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Dissertations / Theses on the topic 'Turtle fisheries'

Author: Grafiati

Published: 4 June 2021

Last updated: 27 July 2025

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1

Livingstone, Suzanne Rachel. "Sea turtle ecology and conservation on the North Coast of Trinidad, West Indies." Thesis, University of Glasgow, 2006. http://theses.gla.ac.uk/4323/.

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Five species of sea turtle are known to nest on the north and east coast beaches of Trinidad, West Indies. In descending order of abundance: the leatherback (Dermochelys coriacea), the hawksbill (Eretmochelys imbricata), the green (Chelonia mydas), the olive ridley (Lepidochelys olivacea) and the loggerhead (Caretta caretta). This thesis investigates a number of aspects of the ecology and conservation of the sea turtles nesting and foraging on the north coast. Prior to this project, little research had been carried out on the north coast region, largely due to the difficulties of accessing the

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2

Gahm, Meghan P. "The development and evaluation of small specialized turtle excluder devices to reduce sea turtle bycatch in various small shrimp gears." ScholarWorks@UNO, 2019. https://scholarworks.uno.edu/td/2665.

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In the southeastern United States, skimmer trawls, pusher-head trawls, wing nets, and small try nets (headrope length less than 12-ft (3.66-m)) are exempt from using a turtle excluder device (TED) and instead must adhere to tow time restrictions as a mode to mitigate sea turtle bycatch. However, observer and stranding data indicate that these tow times may often be exceeded and result in mortality of sea turtles. The National Marine Fisheries Service (NMFS) published a notice of proposed rulemaking in December 2016 to extend TED requirements to other trawl types, however there has been limited

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3

Mangel, Jeffrey Charles. "Interactions of Peruvian small scale fisheries with threatened marine vertebrate species." Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/3483.

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Marine vertebrate species face unprecedented and ever increasing pressures as a result of human activity, primarily fishing, in the global oceans. One area of growing concern has been for the impacts of small-scale fisheries on these species. Over the past decade it has become increasingly clear that these under-studied fisheries have sizeable levels of catch and bycatch of many threatened and endangered species of sea turtles, seabirds and small cetaceans. This thesis presents a collection of chapters that investigate aspects related to the interactions of small-scale fisheries with threatene

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4

De, Kock Leon. "Development of abalone and sea turtle aquaculture ventures for export purposes : a technical, marketing and financial feasibility analysis." Thesis, Stellenbosch : Stellenbosch University, 1998. http://hdl.handle.net/10019.1/50932.

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Thesis (MBA)--Stellenbosch University, 1998.<br>ENGLISH ABASTRACT: The techniques for animal reproduction and husbandry for both abalone and sea turtle farming have been well established and researched over the last decade. Although market related data seems to be scarce, marketing analysis reviewed and conducted as part of this study suggests that extensive markets exist for live cocktail size abalone and sea turtle products, especially in the East Asian countries. A decline in natural resources and increased demand resulted in a fast expanding niche market for these products. This stud

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5

Seney, Erin Elizabeth. "Population dynamics and movements of the Kemp's ridley sea turtle, lepidochelys kempii, in the northwestern Gulf of Mexico." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2375.

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6

Montrond, Gilson. "Assessing sea turtle, seabird and shark bycatch in artisanal, semi-industrial and industrial of fisheries in the Cabo Verde Archipelago." Master's thesis, Faculty of Science, 2021. http://hdl.handle.net/11427/32854.

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Firstly, I am very grateful to Birdlife International for the MSc scholarship. I am also very grateful to Professor Peter Ryan of the FitzPatrick Institute of African Ornithology, University of Cape Town, for agreeing to supervise this project and for his guidance, insights and comments on the write-up. I am grateful to Sarah Saldanha, for all the support during this MSc. Many thanks also to Dr Ross Wanless, Dr Rima Jabado and Ruben Rocha for all support, guidance and advice. I want to thank a lot Andy Angel for their accommodation and all support in South Africa. I am grateful to all the UCT

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7

Seminoff, Jeffrey Aleksandr. "Biology of the East Pacific green turtle, Chelonia mydas agassizii, at a warm temperature feeding area in the Gulf of California, Mexico." Diss., The University of Arizona, 2000. http://hdl.handle.net/10150/284231.

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I studied the East Pacific green turtle, Chelonia mydas agassizii , at the Bahia de los Angeles foraging grounds of the Gulf of California from July 1995 to October 1999. Entanglement nets were used to capture 153 green turtles among 16 capture sites. Pooled straight carapace length (SCL; mean ± SE) was 75.1 ± 0.79 cm. Though there was no significant variation in mean SCL among years, there was evidence of a difference in mean SCL among capture sites. Most of the population (58%) consisted of immature turtles but did not differ significantly from a 1:1 immature:adult ratio. Pooled adult sex ra

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8

Stephens, Sarah Holland. "Genetic analysis of the Kemp's ridley sea turtle (Lepidochelys kempii) and estimates of effective population size." Texas A&M University, 2003. http://hdl.handle.net/1969/220.

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9

Colteaux, Benjamin C. "The Status of Snapping Turtles (Chelydra serpentina) in Virginia: Population Viability, Demography, Regulatory Analysis, and Conservation." VCU Scholars Compass, 2017. https://scholarscompass.vcu.edu/etd/5162.

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Snapping turtles (Chelydra serpentina) are being harvested in unprecedented numbers in the United States (US) to meet the needs of international markets. Over three million live snapping turtles from farm and wild caught stock were exported from the US to Asia in 2012-14 alone. In the Commonwealth of Virginia, records indicate that 29,860 snapping turtles were commercially harvested between 2000 and 2015. Size limits are often used to regulate harvest pressure in snapping turtles and other game species. I analyzed the historic harvest of eleven US states to test the efficacy of minimum-size li

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10

Louis-Jean, Laurent. "Étude de la pêche artisanale côtière aux filets de fond aux Antilles françaises afin de réduire les captures accidentelles de tortues marines et obtenir une activité plus durable." Thesis, Paris, EPHE, 2015. http://www.theses.fr/2015EPHE3028/document.

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Le plan de restauration des tortues marines aux Antilles françaises a été validé par le Conseil National pour la Conservation de la Nature en 2006. Les captures accidentelles dans les filets de fond, i.e. les trémail, folle et filet droit, sur le plateau continental constituent la principale menace. Des filets faisant varier la hauteur, le maillage et l’inclinaison ont été comparés à des filets professionnels au cours de 226 pêches expérimentales. Le trémail est peu sélectif. Des filets à profil bas permettent d’obtenir des rendements comparables et réduiraient les captures de tortues. Les cap

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11

Alfaro, Shigueto Joanna Olga Gissella. "Ecology and conservation of sea turtles in Peru." Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/3472.

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Some of the key elements to assess the status of any wildlife population in a given geographical area are the levels of recruitment, survival and mortality. Whilst most of the information on marine turtles has been obtained from nesting sites, turtles spend most of their lives at sea. The conservation status of marine turtles in the southeast Pacific is poorly documented. This is particularly true for countries like Peru, where nesting events are very rare, although five species of turtles from populations from all over the Pacific basin, use these waters as foraging grounds. Little informatio

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12

Mellet, Bernice. "Ecological risk assessment of fisheries on sea turtles in the South Western Indian Ocean." Thesis, Nelson Mandela Metropolitan University, 2015. http://hdl.handle.net/10948/9957.

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The SWIO is an area of great biodiversity and included in the diverse species that occupy the region are five species of sea turtles that include green turtles, hawksbills, leatherbacks, loggerheads and olive ridleys. Despite considerable conservation efforts at sea turtle rookeries in the South Western Indian Ocean, only green and loggerhead turtle populations have shown an increase in population size in recent years (<10 years), whereas leatherbacks remained stable and hawksbills and olive ridleys declined. This begs the question if fisheries (or other offshore pressures) are responsible for

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13

Nichols, Wallace J. "Biology and conservation of sea turtles in Baja California, Mexico." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/280439.

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I studied the in-water anthropogenic impacts on sea turtles, origins of sea turtles on foraging and developmental areas, their migration routes, and described regionally appropriate conservation needs. Sea turtles inhabiting Baja California waters originate on distant beaches in Japan, Hawaii, and southern Mexico. Results from genetic analyses, flipper tagging and satellite telemetry indicate loggerhead turtles (Caretta caretta) feeding along Baja California's coast are born in Japan and make a transpacific developmental migration of more than 20,000 km, encompassing the entire North Pacific O

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14

Guzman, Alejandra. "Bite performance and feeding kinematics in loggerhead turtles (Caretta caretta) within the context of longline fishery interactions." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2844.

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15

Nursey-Bray, Melissa. "Conflict to co-management : eating our words : towards socially just conservation of green turtles and dugongs in the Great Barrier Reef, Australia." Thesis, 2006. https://researchonline.jcu.edu.au/1579/2/02whole.pdf.

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Indigenous communities worldwide face multiple challenges to maintain their unique cultural identity and value systems. In the natural resource management arena, these challenges include the imposition of western solutions to environmental management and biodiversity protection. This imposition has caused the dispossession or relocation of Indigenous peoples from their lands, a loss of traditional ecological knowledge, social disempowerment and economic inequity. Indigenous peoples are responding to these challenges by asserting their cultural identity, developing cultural re-vitalisation p

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16

Nursey-Bray, Melissa. "Conflict to co-management : eating our words : towards socially just conservation of green turtles and dugongs in the Great Barrier Reef, Australia /." 2006. http://eprints.jcu.edu.au/1579.

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Thesis (Ph.D.) - James Cook University, 2006.<br>Appendix 2 (p. 444-454) contains the Research Agreement between the author and the Hopevale Community which governs further research or publications arising from the thesis. Typescript (photocopy). Bibliography: leaves 373-441.

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17

Delisle, Aurelie. "A socio-economic investigation of the Torres Strait Indigenous dugong and turtle fisheries." Thesis, 2012. https://researchonline.jcu.edu.au/44639/1/44639-delisle-2012-thesis.pdf.

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Dugongs (Dugong dugon) and green turtles (Chelonia mydas) are of international ecological and conservation significance. As one of the few developed countries in their range and with globally significant populations, Australia is in a key position to ensure the survival of both species. Dugongs and green turtles are protected under Australian national and state laws and the rights of Torres Strait Islanders to hunt these species are recognised in Commonwealth and state regulations and an international Treaty between Australia and Papua New Guinea. The Australian government must therefore ensur

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18

Grayson, Jillian. "Characteristics of traditional dugong and green turtle fisheries in Torres Strait: opportunities for management." Thesis, 2011. https://researchonline.jcu.edu.au/29585/1/29585_Grayson_2011_thesis.pdf.

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The management of dugongs (Dugong dugon) and green turtles (Chelonia mydas) is a complex social and ecological problem. Dugongs and green turtles are protected by Australian national and sub-national conservation legislation. Both species are important cultural, spiritual and economic (i.e., subsistence) resources for Indigenous Australians. In Australia, Aboriginal and Torres Strait Islander Traditional Owners may hunt these species to satisfy personal, domestic, or non-commercial communal needs. Torres Strait, not only has the largest population of dugongs in the world and one of the largest

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19

Bostwick, Angela Sue. "Use of Shark Shapes to Reduce Incidental Capture of Sea Turtles in the Long-Line Fisheries." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8409.

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An estimated 250,000 loggerhead (Caretta caretta) and leatherback (Dermochelys coriacea) sea turtles are taken each year as incidental catch by the pelagic long-line fishing industry. Various gear and bait modifications as well as time/area closures to fishing, enacted to reduce anthropogenic impacts on sea turtles, have been ineffective or incompatible with regional fishery interests. Chemosensory and auditory deterrents have yielded little benefit thus far in repelling sea turtles from long-lines. The fact that sea turtles are highly visual animals has precipitated studies of the efficacy of

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20

Robins, Julie Belinda. "A scientific basis for a comprehensive approach to managing sea turtle by-catch: the Queensland east coast as a case study." Thesis, 2002. https://researchonline.jcu.edu.au/1251/1/01front.pdf.

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The Australian continental shelf is one of the few remaining areas of the world where sea turtle populations have been subject to relatively small levels of direct harvest and where nesting- and feeding-ground habitats remain essentially intact. The area supports six of the world’s seven sea turtle species (i.e., Chelonia mydas, Caretta caretta, Eretmochelys imbricata, Natator depressus, Lepidochelys olivacea and Dermochelys coriacea), contains significant nesting populations of three species (i.e., Chelonia mydas, Caretta caretta, Eretmochelys imbricata), the world’s only nesting populations

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21

Robins, Julie Belinda. "A scientific basis for a comprehensive approach to managing sea turtle by-catch : the Queensland east coast as a case study /." 2002. http://eprints.jcu.edu.au/1251/1/01front.pdf.

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The Australian continental shelf is one of the few remaining areas of the world where sea turtle populations have been subject to relatively small levels of direct harvest and where nesting- and feeding-ground habitats remain essentially intact. The area supports six of the world’s seven sea turtle species (i.e., Chelonia mydas, Caretta caretta, Eretmochelys imbricata, Natator depressus, Lepidochelys olivacea and Dermochelys coriacea), contains significant nesting populations of three species (i.e., Chelonia mydas, Caretta caretta, Eretmochelys imbricata), the world’s only nesting populations

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22

Zachariah, Chaligné Alex. "Motivations for Community-based Conservation: A case from Odisha, India." 2016. http://hdl.handle.net/1993/31101.

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Community-based conservation includes natural resource or biodiversity protection by, for and with the local community. However, surprisingly little is known about what enables community-based conservation. The aim of this research was to explore and identify potential motivations of a community-based organization in choosing, in this case, conservation of endangered olive ridley sea turtles (Lepidochelys olivacea) as their flagship project. Samudram Women’s Federation, a State-level organization working with small-scale fishing communities in Odisha, India, was used as a case to explore

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23

Riskas, Kimberly Anne. "Addressing sources of data deficiency for sea turtles and fisheries in the Indian Ocean and Southeast Asia." Thesis, 2017. https://researchonline.jcu.edu.au/64402/1/JCU_64402_Riskas_2017_thesis.pdf.

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Marine turtle populations worldwide are threatened by a number of anthropogenic activities, of which fishing is unquestionably one of the most harmful. Though the effects of fisheries mortality have been documented across species, gear types and regions, management intervention remains constrained by data limitations even in well-monitored fisheries in developed nations. The issue of illegal, unreported and unregulated (IUU) fishing introduces further uncertainty into fisheries management regimes, with a lack of understanding of how IUU fishing activities affect marine turtle populations. For

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