conservation and innovation. Gulf Wild has implemented traceability practices including placing a numbered gill tag on every Gulf Wild fish. This numbered tag tracks who harvested the fish, from where, and at what port the fish landed. Consumers can use the gill tag number to access this information via the Gulf Wild website.
Worldwide, hundreds of thousands of sea turtles a year are accidentally caught in shrimp trawl nets, on longline hooks and in fishing gill-nets. Sea turtles need to reach the surface to breathe, and therefore many drown once caught. Loggerhead and hawksbill turtles are particularly vulnerable. Nearly all species of sea turtle are classified as Endangered. They are killed for their eggs, meat, skin and shells. They also face habitat destruction. Climate change has an impact on turtle nesting sites. As fishing activity expands, this threat is more of a problem.
The loggerhead sea turtle, is protected under the Endangered Species Act (ESA) of 1973. It was originally listed as a threatened species on July 28, 1978. The turtle's status was updated to Vulnerable (VU) on August 23, 2018. The loggerhead turtle is the most prolific species of sea turtle in U.S. coastal waters.
NOAAS Oregon, previously NOAAS Oregon, was an American fisheries research vessel in commission in the National Oceanic and Atmospheric Administration (NOAA) fleet from 1970 to 1980. Prior to her NOAA career, she operated under the United States Fish and Wildlife Service from 1949 to 1970 as US FWS Oregon.
