Get it in gear : evaluating gear-based trade-offs in fisheries
department or school: Science, Faculty of
department or school: Oceans and Fisheries, Institute for the
data provider: DSpace
degree campus: UBCV
creator: Cashion, Timothy Robert
issued: 2020-05-05T22:12:38Z
issued: 2020
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: Fishing gears’ damaging effects on the ecosystems in which they operate are a major environmental challenge of capture fisheries. The full cost of fisheries is currently not internalized into the economy, and thus to properly evaluate the benefits received from fisheries globally we must undertake a quantitative evaluation of the costs and benefits of including the ecosystem services upon which it relies. This thesis fills this gap through a full cost-benefit analysis of the world’s fishing fleets. First, I quantify the catches, discards and values of marine capture fisheries by gear type. Different gears disproportionately contribute to landings and landed value in comparison to their costs of discards and the potential shadow-value of these discards. Second, I propose a method to evaluate the short-term trade-offs necessary for fishing firms to maximize their revenues and profits. I find that through optimal management and rebuilding that fishers could increase their catches and profits in the selected case studies. Third, I evaluate whether current consumer-based sustainability initiatives are achieving ‘on-the-water’ effects. Here, I find that there is little reward for best-performing actors but a strong effect causing worst-performers to decrease their catches. Finally, I use the data on capture fisheries by gear type from earlier in the thesis to evaluate areas of low-cost conservation for species threatened by fishing gear. My results highlight areas of high conservation concern for particular fishing gears, and areas of high overlap between multiple fishing gear threats and multiple species of conservation concern. Taken together, this thesis advances our knowledge of impacts and trade-offs associated with different fishing gear types and improves our ability to restrict these impacts through management and market-based initiatives.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/74341
note: GET IT IN GEAR: EVALUATING GEAR-BASED TRADE-OFFS IN FISHERIES by Timothy Robert Cashion B.A., Huron University College, 2013 M.E.S., Dalhousie University, 2015 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Oceans and Fisheries) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) MAY 2020 © Tim Cashion, 2020 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, the dissertation entitled: Get it in gear: evaluating gear-based trade-offs in fisheries submitted by Timothy Robert Cashion in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Oceans and Fisheries Examining Committee: Rashid Sumaila, Institute for the Oceans and Fisheries Supervisor Daniel Pauly, Institute for the Oceans and Fisheries Supervisory Committee Member Frederik Noack, Land and Food Systems Supervisory Committee Member Richard Barichello, Land and Food Systems University Examiner Gunilla Öberg, Institute for Resources, Environment and Sustainability University Examiner iii Abstract Fishing gears’ damaging effects on the ecosystems in which they operate are a major environmental challenge of capture fisheries. The full cost of fisheries is currently not internalized into the economy, and thus to properly evaluate the benefits received from fisheries globally we must undertake a quantitative evaluation of the costs and benefits of including the ecosystem services upon which it relies. This thesis fills this gap through a full cost-benefit analysis of the world’s fishing fleets. First, I quantify the catches, discards and values of marine capture fisheries by gear type. Different gears disproportionately contribute to landings and landed value in comparison to their costs of discards and the potential shadow-value of these discards. Second, I propose a method to evaluate the short-ter…
has type: Thesis/Dissertation
date issued: 2020-05
is shown at: 10.14288/1.0390356
language: eng
degree discipline: Oceans and Fisheries
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/74341