Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 32 for “"fishing gear"”.
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Effects and added drag on cetaceans : fishing gear entanglement and external tag
… balance can occur naturally or unnaturally. Fishing gear that entangles large whales adds drag, often altering energy balance to the point of terminal emaciation. An analog to this is drag from tags attached to cetaceans for research and monitoring. This thesis quantifies the effects of drag …
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Effects of added drag on cetaceans : fishing gear entanglement and external tag attachment
… balance can occur naturally or unnaturally. Fishing gear that entangles large whales adds drag, often altering energy balance to the point of terminal emaciation. An analog to this is drag from tags attached to cetaceans for research and monitoring. This thesis quantifies the effects of drag …
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Demography of Alligator Snapping Turtles (Macrochelys Temminckii) Along a Fishing Pressure Gradient
<p>Passive fishing gear is a threat to the alligator snapping turtle (<em>Macrochelys temminckii</em>). The spatio-temporal persistence of this threat and its impacts on <em>M. temminckii</em> populations has not been quantified. I quantified the density of passive fishing gear and the demographic …
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Seals and fisheries: a study of the conflict and some possible solutions
… for the development of alternative seal-safe fishing gear and mitigation methods. For some fisheries the improved understanding has led to a resolution of certain parts of the conflict. Certain coastal fisheries in the Baltic, such as the herring gillnet fishery, are at the point of collapse …
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The impact of longline fishing on the seabirds breeding on Marion Island
This study describes the impact of longline fishing on the seabirds breeding on the sub-Antarctic Prince Edward Islands. The development of a demersal longline fishery for Patagonian toothfish Dissostichus eleginoides close to the islands with almost complete observer coverage during the study …
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Unintended Consequences of Enforcement in a Fisheries Institution: Results from an Artefactual Experiment in Tanzania
<p>Overfishing and the destruction of fishing commons in developing countries is a growing problem. Policymakers and local community leaders are looking for solutions to keep their fishing commons sustainable. Fines and enforcement mechanisms are commonly suggested to help preserve the commons. …
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Fishing At Karluk: Nature, Technology, and the Creation of the Karluk Reservation In Territorial Alaska
<p>Fishing gear is indisputably central to the act of fishing, yet its importance to the history of commercial salmon fishing has been neglected. This thesis investigates the manifold ways that Native and white fishermen, canners, and federal bureaucrats utilized the beach seine and purse seine to …
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Economic Models of Recreational and Commercial Fishing and Their Impact on the Great Lakes Ecosystem
… of native fish that are produced using the same fishing gear. We find that fish harvest is insensitive to marginal changes in fish prices. We also find that fishers are able to target Asian carp effectively enough that harvest of native species will probably not increase. The third paper examines …
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Long-term changes in the incidence and characteristics of plastic ingested by White-chinned Petrels
… plastic. They are susceptible to being caught on fishing gear, providing large numbers of carcasses that can be used to monitor changes in the incidence and characteristics of plastic floating at sea. Of the 2477 White-chinned Petrels caught off South Africa between 1979 and 2023, 56% contained …
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Disentangling entanglement in Cape fur seals for better management of plastic pollution impacts
… from land-based sources, marine items such as fishing gear tend to be responsible for most entanglement incidents. Entanglement is a frequent threat to pinniped species leading to suffering and potential death of affected individuals. I use a long-term dataset to investigate temporal trends in …
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Overtrawlability and Mechanical Damage of Pipe-in-Pipe
… design of these systems with regards to fishing gear interaction has used the same approach as for single pipe systems. However, this approach is likely to result in a conservative design as the outer pipe is not required to resist internal pressure and can accommodate a greater level of …
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Assessment of dietary patterns and prey consumption of marine mammals: Grey seals (Halichoerus grypus) in the Baltic Sea
… and resource competition between seals and the fishing industry is a matter of debate. This thesis examines dietary patterns and prey consumption by grey seals collected in the Baltic Sea in 2001-2005. It is the first comprehensive study of the Baltic grey seal diet since the early 1970s. …
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Whale entanglements in South African trap fisheries and their potential mitigation through ropeless fishing techniques
… increasing frequency of whale entanglements in fishing gear is a global concern. In South African waters, the west coast rock lobster (WCRL), south coast rock lobster (SCRL) and octopus fisheries are responsible for whale entanglements in trap fishing gear. To better understand the interactions …
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Characterizing a Hidden Fishery: Setline Fishing in the New River, Virginia
… not accurately sample setline effort, a popular fishing gear for catfish. I characterized the New River setline fishery by estimating setline effort and catch rates of catfish and by-catch in 2011, and by investigating the attitudes and opinions of setline users during 2012. Setline effort was …
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Biomechanics of North Atlantic right whale bone : mandibular fracture as a fatal endpoint for blunt vessel-whale collision modeling
… Vessel-whale collisions and entanglement in fishing gear were indicated in 27 (67.5%) of the 40 right whales necropsied between 1970 and December 2006. Of those, at least 9 deaths (22.5%) resulted from blunt contact with a vessel. To reduce the likelihood of fatal collisions, speed …
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Biomechanics of North Atlantic right whale bone : mandibular fracture as a fatal endpoint for blunt vessel-whale collision modeling
… Vessel-whale collisions and entanglement in fishing gear were indicated in 27 (67.5%) of the 40 right whales necropsied between 1970 and December 2006. Of those, at least 9 deaths (22.5%) resulted from blunt contact with a vessel. To reduce the likelihood of fatal collisions, speed …
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Entangled Eden: ecological change and the Lake Huron Commercial Fisheries, 1835-1978
… new technologies and increased their quantity of fishing gear in an effort to maximize their catches in response to fluctuating returns. Economic considerations were of primary concern to both fishermen and government bureaucrats. Lake Huron’s status as an international borderland further …
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An Assessment of Sea Turtle, Marine Mammal and Seabird Bycatch in the Wider Caribbean Region
… migratory behavior exposes them to multiple fishing gear types and fishing practices and efforts to understand the rates of interaction between these taxa and fishing necessarily entails analysis of data over large spatial areas (ocean-basin) and multiple types of fishing activities. The …
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Implementation of fisheries co-management in Mweru- Luapula fishery, Northern Zambia.
… indicating awareness of the prescribed gear, fishers are undeterred from using illegal fishing gear owing to low penalty charges imposed on offenders and failure to integrate fishers in monitoring fellow fishers’ activities. Weak enforcement of fishery regulations and a lack of clearly …
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The Effect of "Casitas" on Lobster Biology and Fishery Sustainability in the Bahamas
… table-like structures) are a commercial fishing gear used to harvest Caribbean spiny lobster (<em>Panulirus argus</em>) in the Caribbean and in The Bahamas, where lobster is the most valuable fishery. Yet, casitas are largely unregulated in The Bahamas and they may threaten fishery …
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