Science Current Events | Science News | Brightsurf.com
 

PNAS: Evolutionary changes could aid fisheries

July 19, 2013
Sustainable fishing practices could lead to larger fishing yields in the long run, according to a new study that models in detail how ecology and evolution affect the economics of fishing.

Evolutionary changes induced by fisheries may benefit the fishers, according to a new study published last week in the Proceedings of the National Academy of Sciences. But if fisheries are not well-managed, this potential benefit turns into economic losses, as stocks decline from overfishing and further suffer from evolution.

The bad news is that today very few fisheries are managed in a way that will lead to yield increases in the long term. While these fisheries may not be in danger of collapsing, IIASA Evolution and Ecology Program Leader Ulf Dieckmann says, "There is a big difference between preventing stocks from collapsing and managing them so as to achieve an optimal harvest."

The new study, led by 2005 IIASA YSSP participant and Peccei Award winner Anna Maria Eikeset, examines Northeast Arctic cod, one of the most commercially important fisheries in the world. It builds on a growing body of work showing that fisheries-induced evolution typically leads to faster growth and earlier maturation.

These evolutionary changes may harm a fishery, since they tend to lead to smaller adult fish and could push the animals to reproduce at too early an age, when they are not yet good at it. On the other hand, the changes can also lead to greater reproduction and hence more fish. But nobody knew how these negative and positive effects balance out economically.

The new study shows that the balance depends on how aggressively a stock is fished: if the fish are harvested optimally, evolution helps, whereas if the fish are harvested too aggressively, evolution harms the economic interests of fishers and fishing nations.

Consequently, to reap these long-term benefits, fisheries managers must first cut back substantially on the amount of fish that are harvested today.

"Harvesting Northeast Arctic cod optimally means taking 50% less fish," says Dieckmann. "Our model shows that by making this substantial cut and waiting for the stock to rebuild, evolution and natural growth could lead to sustainable yields over 30% greater than today."

Reference

Eikeset, A.M., et al. 2013. Economic repercussions of fisheries-induced evolution. Proceedings of the National Academy of Sciences of the USA. July 8, 2013. Open access: http://www.pnas.org/content/early/2013/07/05/1212593110.abstract

International Institute for Applied Systems Analysis (IIASA)


Related Fisheries Current Events and Fisheries News Articles


Top marine scientists call for action on 'invisible' fisheries
To protect our oceans from irreversible harm, governments, conservationists, and researchers around the world must address the enormous threat posed by unregulated and destructive fisheries, say top marine scientists.

Global boom in hydropower expected this decade
An unprecedented boom in hydropower dam construction is underway, primarily in developing countries and emerging economies. While this is expected to double the global electricity production from hydropower, it could reduce the number of our last remaining large free-flowing rivers by about 20 percent and pose a serious threat to freshwater biodiversity.

Study: Could sleeper sharks be preying on protected Steller sea lions?
Pacific sleeper sharks, a large, slow-moving species thought of as primarily a scavenger or predator of fish, may be preying on something a bit larger - protected Steller sea lions in the Gulf of Alaska.

New study shows the importance of jellyfish falls to deep-sea ecosystem
This week, researchers from University of Hawai'i, Norway, and the UK have shown with innovative experiments that a rise in jellyfish blooms near the ocean's surface may lead to jellyfish falls that are rapidly consumed by voracious deep-sea scavengers.

Tiny travellers of the animal world: Hitchhikers on marine driftwood
A new study led by a Canadian marine zoologist reviews the world list of specialist driftwood talitrids, which so far comprises a total of 7 representatives, including two newly described species.

Britain on brink of freshwater species 'invasion' from south east Europe
Five of the most high-risk freshwater invaders from the Ponto-Caspian region around Turkey and Ukraine are now in Britain - including the quagga mussel, confirmed just two weeks ago on 1 October in the Wraysbury River near Heathrow airport.

Fish moving poleward at rate of 26 kilometers per decade
Large numbers of fish will disappear from the tropics by 2050, finds a new University of Britsh Columbia study that examined the impact of climate change on fish stocks.

River flow by design: environmental flows support ecosystem services in rivers natural and novel
Last spring, the Colorado River reached its delta for the first time in 16 years, flowing into Pacific Ocean at the Gulf of California after wetting 70 miles of long-dry channels through the Sonoran Desert.

Are Montana's invasive fish in for a shock?
A new paper from the Wildlife Conservation Society, Montana State University, Montana Department of Fish, Wildlife and Parks, and the U.S. Geological Survey looks at the feasibility of electrofishing to selectively remove invasive trout species from Montana streams as an alternative to using fish toxicants known as piscicides that effect all gill-breathing organisms.

Rating the Planet's Oceans
The most comprehensive assessment conducted by the Ocean Health Index rates the Earth's oceans at 67 out of 100 in overall health.
More Fisheries Current Events and Fisheries News Articles

Fisheries Techniques

Fisheries Techniques
by Brian R. Murphy (Author), David W. E. Willis (Author)


Book by Murphy, Brian R., Willis, David W. E.

Marine Fisheries Ecology

Marine Fisheries Ecology
by Simon Jennings (Author), Michel J. Kaiser (Author), John D. Reynolds (Author)


CLICK HERE TO DOWNLOAD ARTWORK
This topical and exciting textbook describes fisheries exploitation, biology, conservation and management, and reflects many recent and important changes in fisheries science. These include growing concerns about the environmental impacts of fisheries, the role of ecological interactions in determining population dynamics, and the incorporation of uncertainty and precautionary principles into management advice. The book draws upon examples from tropical, temperate and polar environments, and provides readers with a broad understanding of the biological, economic and social aspects of fisheries ecology and the interplay between them. As well as covering 'classical' fisheries science, the book focuses on contemporary issues such as industrial fishing,...

Modelling and Quantitative Methods in Fisheries, Second Edition

Modelling and Quantitative Methods in Fisheries, Second Edition
by Malcolm Haddon (Author)


With numerous real-world examples, Modelling and Quantitative Methods in Fisheries, Second Edition provides an introduction to the analytical methods used by fisheries’ scientists and ecologists. By following the examples using Excel, readers see the nuts and bolts of how the methods work and better understand the underlying principles. Excel workbooks are available for download from CRC Press website. In this second edition, the author has revised all chapters and improved a number of the examples. This edition also includes two entirely new chapters: Characterization of Uncertainty covers asymptotic errors and likelihood profiles and develops a generalized Gibbs sampler to run a Markov chain Monte Carlo analysis that can be used to generate Bayesian posteriors Sized-Based Models...

Fisheries Biology, Assessment and Management

Fisheries Biology, Assessment and Management
by Michael King (Author)


This excellent second edition of Fisheries Biology, Assessment and Management, has been fully updated and expanded, providing a book which is an essential purchase for students and scientists studying, working or researching in fisheries and aquatic sciences.In the same way that excessive hunting on land has threatened terrestrial species, excessive fishing in the sea has reduced stocks of marine species to dangerously low levels. In addition, the ecosystems that support coastal marine species are threatened by habitat destruction, development and pollution. Open access policies and subsidised fishing are placing seafood in danger of becoming a scarce and very expensive commodity for which there is an insatiable demand.Positive trends include actions being taken to decrease the incidental...

Four Fish: The Future of the Last Wild Food

Four Fish: The Future of the Last Wild Food
by Paul Greenberg (Author)


"A necessary book for anyone truly interested in what we take from the sea to eat, and how, and why." -Sam Sifton, The New York Times Book Review.

Writer and life-long fisherman Paul Greenberg takes us on a journey, examining the four fish that dominate our menus: salmon, sea bass, cod, and tuna. Investigating the forces that get fish to our dinner tables, Greenberg reveals our damaged relationship with the ocean and its inhabitants. Just three decades ago, nearly everything we ate from the sea was wild. Today, rampant overfishing and an unprecedented biotech revolution have brought us to a point where wild and farmed fish occupy equal parts of a complex marketplace. Four Fish offers a way for us to move toward a future in which healthy and sustainable seafood is the rule rather...

5 Easy Pieces: The Impact of Fisheries on Marine Ecosystems (The State of the World's Oceans)

5 Easy Pieces: The Impact of Fisheries on Marine Ecosystems (The State of the World's Oceans)
by Daniel Pauly (Author)


5 Easy Pieces features five contributions, originally published in Nature and Science, demonstrating the massive impacts of modern industrial fisheries on marine ecosystems. Initially published over an eight-year period, from 1995 to 2003, these articles illustrate a transition in scientific thought—from the initially-contested realization that the crisis of fisheries and their underlying ocean ecosystems was, in fact, global to its broad acceptance by mainstream scientific and public opinion.
 
Daniel Pauly, a well-known fisheries expert who was a co-author of all five articles, presents each original article here and surrounds it with a rich array of contemporary comments, many of which led Pauly and his colleagues to further study. In addition, Pauly documents how popular...

Governance of Marine Fisheries and Biodiversity Conservation: Interaction and Co-evolution

Governance of Marine Fisheries and Biodiversity Conservation: Interaction and Co-evolution
by Serge M. Garcia (Editor), Dr Jake Rice (Editor), Anthony Charles (Editor)


Governance of Marine Fisheries and Biodiversity Conservation explores governance of the world’s oceans with a focus on the impacts of two inter-connected but historically separate streams of governance: one for fisheries, the other for biodiversity conservation.  Chapters, most co-authored by leading experts from both streams, investigate the interaction of these governance streams from ecological, economic, social and legal perspectives, with emphasis on policies, institutions processes, and outcomes on scales from the global to the local community, and with coverage of a range of themes and regions of the world. 

The book opens with chapters setting the historical context for the two marine governance streams, and framing the book’s exploration of whether, as the...

Constructing Private Governance: The Rise and Evolution of Forest, Coffee, and Fisheries Certification (Yale Agrarian Studies Series)

Constructing Private Governance: The Rise and Evolution of Forest, Coffee, and Fisheries Certification (Yale Agrarian Studies Series)
by Prof. Graeme Auld (Author)


Recent decades have witnessed the rise of social and environmental certification programs that are intended to promote responsible business practices. Consumers now encounter organic or fair-trade labels on a variety of products, implying such desirable benefits as improved environmental conditions or more equitable market transactions. But what do we know about the origins and development of the organizations behind these labels? This book examines forest, coffee, and fishery certification programs to reveal how the early decisions of programs on governance and standards affect the path along which individual programs evolve and the variety and number of programs across sectors.

Stock Identification Methods, Second Edition: Applications in Fishery Science

Stock Identification Methods, Second Edition: Applications in Fishery Science
by Steven X. Cadrin (Editor), Lisa A. Kerr (Editor), Stefano Mariani (Editor)


Stock Identification Methods, 2e, continues to provide a comprehensive review of the various disciplines used to study the population structure of fishery resources. It represents the worldwide experience and perspectives of experts on each method, assembled through a working group of the International Council for the Exploration of the Sea. The book is organized to foster interdisciplinary analyses and conclusions about stock structure, a crucial topic for fishery science and management. Technological advances have promoted the development of stock identification methods in many directions, resulting in a confusing variety of approaches. Based on central tenets of population biology and management needs, this valuable resource offers a unified framework for understanding stock structure...

World Small-Scale Fisheries: Contemporary Visions

World Small-Scale Fisheries: Contemporary Visions
by Ratana Chuenpagdee (Editor)


Small-scale fisheries have received less attention in the global policy arena than their bigger counterparts, but they have much to offer the world in terms of employment, food security, and conservation. World Small-Scale Fisheries makes a new case for the importance of small-scale fisheries and provides twenty in-depth studies of businesses from around the world. An important reference book for researchers in fisheries management as well as policymakers, World Small-Scale Fisheries demonstrates the opportunities for sustainability and the remarkable strengths of small-scale fishing operations.

© 2014 BrightSurf.com