Posts Tagged ‘fisheries management’

Harvest control rules in modern fisheries management

August 5, 2016

My latest paper is joint work with a rather large group of people. We met at a workshop two years ago, and after interesting and fruitful discussions, we decided to write a paper based on our work there. After a long and winding process, the paper is now published in the open-access journal ElementaThe abstract reads as follows:

Harvest control rules have become an important tool in modern fisheries management, and are increasingly adopted to provide continuity in management practices, to deal with uncertainty and ecosystem considerations, and to relieve management decisions from short-term political pressure. We provide the conceptual and institutional background for harvest control rules, a discussion of the structure of fisheries management, and brief introductions to harvest control rules in a selection of present day cases. The cases demonstrate that harvest control rules take different forms in different settings, yet cover only a subset of the full policy space. We conclude with views on harvest control rules in future fisheries management, both in terms of ideal and realistic developments. One major challenge for future fisheries management is closing the gap between ideas and practice.

The paper is part of the special feature Climate change impacts: Fish, fisheries, and fisheries management:

The atmosphere and oceans are warming, seasonal sea ice is retreating and salinity and ocean circulation patterns are changing, all of which can impact fish populations. Largely using comparative analyses, this Special Feature examines some of the effects of climate changes on fish stocks in the northern hemisphere, particular in the Northeast Atlantic and around the continental United States. It considers what marine ecosystems may look like under anthropogenic climate change and how existing fisheries management strategies, such as Harvest Control Rules, may fare in the future. It also notes some potential economic and societal consequences of climate change.



Do Species Interactions and Stochasticity Matter to Optimal Management of Multispecies Fisheries?

December 4, 2012

Earlier this year, the research team I am a part of (the BMAME-team) published a chapter in the book Global Progress in Ecosystem-Based Fisheries Management, edited by G. H. Kruse and others. The chapter has the winding title Do Species Interactions and Stochasticity Matter to Optimal Management of Multispecies Fisheries?, and is authored by Diwakar Poudel, Leif K. Sandal, Stein I. Steinshamn, and myself. The answer to the question in the title is a resounding It Depends. The abstract:

GlobalProgressFrontMultispecies fisheries management looks at a bigger picture in addressing the long-term consequences of present decisions. This implies an ecosystem management that includes a number of species and their physical, biological, and economic interactions. These interactions make the growth of resources stochastic and increase complexity in understanding stock dynamics and optimal catch for such a stochastic and multiple-stock system. To address the issue of identifying optimal catch of stochastically growing multi stocks, we have formulated and applied a time-continuous stochastic model. The model contributes to multispecies bioeconomic management of marine ecosystems. An application of the model in a predator-prey relationship in the Barents Sea revealed that the optimal catch for stochastically growing stocks in a multispecies interaction model is different from the deterministic model.