EurekaMag.com logo
+ Site Statistics
References:
53,869,633
Abstracts:
29,686,251
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Effect of three bycatch reduction devices on diamondback terrapin Malaclemys terrapin capture and blue crab Callinectes sapidus harvest in Delaware bay



Effect of three bycatch reduction devices on diamondback terrapin Malaclemys terrapin capture and blue crab Callinectes sapidus harvest in Delaware bay



North American Journal of Fisheries Management 21(4): 825-833, November



In recent years, reduction of the taking of nontarget species in fisheries worldwide has received considerable attention. Bycatch mortality in pot fisheries has led to severe declines in local populations of the diamondback terrapin Malaclemys terrapin along the U.S. East Coast. We conducted a 4-year study between 1997 and 2000 to investigate the impact of four bycatch reduction devices (BRDs), wire rectangular devices fitted into the entrance of crab traps, on diamondback terrapin bycatch mortality as well as its effect on the harvest of blue crabs Callinectes sapidus in the Delaware River estuary. A total of 52 sets consisting of five replicate blue crab pots for each BRD treatment (5.0X10.0, 5.0X12.0, 4.5X12.0, and 3.8X12.0 cm) and controls were deployed at random in 10 tidal tributaries and inland bays within the Delaware estuary. During this study 372 diamondback terrapins and 3,522 legal-size blue crabs were caught. The 5-cmX12-cm BRD was the only treatment for which the reduction in overall diamondback terrapin catches (-12%) was not statistically significant. In crab pots fitted with the 5-cmX10-cm BRD, we observed a statistically significant (P<0.01) reduction in terrapin catches (-59%) versus control pots, with no statistical difference in blue crab catches. Only a nominal loss (-12%) of legal-size blue crab catches was observed in pots fitted with the 4.5-cmX12.0-cm BRD, whereas the reduction in diamondback terrapin captures (38% male and 96% female) was significant (P<0.01). No diamondback terrapins were captured in the smallest BRD (3.8X12.0 cm), but the losses of legal-size blue crab catches were substantial (26%). We therefore recommend the use of the 4.5-cmX12.0-cm BRD with recreational crab pots as a conservation measure because this would effectively protect all subadult and reproductive female diamondback terrapins with minimal loss of legal blue crabs. We also stress the importance of using the BRDs in concert with other conservation measures, such as efforts directed at monitoring the effects of BRD implementation on bycatch mortality and preservation of nesting.

(PDF emailed within 0-6 h: $19.90)

Accession: 010537938

Download citation: RISBibTeXText

DOI: 10.1577/1548-8675(2001)021<0825:eotbrd>2.0.co;2



Related references

The effectiveness of bycatch reduction devices on crab pots at reducing capture and mortality of diamondback terrapins (Malaclemys terrapin) in Florida. Estuaries and Coasts 30(1): 179-185, 2007

Impact of a bycatch reduction device on diamondback terrapin and blue crab capture in crab pots. Ecological Applications 10(3): 882-889, June, 2000

Incidental capture of diamondback terrapin malaclemys terrapin by crab pots. Estuaries 6(4): 426-430, 1983

Conservation and research of the northern diamondback terrapin Malaclemys terrapin terrapin at the Wetlands Institute of Stone Harbor New Jersey, USA Methodes de protection et recherches effectuees sur la Malaclemmyde du Nord Malaclemys terrapin terrapin par lInstitut des zones humides de Stone Harbor New Jersey, USA. Manouria. Juin; 619: 30-33, 2003

Crab-eating in the diamondback terrapin Malaclemys terrapin: Dealing with dangerous prey. Journal of the Marine Biological Association of the United Kingdom 72(4): 835-848, 1992

The impact of commercial crab traps on northern diamondback terrapins, Malaclemys terrapin terrapin. Unknown, 1997

Bycatch reduction device conserves diamondback terrapin without affecting catch of blue crab. Marine Ecology Progress Series: 171-179, 2010

Experiences with the raising, keeping and breeding of the diamondback terrapin Malaclemys terrapin macrospilota Erfahrungen bei der Aufzucht, Haltung und Nachzucht der Schmuck-Diamantschildkroete Malaclemys terrapin macrospilota. Radiata. November; 144: 3-13, 2005

Diamondback terrapin (Malaclemys terrapin) mortality in crab pots. Conservation Biology 11(5): 1166-1172, 1997

Predation on hatchling diamondback terrapin malaclemys terrapin schopff by the ghost crab ocypode quadrata fabricius. Florida Scientist 54(3-4): 215-217, 1991

Predation on hatchling diamondback terrapin, Malaclemys terrapin (Schoepff), by the ghost crab, Ocypode quadrata (Fabricius). Florida Scientist, 543-4: 215-217, 1991

Predation on hatchling diamondback terrapin, Malaclemys terrapin (Schoepff), by the ghost crab, Ocypode quadrata (Fabricius). 2. Florida Scientist. Winter-Spring; 571-2: 1-5, 1994

Bufo fowleri (Fowler's toad) and Malaclemys terrapin terrapin (northern diamondback terrapin). Refugia and nesting. Herpetological Review e; 34(2): 135, 2003

Cape and islands rare and endangered wildlife. Northern diamondback terrapin (Malaclemys terrapin terrapin). Cape Naturalist, 172: 27, 1988

Terrapins, tires and traps: conservation of the northern diamondback terrapin (Malaclemys terrapin terrapin) on the Cape May Peninsula, New Jersey, USA. Unknown, 1995