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Author: Brett Michael Johnson
Publisher:
ISBN:
Category : Fishery management
Languages : en
Pages : 480
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Book Description
Tradicionaly recreational fishery management has focused on dynamics of individual fish populations. Attempts to improve fish populations center on manipulations of harvest or the population itself. However, outcomes of fishery management actions have been difficult to forecast. Ecological processes within fish communities and angler responses can produce unanticipated effects. This thesis documents my research on these processes in Lake Mendota to make fishery management a more holistic, predictive science. A food web manipulation began in 1987. This project used several fishery management tools to increase the biomass of piscivorus gamefish to evaluate food web manipulation as a water quality management tool. Forecasting and measuring direct and indirect effects of the manipulation were important objetives. To forecast how management would affect piscivore populations, and their consumption of prey, I combined two computer models: an age-structured population model and a bioenergetics model. This technique predicted how size, abundance, and consumption of piscivores changed with stocking rates and sire limits. A walleye stocking program that yielded 8,000 yearling/year doubled consumption demand; adding a 381-mm minimum size limit achieved another 50% increase. To predict consequences of piscivore management for prey populations, I studied predador and prey fish populations. Highley variable prey recuitment made forecasting impacts of piscivory difficult. Based on historic recruitment patterns, enhanced walleye populations could consume 65-100% of young-of-year perch biomass produced in low recruitment years. When recruitment was high walleyes consumed less than 5% of the biomass. Translating predicted piscivore consumption into perch dynamics was accomplished by incorporating prey recruitment uncertainty. Angler response to piscivore enhancements was intense. Angler effort increased four-fold and harvest rates doubled to 60% per year. As a result, forescasts of piscivore consumption demand and the effectiveness of food web manipulation dependend heavily on responses of sport anglers to piscivore populations. Hence, a better understanding of angler dynamics was required before ecological effects of fishery management actions could be predicted. I developed a predatory-prey model to study angler-piscivore interactions. This approach linked angler and fish dynamics, and provided the means to incorporate fish, anglers, and management actions within one framework.
Author: Brett Michael Johnson
Publisher:
ISBN:
Category : Fishery management
Languages : en
Pages : 480
Get Book Here
Book Description
Tradicionaly recreational fishery management has focused on dynamics of individual fish populations. Attempts to improve fish populations center on manipulations of harvest or the population itself. However, outcomes of fishery management actions have been difficult to forecast. Ecological processes within fish communities and angler responses can produce unanticipated effects. This thesis documents my research on these processes in Lake Mendota to make fishery management a more holistic, predictive science. A food web manipulation began in 1987. This project used several fishery management tools to increase the biomass of piscivorus gamefish to evaluate food web manipulation as a water quality management tool. Forecasting and measuring direct and indirect effects of the manipulation were important objetives. To forecast how management would affect piscivore populations, and their consumption of prey, I combined two computer models: an age-structured population model and a bioenergetics model. This technique predicted how size, abundance, and consumption of piscivores changed with stocking rates and sire limits. A walleye stocking program that yielded 8,000 yearling/year doubled consumption demand; adding a 381-mm minimum size limit achieved another 50% increase. To predict consequences of piscivore management for prey populations, I studied predador and prey fish populations. Highley variable prey recuitment made forecasting impacts of piscivory difficult. Based on historic recruitment patterns, enhanced walleye populations could consume 65-100% of young-of-year perch biomass produced in low recruitment years. When recruitment was high walleyes consumed less than 5% of the biomass. Translating predicted piscivore consumption into perch dynamics was accomplished by incorporating prey recruitment uncertainty. Angler response to piscivore enhancements was intense. Angler effort increased four-fold and harvest rates doubled to 60% per year. As a result, forescasts of piscivore consumption demand and the effectiveness of food web manipulation dependend heavily on responses of sport anglers to piscivore populations. Hence, a better understanding of angler dynamics was required before ecological effects of fishery management actions could be predicted. I developed a predatory-prey model to study angler-piscivore interactions. This approach linked angler and fish dynamics, and provided the means to incorporate fish, anglers, and management actions within one framework.
Author: Robert Arlinghaus
Publisher: Turnshare Ltd. - Publisher
ISBN: 1903343364
Category : Fishery management
Languages : en
Pages : 385
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Book Description
Author: Ahmad Shendi
Publisher:
ISBN:
Category : Fishery management
Languages : en
Pages : 316
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Book Description
There is increasing recognition of the sociocultural, economic, and ecological significance of recreational fishing as a fundamental element of the global wild capture fisheries. In New Zealand, recreational fishing is a very popular activity that many New Zealanders identify with, and that provides a variety of social, cultural and economic benefits for New Zealanders. Despite the significance of the recreational fishing sector as a resource user and contributor to fisheries impacts, it has gained little attention within fisheries management in New Zealand. Using the Hauraki Gulf as a case study, this research investigates the efforts to manage the New Zealand recreational fisheries sector within the current centralised management regime. To ensure the future sustainability of the fisheries resources and the health of the marine ecosystem, this research argues the importance of integrating the recreational fisheries sector into fisheries management. This involves examining current fisheries management in New Zealand, specifically the Quota Management System (QMS), and factors affecting the integration of the recreational sector. This research also considers the potential of Ecosystem Based Management (EBM) as a holistic approach to provide for the interests, needs and values of all stakeholders while also maintaining the health and function of the marine ecosystem. To achieve the research objectives, a qualitative methodology was adopted. In addition to the case study, key methods employed for this research were semi-structured interviews with recreational fishers and other stakeholders, and questionnaires with recreational fishers. The key findings highlight the importance of understanding the complex and dynamic nature of the sector so as to improve management of the sector. The research also indicates that participation and involvement of the recreational sector in fisheries management would remain limited if the legislative rights of the recreational sector under the Fisheries Act were not addressed and the distrust recreational fishers have towards the commercial sector and government was not resolved. Finally, the successful integration of the recreational sector also depends on the ability of recreational fishers to organise themselves and resolve their internal issues. The failure to do so would most likely see the continuation of current centralised fisheries management regime, where recreational fishers remain reliant on the voting booths to make their voices heard, and their direct influence on decision making remains limited.
Author: Food and Agriculture Organization of the United Nations
Publisher: Food & Agriculture Org.
ISBN: 9251072140
Category : Nature
Languages : en
Pages : 194
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Book Description
The importance of recreational fisheries is increasing in many transitional economies. These guidelines focus on recreational fisheries and describe strategies to promote environmentally sustainable and socially responsible management of such fisheries. To this end, the document details policy, managerial and behavioural recommendations for sustainable recreational fisheries.
Author: Sport Fishing and Boating Partnership Council (U.S.). Recreational Fisheries Stewardship Committee
Publisher:
ISBN:
Category : Fishing
Languages : en
Pages : 24
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Book Description
Author: Tony J. Pitcher
Publisher: John Wiley & Sons
ISBN: 0470995394
Category : Technology & Engineering
Languages : en
Pages : 290
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Book Description
Recreational or sport fishing is important for three major reasons: economic (it is a multi-billion dollar world industry); social (it is embedded in the cultures of many nations; ecological (it affects the environment and food webs in many ways). Recreational Fisheries covers a range of methods, case studies and perspectives on the multidisciplinary evaluation of the benefits and costs of sports fisheries. Tony Pitcher and Charles Hollingworth, the editors of this landmark publication, have drawn together chapters from more than 30 contributors from North America, Europe, Australia and South Africa, providing a truly international perspective on a global industry. Contents include detailed assessments, evaluations and survey mthods of sport fisheries in many countries. This book is an essential reference for anyone active in the management, assessment, policy making or development of sport and recreational fisheries worldwide. All fisheries scientists and managers will require a copy of this important publication. Environmental and aquatic scientists, ecologists and oceanographers will also find this book of great value in their work. Libraries in research establishments, laboratories and universities where fisheries and biological sciences are studied and taught should have multiple copies of this book. Covers a worldwide industry of great commercial importance. Internationally known editors and contributors from four continents. Uses case studies from around the globe to illustrate the subject. A core subject essential to fisheries scientists.
Author: Francisco Arreguín-Sánchez
Publisher: Springer Nature
ISBN: 3030968472
Category : Science
Languages : en
Pages : 174
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Book Description
This book provides cutting-edge scientific idea and novel concepts on the ecosystem-based approach to fisheries management. It begins by reviewing the scientific fundamentals and problems currently faced by conventional fisheries science, based on population dynamics. In turn, it reviews the theoretical basis of ecosystem dynamics, including selected ecosystem indicators. Surplus production and balanced harvests are discussed in the ecosystem dynamics context. Several ecosystem-holistic indicators are described, but particular emphasis is placed on two: the noxicline (gain in entropy due to loss of biomass) and resilience, which are expressed as ecosystem (holistic) points of reference for defining allowable harvest rates. Both biological (population) and ecosystem (holistic) points of reference are subsequently analyzed in the context of fisheries management and conservation. An adaptability concept is also discussed as a management policy for facing climate change. In closing, the concepts presented are applied to six study cases involving a range of different ecosystems and fisheries.
Author: Øystein Aas
Publisher: John Wiley & Sons
ISBN: 0470698144
Category : Technology & Engineering
Languages : en
Pages : 376
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Book Description
Recreational or sports fishing is a multi-billion dollar industry worldwide and in many countries represents an important social and cultural activity. In some regions, it also contributes significant income to tourism and tackle businesses. In addition to its importance from a social and economic standpoint, the impact of recreational fishing on the environment and on food webs can often be substantial. This important book represents the major output from the 4th World Recreational Fishing Conference held in Norway in June 2005. The conference focused on several topics and targeted all stakeholders in the recreational fishing sector, including researchers, managers, NGO representatives and businesses. This book reflects that diversity, encompassing a variety of approaches within its carefully selected and fully peer-reviewed chapters. Global Challenges in Recreational Fisheries is an essential purchase for fisheries managers, multidisciplinary fisheries scientists, marine and freshwater biologists, ecologists and environmental scientists. The book is highly relevant for graduate university courses in fisheries management and fisheries sciences. Libraries in all universities, government fish and wildlife agencies and research establishments where these subjects are studied and taught will need copies of this important publication.
Author: Tim McClanahan
Publisher: John Wiley & Sons
ISBN: 1405139323
Category : Technology & Engineering
Languages : en
Pages : 354
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Book Description
The world’s stocks of wild fish continue to decline, making the task of finding innovative, sustainable and socially acceptable methods of fisheries management more important than ever. Several new approaches from around the world have proved to be successful in stemming the decline whilst increasing fish catches, and under the editorship of McClanahan and Castilla this international team of authors have looked to these examples to provide the reader with carefully chosen case studies offering practical suggestions and solutions for problem fisheries elsewhere. Coverage includes: Community based fisheries Collaborative and co-operative fisheries management Coastal fisheries management The future for sustainable fisheries management Written by many of the world’s most experienced practitioners Fisheries Management: Progress toward sustainability is an important purchase for all fisheries scientists, managers and conservationists. All libraries in universities and research establishments where this area is studied and taught will find this book a valuable addition to their shelves.
Author: Donald Leal
Publisher: Lexington Books
ISBN: 0739128027
Category : Business & Economics
Languages : en
Pages : 262
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Book Description
"Increasing coastal populations, rising recreational demand, and growing conflicts with other users are adding to the challenge of managing marine recreational fisheries today. Traditional regulations - such as daily bag limits and seasonal closures - are often not enough to control fishing impacts and they tend to generate greater discontent and lower economic benefits in the angling community as they become more restrictive. This volume is the first to examine management approaches that promise to better control fishing, generate more information on fishing impacts, and give anglers more freedom to enjoy their sport."--BOOK JACKET.
