SUSTAINABLE USE OF SEA TURTLES - Examples of Sustainable Sea Turtle Use Across Life Cycles

Aug 25, 2026

SUSTAINABLE USE OF SEA TURTLES examines practical situations where harvesting and use of sea turtles remain clearly sustainable across different life-cycle stages. The note focuses on egg survival in mass nesting events, human-related interference such as egg poaching, and naturally occurring egg losses from nesting overlap, tides, surf conditions, and predators. It proposes a management approach: identify sources of natural mortality, protect eggs that would otherwise be lost, allocate part for replenishment of populations, and channel income to monitoring and further research.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages30

Reading Time1 h 16 min

AccessFree to download

SUSTAINABLE USE OF SEA TURTLES

Eggs

Adults

Webb,G.J.W.,Bayliss,P.G.and Manolis,S.C.(1986).Population research on crocodiles inthe Northern Territory,1984-1996.Pp.22-59 in Crocodiles.Proceedings of the 8thWorking Meeting of the IUCN/SSC Crocodile Specialist Group.Quito,Ecuador.IUCN:Gland,Switzerland. Webb,G.J.W.,Britton.A.R.C.,Manolis,S.C.,Ottley,B.and Stirrat,S.(2000).The recoveryof Crocodylus porosus in the Northern Territory of Australia:1971-1998.InProceedings of the 15th Meeting of the IUCN/SSC Crocodile Specialist Group,Varadero,Cuba,15-20 January 2000. Webb,G.J.W.and Carrillo,E:C.(2000).Risk of extinction and categories ofendangerment:perspectives from long-lived reptiles.Res.Popul.Ecol.42(in press).Webb,G.J.W.and Cooper-Preston,H.(1989).Effects of incubation temperature oncrocodiles and the evolution of repilian oviparity.Amer.Zool.29:953-971.Webb,G.J.W.and Manolis,S.C.(1992).Monitoring saltwater crocodiles(Crocodylusporosus)in the Northern Territory of Australia.Pp.404-418 in Wildlife 2001:Populations.McCullough,D.R.and Barrett,R.H.(eds).Elsevier Applied Science:London and New York. Webb,G.J.W.,Manolis,S.C.,Whitehead,P.J.and Lets,G.A.(1984).A proposal for thetransfer of the Australian population of Crocodylus porosus Schneider(1801),fromAppendix I to Appendix II of CITES.Report No.21.Conservation Commission of theNorthern Territory:Darwin. Webb,G.J.W.,Manolis,S.C.and Whitehead,P.J.(1987).Preface in Wildlife Management:Crocodiles and Alligators.Webb,G.J.w.,Manolis,S.C.and Whitehead,P.J.(eds).Surrey Beatty and Sons:Sydney. Webb,G.J.W.,Otley,B.,Britton,A.R.C.and Manolis.S.C.(1999).Recovery of SaltwaterCrocodiles(Crocodylus porosus)in the Northern Territory:1971-1998.Unpublishedreport for the Parks and Wildlife Commission of the Northern Territory.Webb,G.J.W.,Vardon,MJ.and Boeadi(1996).An assessment of the harvest levels andstatus of three species of reptile(Varanus salvator,Pyzhon reticulatus and P.curtis)in Indonesia.Pp.75-82 in Proceedings of the First International Conference onEastern Indonesia-Australian Vertebrate Fauna,Manado,Indonesia,22-26 November1994.Kitchener.D.J.and Suyanto,A.(eds).Western Australian Museum:Perth.Whitaker.R.and Andrews,H.V.(1996).Snake capture and venom extraction in TamilNadu,India.In Assessing the Sustainability of Uses of Wild Species.IUCN/SSCOccasional Papers no.12:40-46 Woodward,A.R.,Schoeb,T..Bermúdez.D.,Carbonneau,D.,Percival,H.F.and Ross,P.(2000).Unexplained adult mortality and poor egg viability of American alligators onLake Griffin,Florida:a progress report.In Proceedings of the 15th Meeting of theIUCN/SSC Crocodile Specialist Group,Varadero,Cuba.15-20 January 2000.Woodward,A.R..Moore,C.T.and Delaney,M.F.(1991).Experimental Alligator Harvest.Final Report,Study Number:7567.Bureau of Wildlife Research,Florida Game andFreshwater Fish Commission.Gainesville.118 pp. SUSTAINABLE USE OF SEA TURTLES N.MrosovskyDepartment of Zoology,University of Toronto,Toronto,Ontario,CANADA M5S 3G5 This note provides a few examples of situations in which useof sea turtles is clearly sustainable.Use may take place atdifferent stages of the life cycle. Eggs In the large arribadas(mass nestings)of olive ridleys,fewof the many eggs laid survive.In a good-sized arribada atNancite,Costa Rica,only about 5%of the eggs survive tohatch.About 17%of the eggs laid are destroyed by turtlesnesting.subsequently;this cause alone may account for aloss of 1.7 miilion eggs(Cornelius 1986). In Mexico also,there are some huge arribadas.Egg taking isprohibited.But it still goes on.A recent article byTennesen(1999), entitled "Mexico's turtle wars: how onecountry is battling poachers and saving sea turtles",describes with approval how more than 1/2 millionconfiscated turtle eggs were thrown into the sea to preventthem from being sold.This was just from one truck load;thetotal destroyed in the season was probably much higher.Surely,with impoverished communities along the west coastof Mexico,and with hundreds of thousands of turtles nestingthere,an

FAQs

哪些情形下海龟的利用可以被视为“可持续”？

文本给出若干情境，强调利用发生在生命周期的不同阶段，并且在特定条件下能保持可持续性。

海龟卵在大规模产卵（arribadas）中通常会发生什么损失？

很多卵难以孵化，部分会被后续再次产卵的海龟破坏；此外还有由海浪和潮汐等海洋因素造成的卵损失。

文中提出的总体做法是什么，用于实现卵利用与种群补充的平衡？

先识别自然死亡来源，再拯救原本会丧失的卵，并将其中一部分用于回补种群，另一部分用于利用；利用所获收入可支持进一步识别与监测。

针对成体（例如在受保护海滩）的案例，文中关注的关键指标是什么？

以绿色海龟在特定海滩的雌龟出卵（emergences）数量为例，展示多年间数量变化并指出相关报告中的警示。

Aug 25, 2026

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