Navigation Links
Accidental sea turtle deaths drop 90 percent in US fisheries
Date:9/14/2011

DURHAM, N.C. -- The number of sea turtles accidentally caught and killed in fishing gear in United States coastal waters has declined by an estimated 90 percent since 1990, according to a new study by researchers at Duke University Project GloBAL and Conservation International.

The report, published in the scientific journal Biological Conservation, credits the dramatic drop to measures that have been put into place over the last 20 years to reduce bycatch in many fisheries, as well as to overall declines in U.S. fishing activity.

The study's authors estimate that 4,600 sea turtles die each year in U.S. coastal waters.

Before measures to reduce bycatch were put in place, total sea turtle takes surpassed 300,000 annually. Of these, 70,000 turtles were killed.

The study used data collected from 1990 to 2007 by the National Marine Fisheries Service (NMFS) to determine bycatch rates across more than 20 fisheries operating in Atlantic waters from the Gulf of Mexico to the Canadian border, and in the Pacific Ocean, along the West coast and around Hawaii.

It found that overall turtle bycatch rates, including both fatal and nonfatal run-ins, have fallen about 60 percent since 1990.

Shrimp trawls in the Gulf of Mexico and southeastern U.S. accounted for up to 98 percent of all by-catch takes and deaths during the study period.

All six marine turtle species that occur in U.S. waters are categorized as threatened or endangered on the U.S. Endangered Species List. They are loggerheads, leatherbacks, hawksbills, olive ridleys, Kemp's ridleys and green sea turtles.

Bycatch is an acute threat to sea turtle populations worldwide. High bycatch rates can be indicative of unsustainable fishing practices that negatively impact the health of marine ecosystems.

"The reduction of bycatch and mortality shows important progress by NMFS, which serves as a model for reducing sea turtle bycatch in other parts of the world," says Elena Finkbeiner, a PhD student at Duke and lead author of the paper. "Our findings show that there are effective tools available for policymakers and fishing industries to reduce sea turtle bycatch, as long as they are implemented properly and consistently."

Among the mitigation strategies that have helped reduce bycatch are: the use of circle hooks and dehooking equipment in longline fisheries, to reduce the severity of turtle injuries; the use of turtle excluder devices (TEDs) in shrimp trawl nets to allow captured sea turtles to escape; and the implementation of time-area closures to restrict fishing activities at times and places turtles are most likely to be present in the highest numbers.

Piecemeal regulation remains a problem, the study notes. Sea turtles are currently managed on a fishery-by-fishery basis, which means that bycatch limits are set for each fishery without accounting for the overall population impacts of all the takes added together. This fragmented approach leads to total allowed takes that exceed what sea turtle populations can sustain.

"Bycatch limits must be set unilaterally across all U.S. fisheries with overall impacts to populations in mind, much as it's done for marine mammals," says co-author Bryan Wallace, director of science for Conservation International's Marine Flagship Species Program and adjunct faculty member at Duke's Nicholas School of the Environment.

The researchers note that actual bycatch rates are likely higher than what the study reports because in many fisheries, particularly the shrimp trawl fishery, the number of on-board observers who document bycatch on fishing vessels is low relative to the sheer volume of fishing that is occurring.

"This paper provides a baseline to examine what is working and what can be improved in preventing sea turtle bycatch," Finkbeiner says. "It (makes) a strong case for the need for increased observer coverage and bycatch reporting."


'/>"/>
Contact: Tim Lucas
tdlucas@duke.edu
919-613-8084
Duke University
Source:Eurekalert

Related biology news :

1. Accidental discovery produces durable new blue pigment for multiple applications
2. How can accidental captures of loggerhead turtles be reduced?
3. Tobacco companys new, dissolvable nicotine products could lead to accidental poisoning
4. Evidence that nanoparticles in sunscreens could be toxic if accidentally eaten
5. Study finds high mortality of endangered loggerhead sea turtles in Baja California
6. Turtle doves commit adultery
7. Revealing the evolutionary history of threatened sea turtles
8. Scientists call for protected swimways for the endangered leatherback sea turtle
9. Turtles alter nesting dates due to temperature change says ISU researcher
10. No place like home: New theory for how salmon, sea turtles find their birthplace
11. Cost of hatchling turtles dash for freedom
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/3/2017)... 3, 2017  Data captured by IsoCode, ... detected a statistically significant association between the ... treatment and objective response of cancer patients ... predict whether cancer patients will respond to ... well as to improve both pre-infusion potency testing ...
(Date:3/29/2017)... , March 29, 2017  higi, the health ... in North America , today announced ... and the acquisition of EveryMove. The new investment and ... set of tools to transform population health activities through ... lifestyle data. higi collects and secures data ...
(Date:3/24/2017)... Research and Markets has announced the addition of the ... Forecast to 2025" report to their offering. ... The Global Biometric Vehicle Access System ... over the next decade to reach approximately $1,580 million by 2025. ... forecasts for all the given segments on global as well as ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... ... October 11, 2017 , ... Disappearing forests and increased emissions are ... 5.5 million people each year. Especially those living in larger cities are affected by ... in one of the most pollution-affected countries globally - decided to take action. , ...
(Date:10/10/2017)... (PRWEB) , ... October 10, ... ... development-stage cancer-focused pharmaceutical company advancing targeted antibody-drug conjugate (ADC) therapeutics, today confirmed ... targeted HPLN (Hybrid Polymerized Liposomal Nanoparticle), a technology developed in collaboration with ...
(Date:10/10/2017)... Calif. , Oct. 10, 2017 SomaGenics ... from the NIH to develop RealSeq®-SC (Single Cell), expected ... for profiling small RNAs (including microRNAs) from single cells ... Program highlights the need to accelerate development of approaches ... "New techniques for measuring levels ...
(Date:10/9/2017)... ... ... The award-winning American Farmer television series will feature 3 Bar Biologics in an ... on RFD-TV. , With global population estimates nearing ten billion people by 2050, ... a growing nation. At the same time, many of our valuable resources are becoming ...
Breaking Biology Technology: