Bio-Socio-Economic Fishery Models: Labour Dynamics and Multi-Objective Management

1989 ◽  
Vol 46 (8) ◽  
pp. 1313-1322 ◽  
Author(s):  
Anthony T. Charles
Keyword(s):  
Fishery Management ◽  
Economic Modelling ◽  
Fish Stocks ◽  
Multi Objective ◽  
Net Migration ◽  
Complex Interactions ◽  
The People ◽  
Joint Dynamics ◽  
Employment Rates ◽  
External Economy

Fishery systems involve complex interactions between resource stocks and the people involved in harvesting those stocks. While the population dynamics of fish stocks have received considerable attention in the ecological literature, the dynamics of human communities dependent on the fishery are equally important. Indeed the joint dynamics of the fish stocks and the fishermen must be taken into account in determining appropriate management policies. A bio-socio-economic modelling approach is developed here to incorporate these effects within a multi-objective optimization framework. Fishery labour dynamics are determined by the decisions of individual fishermen with net migration into and out of the fishery (and hence the fishing community) dependent on internal conditions such as per capita incomes and employment rates, as well as on the state of the external economy. The task of fishery management is then one of balancing multiple objectives – such as conservation, income generation, employment, and community stability – subject to fish and fishermen dynamics. Control theory and simulation methods are used to study the bio-socio-economic dynamics of the fishery system and the interactions of multiple management are also discussed.

scholarly journals From Safety Net to Point of No Return—Are Small-Scale Inland Fisheries Reaching Their Limits?

2020 ◽  
Vol 12 (18) ◽  
pp. 7299
Author(s):  
Pina Lena Lammers ◽  
Torsten Richter ◽  
Jasmin Mantilla-Contreras
Keyword(s):  
Sustainable Management ◽  
Fishery Management ◽  
Safety Net ◽  
Small Scale ◽  
Current Function ◽  
Fish Stocks ◽  
Inland Fisheries ◽  
Point Of No Return ◽  
Agricultural Yields ◽  
Near Future

Small-scale inland fisheries (SSIF) are a livelihood opportunity for millions of people in developing countries. Understanding the economic, ecological, political and social impacts fishers are coping with can clarify weaknesses and challenges in the fishery management. Using the SSIF at Lake Alaotra, Madagascar, as an example, we analyzed the development and fishers’ perception of, and adaptation strategies to, change. We surveyed fish catches to assess the state of fish stocks and conducted interviews to understand fishers’ livelihood, problems, behavior and attitudes. Our results show that the fishery sector of Lake Alaotra has grown dramatically although fish catches have fallen sharply. Changes in species composition and low reproduction rates reflect the fishing pressure. A point of no return seems near, as decreasing agricultural yields force farmers to enter the fishery sector as a form of livelihood diversification. Lake Alaotra reflects an alarming trend which can already be seen in many regions of the world and may affect a growing number in the near future. The Alaotran fisheries demonstrate that SSIF’s ability to provide livelihood alternatives under conditions of insecurity will become increasingly important. It further highlights that the identification of ongoing livelihood dynamics in order to disclose possible poverty trap mechanisms and to understand fisheries’ current function is essential for sustainable management.

scholarly journals Human dimensions of climate change and fisheries in a coupled system: the Atlantic surfclam case

2011 ◽  
Vol 68 (6) ◽  
pp. 1354-1367 ◽  
Author(s):  
Bonnie J. McCay ◽  
Sylvia Brandt ◽  
Carolyn F. Creed
Keyword(s):  
Climate Change ◽  
Fishery Management ◽  
Coupled System ◽  
Human Dimensions ◽  
Decision Processes ◽  
Ecological System ◽  
Economic Modelling ◽  
Cognitive Frames ◽  
Marine System ◽  
Management Council

Abstract McCay, B. J., Brandt, S., and Creed, C. F. 2011. Human dimensions of climate change and fisheries in a coupled system: the Atlantic surfclam case. – ICES Journal of Marine Science, 68: 1354–1367. Research on changes in a coupled marine system of the Mid-Atlantic Bight, focusing on Atlantic surfclams and the associated fishery and management system, is reviewed for how the human dimensions of this coupled socio-ecological system are addressed by the researchers. Our foci are on economic modelling of spatial choices, using dynamic optimization with adjustments that reflect better the natural and socio-economic realities of the fishery and on ethnographic observations of decision processes, particularly those of the regional fishery management council, with particular emphasis on cognitive frames and management communities. These are designed to be integrated with and to complement biophysical modelling of the complex coupled socio-ecological system.

scholarly journals Flawed evidence supporting the Metabolic Theory of Ecology may undermine goals of ecosystem-based fishery management: the case of invasive Indo-Pacific lionfish in the western Atlantic

2016 ◽  
Vol 74 (5) ◽  
pp. 1256-1267
Author(s):  
Diego Valderrama ◽  
KathrynAnn H. Fields
Keyword(s):  
Fishery Management ◽  
Environmental Temperature ◽  
Growth Parameters ◽  
Fish Mortality ◽  
Natural Mortality ◽  
Metabolic Theory ◽  
Prey Fish ◽  
Western Atlantic ◽  
Fish Stocks ◽  
Metabolic Theory Of Ecology

Given its ability to yield predictions for very diverse phenomena based only on two parameters—body size and temperature—the Metabolic Theory of Ecology (MTE) has earned a prominent place among ecology’s efficient theories. In a seminal article, the leading proponents of the MTE claimed that the theory was supported by evidence from Pauly’s (On the interrelationships between natural mortality, growth parameters, and mean environmental temperature in 175 fish stocks. Journal Du Conseil International Pour L’Exploration de la mer 39:175–192) dataset on natural mortality, biomass, and environmental temperature for 175 fish stocks spanning tropical, temperate, and polar locations. We demonstrate that the evidence presented by the proponents of the MTE is flawed because it fails to account for the fact that Pauly re-estimated environmental temperatures for polar fish as ‘physiologically effective temperatures’ to correct for their ‘abnormally’ high natural (mass-corrected) mortalities, which on average turned out to be similar to (rather than lower than) the mortalities recorded for temperate fish. Failing to account for these modifications skews the coefficients from MTE regression models and wrongly validates predictions from the theory. It is important to point out these deficiencies given the broad appeal of the MTE as a theoretical framework for applied ecological research. In a recent application, the MTE was used to estimate biomass production rates of prey fish in a model of invasive Indo-Pacific lionfish (Pterois volitans and P. miles) predation in Bahamian reefs. We show that the MTE coefficients may lead to a drastic overestimation of prey fish mortality and productivity rates, leading to erroneous estimations of target densities for ecological control of lionfish stocks. A set of robust mortality-weight coefficients is proposed as an alternative to the MTE.

Multi-Objective Optimization of Human Resource Allocation in Production Cells with Different Training Modes

2012 ◽  
Vol 601 ◽  
pp. 521-525
Author(s):  
Cai Juan Li ◽  
Xiao Yun Wu ◽  
Xiao Dong Zhang
Keyword(s):  
Resource Allocation ◽  
Staff Training ◽  
Programming Model ◽  
Multi Objective Optimization ◽  
Multi Objective ◽  
The People ◽  
Training Mode ◽  
The Difference ◽  
Production Cell

Aiming at the difference of the people as a particularity resource。In this paper ,the personnel training mode is divided into junior and senior, and a multi-objective integer programming model is established at the lowest cost of staff training, the highest man-machine adaptability degree and minimum personnel workload. Calculating example of a real production cell is presented. The results show that the model is correct and the necessity for classification of training modes.The model can help the management to adopt reasonable training mode and achieve desirable objectives.

scholarly journals Bioeconomic model of spatial fishery management in developing countries

2012 ◽  
Vol 17 (2) ◽  
pp. 145-161 ◽  
Author(s):  
Wisdom Akpalu ◽  
Godwin K. Vondolia
Keyword(s):  
Developing Countries ◽  
Fishery Management ◽  
Marine Reserve ◽  
Social Planner ◽  
Bioeconomic Model ◽  
Ad Valorem Tax ◽  
Fish Stocks ◽  
Using Data ◽  
Spatial Externality ◽  
Distant Water Fishing

AbstractFishers in developing countries do not have the resources to acquire advanced technologies to exploit offshore fish stocks. As a result, the United Nations Convention on the Law of the Sea requires countries to sign partnership agreements with distant water fishing nations to exploit offshore stocks. However, for migratory stocks, the offshore may serve as a natural marine reserve (i.e., a source) to the inshore (i.e., sink); hence these partnership agreements generate a spatial externality. In this paper, we present a bioeconomic model in which a social planner uses a landing tax (ad valorem tax) to internalize this spatial externality. We found that the tax must reflect the biological connectivity between the two patches, intrinsic growth rate, the price of fish and cost per unit effort. The results are empirically illustrated using data on Ghana.

The Significance of Earth-Eating: Social and Cultural Aspects of Geophagy Among Luo Children

Africa ◽  
2000 ◽  
Vol 70 (4) ◽  
pp. 653-682 ◽  
Author(s):  
P. Wenzel Geissler
Keyword(s):  
Cultural Values ◽  
Social Relations ◽  
Social Practice ◽  
Reproductive Age ◽  
Primary School Children ◽  
Social Significance ◽  
Cultural Aspects ◽  
Complex Interactions ◽  
The People ◽  
Cultural Themes

ABSTRACTEarth‐eating is common among primary school children in Luoland, western Kenya. This article describes the social significance and meanings attributed to it. Earth‐eating is practised among children before puberty, irrespective of their sex, and among women of reproductive age, but not usually among adult men or old women. To eat earth signifies belonging to the female sphere within the household, which includes children up to adolescence. Through eating earth, or abandoning it, the children express their emerging gender identity. Discourses about earth‐eating, describing the practice as unhealthy and bad, draw on ‘modern’ notions of hygiene, which are imparted, for example, in school. They form part of the discursive strategies with which men especially maintain a dominant position in the community. Beyond the significance of earth‐eating in relation to age, gender and power, it relates to several larger cultural themes, namely fertility, belonging to a place, and the continuity of the lineage. Earth symbolises female, life‐bringing forces. Termite hills, earth from which is eaten by most of the children and women, can symbolise fertility, and represent the house and the home, and the graves of ancestors. Earth‐eating is a form of ‘communion’ with life‐giving forces and with the people with whom one shares land and origin. Earth‐eating is a social practice produced in complex interactions of body, mind and other people, through which children incorporate and embody social relations and cultural values.

scholarly journals A mezőgazdasági foglalkoztatottság regionális jellemzői

2010 ◽  
Vol 5 (1-2) ◽  
pp. 106-109
Author(s):  
Péter Karácsony
Keyword(s):  
Social Problems ◽  
Technical Development ◽  
Cultural Services ◽  
Agricultural Employment ◽  
The People ◽  
Employment Rates

Employment in agricultural services has always been affected by politics, by technical development etc. These facts caused more and more people rapidly lose their jobs in agri-cultural services within the last several years. Due to the above mentioned affects, two-third of the people working with agriculture was forced to give up their jobs. Many people lost their jobs in the country which caused deep social problems (fewer inhabitants in villages). During my researches, I evaluated at the agricultural employment rates in Hungary.

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