scholarly journals Sustaining Food Production: Fisheries Management Options for Lake Ardibo, Northern Ethiopia

2019 ◽  
Vol 4 (1) ◽  
pp. 14
Author(s):  
Wubshet Asnake Metekia
Keyword(s):  
Fisheries Management ◽  
Food Production ◽  
Northern Ethiopia ◽  
Management Options

Multiattribute Analysis and the Concept of Optimum Yield

1984 ◽  
Vol 41 (9) ◽  
pp. 1393-1406 ◽  
Author(s):  
M. C. Healey
Keyword(s):  
Decision Analysis ◽  
Fisheries Management ◽  
Social Factors ◽  
The United States ◽  
Operational Definition ◽  
Clupea Harengus ◽  
Management Options ◽  
Optimum Yield ◽  
Wide Range ◽  
Skeena River

This paper reviews the origin and operational definition of the optimum yield (OY) concept and demonstrates how techniques of decision analysis can provide an analytical model for OY. The concept of OY was formalized as the guiding principle of fisheries management in the United States and Canada in 1976. The policies of both countries make it clear that a wide range of biological, economic, and social factors are to be taken into account in determining OY. Confusion exists, however, about precisely which of these factors should determine OY in any fishery and what is their relative importance. Uncertainty also exists about how to take biological, economic, and social factors jointly into account as the concept of OY implies one must. Established biological and economic models in fisheries are not adequate for such an analysis because their focus is single- rather than multi-objective. Operational techniques of decision analysis, such as multiattribute utility analysis, are specifically designed to deal with multiobjective problems like OY. I propose that a simple, linear, utility model be used to assess the optimality of alternative yield strategies in fisheries management. I illustrate the application of the model by assessing OY options in the New England herring (Clupea harengus) fishery and the Skeena River salmon (Oncorhynchus spp.) fishery. The advantages of the model are that it is simple and intuitively appealing, that it permits a wide range of types and qualities of data to be incorporated into the evaluation of management options, that it is amenable to sensitivity analysis, and that it is adaptable to a variety of decision rules.

A fisheries management success story: the Gisborne, New Zealand, fishery for red rock lobsters (Jasus edwardsii)

1997 ◽  
Vol 48 (8) ◽  
pp. 1103 ◽  
Author(s):  
Paul A. Breen ◽  
Terese H. Kendrick
Keyword(s):  
Fisheries Management ◽  
Unit Price ◽  
Success Story ◽  
Management Options ◽  
Structured Model ◽  
Jasus Edwardsii ◽  
Fishery Data ◽  
Catch Rates ◽  
Related Mortality ◽  
Future Management

After individual quotas were imposed in 1990, the fishery for Jasus edwardsii in the Gisborne area showed continuing declines in catch and catch rate to 1993, and the total quota could not be caught in this area. There were few legal-sized but many sublegal-sized lobsters. Pots caused mortality of sublegal lobsters through handling, pot-related Octopus predation, and thefts from commercial pots. The industry, in conjunction with recreational fishers and Maori, developed a scheme to address these problems. The aim was to increase landed value to compensate for quota reductions, and to do this by landing more lobsters in winter (when prices were higher) and landing smaller lobsters (which had a higher unit price). A shortened season was designed to reduce pot-related mortality. Part of the scheme—a proposal to reduce the minimum legal size of male lobsters—caused controversy. However, the package was evaluated with a simple model and then accepted by the Minister of Fisheries. Results were substantially increased catch rates since 1993, a successful shift to a winter fishery, and a shift in length frequencies toward larger sizes. A simple size-structured model fitted to the fishery data and used to evaluate future management options is also described.

Fisheries management on Lake Victoria at a crossroads: Assessing fishers’ perceptions on future management options in Uganda

2021 ◽  
Author(s):  
Veronica Mpomwenda ◽  
Daði Mar Kristófersson ◽  
Anthony Taabu‐Munyaho ◽  
Tumi Tómasson ◽  
Jón Geir Pétursson
Keyword(s):  
Fisheries Management ◽  
Lake Victoria ◽  
Management Options ◽  
Future Management

scholarly journals Highly mixed fisheries: fine-scale spatial patterns in retained catches of French fisheries in the Celtic Sea

2016 ◽  
Vol 74 (1) ◽  
pp. 91-101 ◽  
Author(s):  
Maria Mateo ◽  
Lionel Pawlowski ◽  
Marianne Robert
Keyword(s):  
Spatial Patterns ◽  
Fisheries Management ◽  
Principal Component ◽  
Ecosystem Approach ◽  
Fine Scale ◽  
Biological Interactions ◽  
Management Options ◽  
Fishing Activity ◽  
Fisheries Policy ◽  
Celtic Sea

Efficiency of mixed-fisheries management and operational implementation of the ecosystem approach to fisheries management rely on the ability to understand and describe the technical and biological interactions between fleets, gears and species. The present study aims to describe fine-scale spatial patterns of the French demersal mixed fisheries in the Celtic Sea and discusses their implications in terms of management. Analysis was made by integrating vessel monitoring systems and logbook data collected between 2010 and 2012 at a 3′*3′ spatial scale through the use of principal component analysis followed by hierarchical clustering. It revealed spatial regions defined by a distinct homogeneous composition of retained catches. Each cluster was also described in terms of the fishing activity: vessel length, effort, power and gear used. The analysis revealed a complex spatial structure in the species assemblage caught and suggests that a single situation cannot describe the mixed fisheries of the Celtic Sea, but rather that there are several distinct cases of mixed fisheries. Our results also highlight the limitations of using the current level of data aggregation commonly requested in international data calls to model these fisheries and suggest that improvements should be made to ensure efficient evaluation of management options. Analyses of spatially resolved fisheries data such as the one presented here open a range of potential applications. In the context of the Common Fisheries Policy reform and the landing obligation, comparison of our results with applications of the same methodology to a subset of vulnerable species or to catches of fish below the minimum conservation reference size would help to identify the geographical areas to avoid and assess potential effort reallocation strategies based on groups of target species.

scholarly journals Augmenting Marine Food Production Through Fisheries Management and Mariculture

2019 ◽  
Vol 6 (2) ◽  
Author(s):  
S M Sharifuzzaman ◽  
M I Golder ◽  
M. Shahadat Hossain
Keyword(s):  
Fisheries Management ◽  
Food Production ◽  
Marine Food

Impacts of historical warming on marine fisheries production

Science ◽  
2019 ◽  
Vol 363 (6430) ◽  
pp. 979-983 ◽  
Author(s):  
Christopher M. Free ◽  
James T. Thorson ◽  
Malin L. Pinsky ◽  
Kiva L. Oken ◽  
John Wiedenmann ◽  
...  
Keyword(s):  
Climate Change ◽  
Fisheries Management ◽  
Food Production ◽  
Maximum Sustainable Yield ◽  
Marine Fishes ◽  
Sustainable Yield ◽  
Food Provisioning ◽  
Temperature Dependent ◽  
Potential Food

Climate change is altering habitats for marine fishes and invertebrates, but the net effect of these changes on potential food production is unknown. We used temperature-dependent population models to measure the influence of warming on the productivity of 235 populations of 124 species in 38 ecoregions. Some populations responded significantly positively (n = 9 populations) and others responded significantly negatively (n = 19 populations) to warming, with the direction and magnitude of the response explained by ecoregion, taxonomy, life history, and exploitation history. Hindcasts indicate that the maximum sustainable yield of the evaluated populations decreased by 4.1% from 1930 to 2010, with five ecoregions experiencing losses of 15 to 35%. Outcomes of fisheries management—including long-term food provisioning—will be improved by accounting for changing productivity in a warmer ocean.

“Risk” in fisheries management: a review

1997 ◽  
Vol 54 (8) ◽  
pp. 1699-1715 ◽  
Author(s):  
RICC Francis ◽  
R Shotton
Keyword(s):  
Risk Assessment ◽  
Risk Management ◽  
Fisheries Management ◽  
Management Options ◽  
Precautionary Approach ◽  
Alternative Management ◽  
Second Stage ◽  
Management Literature ◽  
Technical Details ◽  
Two Stages

``Risk'' has appeared more frequently in the fisheries management literature in recent years. The reasons for this are partly internal (scientists seeking better ways to advise fishery managers) and partly external (e.g., adoption of the precautionary approach). Though terminology varies, there is consensus that there are two stages in dealing with risk. The first (here called risk assessment) is the formulation of advice for fisheries managers in a way that conveys the possible consequences of uncertainty. This advice is in the form of an evaluation of the expected effects of alternative management options, rather than recommendations. Risk assessment has been undertaken in many fisheries, and there is general agreement as to how it should be done (although technical details differ). The second stage (risk management) is the way fishery managers take uncertainty into account in making decisions. Much fisheries risk management is informal, i.e., nonquantitative, undocumented, and loosely linked (if at all) with a risk assessment. The major reason for this is that the objectives of fisheries management are often conflicting and are rarely stated in a way that provides explicit direction to managers or scientists.

scholarly journals The trade-off between biodiversity and sustainable fish harvest with area-based management

2020 ◽  
Author(s):  
Ray Hilborn ◽  
Caitlin Allen Akselrud ◽  
Henry Peterson ◽  
George A Whitehouse
Keyword(s):  
Fisheries Management ◽  
Food Production ◽  
Effective Area ◽  
Fishing Effort ◽  
Sustainable Food ◽  
Trade Off ◽  
Sustainable Food Production ◽  
High Conservation ◽  
Impact On Biodiversity ◽  
Fish Harvest

Abstract While fisheries provide food and employment for hundreds of millions of people, they also can have significant impact on biodiversity. We explore the potential of area-based fisheries management to simultaneously maintain biodiversity and high levels of sustainable food production. We used two illustrative examples of fisheries that have different gear types, areas, and species to evaluate the trade-off between biodiversity and harvest. We calculate the optimal effort by gear and area that maximizes a weighted objective function of biodiversity and harvest, ranging from 100% of the weight on harvest to 100% on biodiversity. We found for both case studies that the trade-off was highly convex, with win–win solutions allowing for high levels of both fishery harvest and conservation. This is achieved by reducing or eliminating fishing effort that negatively impacts high conservation value species while maintaining fishing effort with gears and in areas where there is low conservation impact. We suggest that, in most fisheries, such situations can be found and that effective area-based management can provide for high levels of biodiversity protection and food production.

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