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

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.

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.

scholarly journals The syndrome of inappropriate antidiuretic hormone: current and future management options

2010 ◽  
Vol 162 (Suppl1) ◽  
pp. S13-S18 ◽  
Author(s):  
Mark Sherlock ◽  
Chris J Thompson
Keyword(s):  
Antidiuretic Hormone ◽  
Treatment Options ◽  
Fluid Restriction ◽  
Efficacy And Safety ◽  
Electrolyte Abnormality ◽  
Management Options ◽  
Appropriate Treatment ◽  
The Cost ◽  
Underlying Pathophysiology ◽  
Future Management

Hyponatraemia is the commonest electrolyte abnormality, and syndrome of inappropriate antidiuretic hormone (SIADH) is the most frequent underlying pathophysiology. Hyponatraemia is associated with significant morbidity and mortality, and as such appropriate treatment is essential. Treatment options for SIADH include fluid restriction, demeclocycline, urea, frusemide and saline infusion, all of which have their limitations. The introduction of the vasopressin-2 receptor antagonists has allowed clinicians to specifically target the underlying pathophysiology of SIADH. Initial studies have shown good efficacy and safety profiles in the treatment of mild to moderate hyponatraemia. However, studies assessing the efficacy and safety of these agents in acute severe symptomatic hyponatraemia are awaited. Furthermore, the cost of these agents at present may limit their use.

Current and Future Fisheries Management Goals: Implications for Future Management

Fisheries ◽  
1978 ◽  
Vol 3 (1) ◽  
pp. 10-14 ◽  
Author(s):  
David H. Bennett ◽  
Ed L. Hampton ◽  
Robert T. Lackey
Keyword(s):  
Fisheries Management ◽  
Future Management

scholarly journals Bipolar I disorder: current and future management options

2011 ◽  
Vol 12 (3) ◽  
pp. 14-17
Author(s):  
Eduard Maron ◽  
Allan H Young
Keyword(s):  
Management Options ◽  
Bipolar I Disorder ◽  
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.

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