SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Pelletier, Dominique; Mahevas, Stephanie; Drouineau, Hilaire; Vermard, Youen; Thebaud, Olivier; Guyader, Olivier; Poussind, Benjamin.

In order to provide reliable scientific advice and support for fisheries management, it is necessary to evaluate the biological and economic sustainability of complex fisheries, such as multi-species multi-fleet fisheries. Existing policy-screening modelling tools are not fully suitable in this purpose due to either an over-simplified description of population dynamics, or due to the lack of consideration of economic aspects. In this paper, we present a package that enables quantitative bioeconomic assessment of management scenarios. Population dynamics is described through spatially- and seasonally-explicit models. Exploitation dynamics is characterized by several fishing activities with specific spatial and seasonal features, and practiced by several...

Tipo: Text

Palavras-chave: Policy screening; Natural resource management; Fisheries dynamics; Bioeconomic model; Population dynamics; Complex systems; Simulation tool.

Ano: 2009

URL: http://archimer.ifremer.fr/doc/2009/publication-6782.pdf

A bioeconomic analysis of the impact of decommissioning programs: Application to a limited-entry french scallop fishery

Guyader, Olivier; Daures, Fabienne; Fifas, Spyros.

The objective of this paper is to assess the benefits and costs of decommissioning policies aimed at reducing fleet capacity through premiums offered by the public authority to fishermen to scrap their vessels. A case study, the limited entry scallop fishery of the Saint Brieuc Bay, France, is used to con- sider the problem of excess capacity and to model the bioeconomic consequences of disinvestment behavior. Special attention is paid to the assessment of fishermen's willingness to leave the fishery and to the implementation of public policy in terms of budget level and premiums offered to the fishermen. Spreadsheet simulations show that the impact of decommissioning programs is positive in terms of net surplus, even in the case of increasing technical...

Tipo: Text

Palavras-chave: Fishing capacity; Decommissioning programs; Premium; Willingness to leave; Bioeconomic model; Cost-benefit analysis.

Ano: 2004

URL: https://archimer.ifremer.fr/doc/00243/35449/33977.pdf

Influence of water temperature on the economic value of growth rate in fish farming: The case of sea bass (Dicentrarchus labrax) cage farming in the Mediterranean

Evaluating deepwater fisheries management strategies using a mixed-fisheries and spatially explicit modelling framework

Besson, M.; Vandeputte, Marc; Van Arendonk, J. A. M.; Aubin, J.; De Boer, I. J. M.; Quillet, E.; Komen, H..

In sea cage farming, fish are exposed to seasonal variations of water temperature, and these variations can differ from one location to another. A small increase in water temperature does not only stimulate growth of the fish (until an optimal level) but also lowers dissolved oxygen concentration in water. Dissolved oxygen may then become a rearing constraint during the production cycle if the oxygen requirement of fish is higher than the supply. The impact of this constraint on production parameters (stocking density of cages and/or batch rotation) and thus on economic profit of a farm will depend on both local thermal regime and growth potential of the fish. Increased growth is one of the most important traits in a breeding objective to increase...

Tipo: Text

Palavras-chave: Economic values; Bioeconomic model; Fish farming; Genetic improvement; Temperature; Thermal growth coefficient.

Ano: 2016

URL: http://archimer.ifremer.fr/doc/00332/44361/43964.pdf

Marchal, Paul; Vermard, Youen.

Wehave used in this study a spatially explicit bioeconomic modelling framework to evaluate management strategies, building in both datarich and data-limited harvest control rules (HCRs), for a mix of deepwater fleets and species, on which information is variable. The main focus was on blue ling (Molva dypterygia). For that species, both data-rich and data-limited HCRs were tested, while catch per unit effort (CPUE) was used either to tune stock assessments, or to directly trigger management action. There were only limited differences between the performances of both HCRs when blue ling biomass was initialized at the current level, but blue ling recovered more quickly with the data-rich HCR when its initial biomass was severely depleted. Both types of HCR...

Tipo: Text

Palavras-chave: Bioeconomic model; Catch per unit effort; Fleet dynamics; Harvest control rules; Management strategy evaluation; Mixed fisheries.

Ano: 2013

URL: http://archimer.ifremer.fr/doc/00151/26229/24330.pdf

Estimation of technical interactions due to the competition for resource in a mixed-species fishery, and the typology of fleets and metiers in the English Channel

Ulrich, Clara; Gascuel, Didier; Dunn, Matthew R; Le Gallic, Bertrand; Dintheer, Christian.

In a multi-gear and multi-species artisanal fishery, the level of technical interactions (i.e. the competitive externalities resulting from a shared exploitation of common resources or fishing grounds) among various fishing units is high. Assessing these technical interactions is of great importance for fishery management, as any control applied to one fishing unit may have positive or negative effects on others. The magnitude and direction of these effects cannot be easily measured, unless all fishing units and species in the fishery are considered simultaneously. Technical interactions are particularly important in the complex artisanal fisheries of the English Channel. Using a bioeconomic model of the English Channel that incorporates all the major...

Tipo: Text

Palavras-chave: Modèle bioéconomique; Compétition; Externalités de stock; Interactions techniques; Typologie; Manche; Bioeconomic model; Competition; Stock externalities; Technical interactions; Typology; English Channel.

Ano: 2001

URL: https://archimer.ifremer.fr/doc/00187/29874/28363.pdf

An Economic Analysis to Sustainable Fisheries Management

OceanDocs

Lokina, R.B..

The coastal zone is a dynamic area surrounding the interface between land and sea. The coastal area and its resources offer great benefits and opportunities for human use. Most coastal activities in Tanzania rely on the natural resources that the coast offers (fishing, forestry, agriculture, tourism, mining, salt production mariculture etc). Therefore the condition of the coastal ecosystem and social well being are closely linked. The challenge is to maintain and improve the resources base on which those activities are dependent, while developing new economic opportunities in a way that benefits the people of the coast and the nation as a whole. A major constraint is the inadequate institution and legal framework for coastal management. Economics is about...

Tipo: Conference Material

Palavras-chave: Maximum economic yield; Open access equilibrium; Efficiency; Artisan fisheries; Maximum sustainable yield; Bioeconomic model; Sustainable fishing; Sustainable management.

Ano: 2000

URL: http://hdl.handle.net/1834/746

Economically optimal management strategies for the South Georgia Patagonian toothfish fishery

Hoshino, Eriko; Hillary, Richard M..

The fishery for Patagonian toothfish (Dissostichus eleginoides) around the island of South Georgia in the Southern Ocean is a profitable operation targeting a high-value, slow-growing species. We substituted the complex Bayesian age-structured model currently used for assessments with a Schaefer production model, which performs equally well as an operating model for management strategy evaluation. A number of potential effort reduction strategies are investigated, several of which would achieve better conservation objectives and higher future profits from the fishery than those predicted using the current management strategy. The article also discusses the applicability of this approach to the Australian sub-Antarctic fisheries targeting the stocks of D....

Economic analysis of integrated weed management strategies for annual barnyardgrass (Echinochloa crus-galli complex) in Philippine rice farming systems

Palavras-chave: Bioeconomic model; Fisheries; Patagonian toothfish; Management strategy evaluation; Resource /Energy Economics and Policy.

Ano: 2011

URL: http://purl.umn.edu/100562

Beltran, Jesusa C.; Pannell, David J.; Doole, Graeme J.; White, Benedict.

This paper describes a dynamic simulation model that has been developed to provide a comprehensive assessment of integrated weed management programmes for the control of annual barnyardgrass (Echinochloa crus-galli complex) in Philippine rice farming systems. The main outputs of the model include weed seed and plant densities and seasonal and annualised profit over the simulated planning horizon. Model output emphasises the substantial economic benefits associated with effective long-term weed management strategies. In addition, a mixture of chemical and non-chemical treatments provides good weed control in rice crops, and maximises long-term profit for systems where the main weed is annual barnyardgrass. However, the performance of this strategy is...

Tipo: Presentation

Palavras-chave: Barnyardgrass; Bioeconomic model; Integrated weed management; Rice farming systems.; Crop Production/Industries.

Ano: 2012

URL: http://purl.umn.edu/124236

The value of refugia in managing anthelmintic resistance: a modelling approach

Pech, Caris L.; Doole, Graeme J.; Pluske, Johanna M..

The increasing prevalence of anthelmintic (drench) resistance in gastrointestinal parasite populations is decreasing the profitability of the sheep industry in Western Australia (WA). A strategy, referred to as refugia management, has the potential to delay the development of resistant parasites by not exposing a proportion of the worm population to chemical control. A dynamic bioeconomic model is used to assess the economic value of refugia for management of the worm species Teladorsagia circumcincta and Macrocyclic Lactone drenches in Western Australian sheep flocks. A low rate of refugia (2 per cent) is most profitable under standard circumstances because it slows the development of resistance, but also reduces the cost accruing to production losses...

Economic Issues in the Management of Plants Invading Natural Environments: Scotch Broom in Barrington Tops National Park

Palavras-chave: Anthelmintic resistance; Bioeconomic model; Gastrointestinal parasites; Refugia; Sheep; Teladorsagia circumcincta..

Ano: 2009

URL: http://purl.umn.edu/48166

Odem, Doreen; Sinden, Jack A.; Cacho, Oscar J.; Griffith, Garry R..

Scotch broom (Cytisus scoparius, L.), is an exotic leguminous shrub, native to Europe, which invades pastoral and woodland ecosystems and adjoining river systems in cool, high rainfall regions of southeastern Australia. Broom has invaded 10,000 hectares of eucalypt woodland at Barrington Tops National Park in New South Wales, and is having a major impact on the natural ecology of the sub-alpine environment. It is extremely competitive with the native flora, retarding their growth and in many areas blanketing the ground and preventing growth of many understorey species in open forest areas. An active program to manage this invasion is being implemented by the National Parks and Wildlife Service. The management issues include whether eradication or...

A bioeconomic model for determining the optimal response to a new weed incursion in Australian cropping systems

Palavras-chave: Scotch broom; Economic issues; Management issues; Natural environments; Bioeconomic model; Environmental Economics and Policy.

Ano: 2003

URL: http://purl.umn.edu/58193

Jayasuriya, Rohan T.; Jones, Randall E..

Invasions by non-indigenous plant species pose serious economic threats to Australian agricultural industries. When an invasion is discovered a decision has to be made as to whether to attempt to eradicate it, contain it or do nothing. These decisions should be based on long term benefits and costs. This paper describes a bioeconomic simulation framework with a mathematical model representing weed spread linked to a dynamic programming model to provide a means of determining the economically optimal weed management strategies over time. The modelling framework is used to evaluate case study invasive weed control problems in the Australian grains industry.

RIMPhil: a bioeconomic model for integrated weed management of annual barnyardgrass (Echinochloa crus-galli) in Philippine rice farming systems

Palavras-chave: Weeds; Incursion; Bioeconomic model; Crop Production/Industries; Research Methods/ Statistical Methods.

Ano: 2008

URL: http://purl.umn.edu/6015

Beltran, Jesusa C.; Pannell, David J.; Doole, Graeme J.; White, Benedict.

This paper describes a complex, dynamic simulation model that has been developed for the analysis of integrated weed management programmes for the control of annual barnyardgrass (Echinochloa crus-galli) in rice farming systems in the Philippines. Users of the model may simulate any feasible combination of 49 weed treatments options across wet and dry cropping seasons over 5, 10, 15, and 20 year periods, subject to a predetermined sequence of planting methods. The main outputs of the model include weed seed and plant densities and seasonal and annualised profit over the simulated planning horizon. Model output emphasises the substantial economic benefits associated with effective long-term weed management strategies. In addition, the most-profitable weed...

Tipo: Working or Discussion Paper

Palavras-chave: Barnyardgrass; Bioeconomic model; Integrated weed management; Rice farming systems.; Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy; Farm Management.

Ano: 2011

URL: http://purl.umn.edu/104637

A Bioeconomic Model of the Soybean Aphid Treatment Decision in Soybeans

Olson, Kent D.; Badibanga, Thaddee Mutumba.

Since its first detection in the North Central region in July 2000, the soybean aphid (Aphis glycines Matsamura) has caused considerable loss in soybean (Glycine max L.) yield, bean quality, and producer income. Discovered first in Wisconsin and then in adjoining states, it is currently distributed in 21 US states and parts of Canada. In 2003, over 42 million acres of soybean in the North Central US were infested and over 7 million acres were treated with insecticides to control soybean aphid (Landis et al. 2003). Populations exceeding 24,000 aphids per plant and 40% losses in seed yield have been reported (DiFonzo & Hines 2002). Even prior to the outbreak of 2003, the Soybean Strategic Pest Management Plan identified soybean aphid as one of the key...

Marine Reserves Switching under Uncertainty

Palavras-chave: Soybean aphid; Bioeconomic model; Farm Management.

Ano: 2005

URL: http://purl.umn.edu/19237

Yamazaki, Satoshi.

This paper analyses a fisheries management strategy, marine reserves switching, in which a non-fishing area is created, removed, or rotated from one site to another according to economic criteria through time. Using a dynamic optimisation framework under uncertainty, with the different fish dispersal processes, the optimal switching strategy and density distributions of the biomass, harvest, and net profit are simulated and compared under different management scenarios. This study will provide a decision and modelling framework for the design of marine reserves to achieve desired management goals.

FEASIBILITY OF INTEGRATING SHEEP AND CROPS WITH SMALLHOLDER RUBBER PRODUCTION SYSTEMS IN INDONESIA

Palavras-chave: Bioeconomic model; Fisheries management; Marine reserves; Uncertainty; Resource /Energy Economics and Policy; Risk and Uncertainty; Q22.

Ano: 2008

URL: http://purl.umn.edu/6003

Deaton, Brady J.; San, Nu Nu.

Diversified production systems are considered important tools for stabilizing the income of smallholder rubber producers in Indonesia. Based on empirical data collected from smallholder rubber producers in the Nucleus Estate Smallholder (NES) development project, estimations were made of the economic feasibility of integrating sheep and selected crops into smallholder rubber production plantations. The dynamic optimization procedure is used as an evaluation technique. This study finds that integration of sheep and crops into smallholder rubber production is economically feasible, particularly for those who utilize family labor for hand harvesting grass and grazing sheep. Integrating sheep alone increases the net present value of future income by 20%....

Tipo: Journal Article

Palavras-chave: Bioeconomic model; Diversification; Dynamic optimization; Indonesia; Rubber; Sheep; Smallholder; Farm Management.

Ano: 1999

URL: http://purl.umn.edu/14727

Economic impacts of high labour cost and herbicide resistance for the management of annual barnyardgrass (Echinochloa crus-galli) in rice production in the Philippines

Beltran, Jesusa C.; Pannell, David J.; Doole, Graeme J..

Implications of increasing labour cost and development of herbicide resistance for profitable weed management in Philippine rice farming systems are investigated. The study employs RIMPhil (Resistance and Integrated Management in the Philippines), a bioeconomic simulation model developed to provide a comprehensive assessment of integrated weed management programmes for the control of annual barnyardgrass (Echinochloa crus-galli) in rice crops. Results indicate that herbicide application will become increasingly economically attractive, relative to manual weeding, as labour cost increases. This is important since urban migration in the Philippines continues to increase the scarcity of rural labour. Results also show that the onset of herbicide resistance...

Tipo: Working or Discussion Paper

Palavras-chave: Barnyardgrass; Bioeconomic model; Herbicide resistance; Integrated weed management; Rice production; Crop Production/Industries; Farm Management; Research and Development/Tech Change/Emerging Technologies.

Ano: 2011

URL: http://purl.umn.edu/108770

Atlantic Salmon Fishery in the Baltic Sea – A Case of Trivial Cooperation

Kulmala, Soile; Levontin, Polina; Lindroos, Marko; Pintassilgo, Pedro.

This paper analyses the management of the Atlantic salmon stocks in the Baltic Sea through a coalition game in the partition function form. The signs of economic and biological over-exploitation of these salmon stocks over the last two decades indicate that cooperation among the harvesting countries, under the European Union's Common Fisheries Policy, has been superficial. Combining a two-stage game of four asymmetric players with a comprehensive bioeconomic model, we conclude that cooperation under the Relative Stability Principle is not a stable outcome. In contrast, the equilibrium of the game is non-cooperation. The paper also addresses the possibility of enhancing cooperation through more flexible fishing strategies. The results indicate that partial...

Bioeconomic Evaluation of Substitution of Balanced Feed with Chaya (Cnidoscolus Chayamansa) Leaves in Tilapia Production

Palavras-chave: Atlantic salmon; Bioeconomic model; Coalition formation; Partition function; Sharing rules; Stability analysis; Research and Development/Tech Change/Emerging Technologies.

Ano: 2010

URL: http://purl.umn.edu/59094

Poot-Lope, Gaspar Roman; Gasca-Leyva, Eucario.

In Mexico, the culture of tilapia has developed in rural areas, where the main problem is low producer income. The state of Yucatan also experiences this situation, and scarcity of money needed to purchase inputs results in complementary feeding with chaya (Cnidoscolus chayamansa), whose leaves are edible for humans and animals. In this situation, CINVESTAV conducted experiments to determine the optimal level of substitution of balanced feed with ray chaya leaves. The test with 25% and 50% reduced balanced feed complemented with chaya (ad libitum) did not show significant differences (P>0.05) in growth compared to fishes fed with a complete ration of balanced feed (100% feed table). A bioeconomic model was developed, including a submodel of growth...

Weather and Wethers: effects of wind, temperature and rain on sheep feedlot production

Palavras-chave: Bioeconomic model; Cost minimization; Tilapia; Livestock Production/Industries; O13; Q22.

Ano: 2005

URL: http://purl.umn.edu/55999