The geoduck fishery in British Columbia has been managed by individual quotas since 1989. Individual
quotas have fostered a co-operative management approach in the fishery, which is implemented through a
non-profit society with membership made up of licence holders in the fishery. This non-profit society, the
Underwater Harvesters Association (UHA),...
Assuming externalities from aquaculture to fisheries, we use a Verhulst-Schaefer model of fish
population-dynamics and production, coupled with an aquaculture production model, to investigate
effects on open-access and rent-maximising fisheries. Externalities are modelled by letting carrying
capacity, intrinsic growth rate or catchability coefficient in the fishery depend on aquaculture production....
This paper sets out an evaluation of profitability differentials within shellfish farming activities of the
Mont-Saint-Michel Bay. The objective is to examine whether profitability differentials have
consequences in terms of economic dynamics and of management arrangements. The paper divides into
four parts. The first part presents a retrospective analysis of...
The advent of scientific shrimp farming in India during 1990-91 was a turning point of shrimp production
in the country. Though scientific shrimp farming system renders higher level of production than the
existing traditional farming system, it is subject to certain criticisms especially for generating negative
environmental externalities. The conversion...
The exploitation of aquatic food products has been very fundamental as a source of livelihood in
the Sub Saharan Africa in particular and the world in general. Global production of aquatic food
products totaled approximately 93.2 million metric tons in 1997 and sub Saharan Africa
contributed 3.7 per cent. For...
In natural resource economics, we sometimes observe a situation in which producers and consumers have
direct access to the factors of production or can use some consumable products with little or no
transformation. These goods are commonly referred to as “gifts of nature”. A factor of production is
considered a...
The success or failure of aquaculture heavily depends on how effectively to manage aquatic animal
diseases. In order to analyze the economic effects of aquatic animal disease control, the specific factors
and magnitudes of benefits and costs are identified with and without the proposed project for the disease
control. These...
A bio-economic model, based on Faustmann rotation, was developed to analyze the relevance of
removing thinning activities which are part of the dominant technology used in blue mussel production in
Canada. Removing these density control activities (thinning) seemed a profitable option to producers. It
was thought that this collector line...
Economists have generated numerous studies analyzing how a move to rights-based fishery management from open-access management affects fish harvesters' behavior. Conversely, the impacts that such a change in management can have on fish processors has received relatively little attention. This paper presents a simple two-product processor supply model to show...
Wholesale demand systems for live reef food fish in Hong Kong are analysed using the Linear Approximate Almost Ideal Demand System (LA/AIDS). Results suggest that price elasticities of demand are inelastic, with relatively high-valued species exhibiting greater elasticity than relatively low-valued species. Cross price elasticities are negative suggesting that different...
Shrimp farming in Iran is one of the fast growing segments of the economy. In 1994, around 1%
of Iranian shrimp production was farmed and by 2003 the share of shrimp farming increased to
60%. In spite of the fact that shrimp culture had relatively rapid growth in last decade,...
A community based sea urchin (Tripneustes gratilla) culture was chosen as an alternative livelihood by
fisherfolks of Nalvo, a fishing village along the South China Sea in Sta. Maria, Ilocos Sur, Philippines.
The sea urchin culture was adopted among fishermen to augment their rapidly declining income from
fishing. The said...
Whatever the quantity and the rate of water utilization is, economic principles indicate that there will
always be other water utilization methods which might increase the efficiency of the use of this resource.
Due to the geo-climatic position of Iran, this country finds itself in a water deficit situation as...
Global aquaculture production increased with an average rate of 10% per year since 1990 and 90% of
aquaculture production comes from developing countries thus providing livelihood and income especially
to marginal groups who have limited access to resources such as agricultural land and financial capital.
Geographical information systems (GIS) based...
The experiences on reproductive management of native specie such as Petenia splendida (Tenhuayaca) in the last four years in Tabasco, Mexico has generated enough information to allow the development of a technological package for supporting sustainable rural production, particularly in areas where most of the population belongs to ethnical groups....
Although European fish consumption is increasingly dependant on aquaculture products given the
decrease of worldwide fisheries landings, the image of farmed fish is more and more controversial. This
paper aims at assessing the importance of farmed fish in the European seafood consumption, as well in
terms of image and perception...
Globalisation continues to impact the fisheries sector, aided by international governance frameworks in fisheries production and trade. Within these frameworks, tensions exist between trade facilitating measures and trade restricting measures. For example, UNCLOS extended Exclusive Economic Zones to 200 miles, resulting in a significant increase in volume and trade in...
France is Europe's largest market for salmon, close to saturation for traditional products but open to opportunities for differentiated items. Over the last ten years, the supply of salmon-based products has moved from basic items to more sophisticated ones. Processing is one way of turning the product into what consumers...
This paper discusses sustainable development of Yemeni fisheries towards achievement of Millennium Development Goals (MDG) and stakeholder aspiration. Yemen is considered a Least Developed Country ranking 148 among 174 countries in terms of the Human Development Index. In terms of food security, Yemen is classified as a Low-Income and Food...
Three case studies were included in a study on fishing vessels, most of which use trawl gear in demersal
fisheries. The case studies include the French Bay of Biscay bottom-trawlers, the English beam trawlers
fishing in the English Channel, Celtic Sea and North Sea, and the Basque trawlers fishing in...
The objective of the paper is to briefly present a comparative analysis of trends in the characteristics of
selected European fleets, observed over the last fifteen years, as an introduction to three empirical studies
of the behavioural determinants of these trends. The analysis presented aims at (i) describing changes
observed...
This paper provides a Total Allowable Catch (TAC) assessment model for a single gear, multi-species fishery in South Korea. To estimate appropriate Allowable Biological Catch (ABC) of mackerel and jack mackerel caught by the large purse seine fleet in the territorial waters of South Korea, the model uses an extended...
Unfortunately, most of the stocks are damaged by natural disasters or human activities and rebuilding the
stock are urgent requirements. Until now, in the stock management, some policies are commonly believed
to valid but have not been confirmed. A simulation model of the population dynamics incorporating
uncertainty has been already...
The direct economic values of aquatic resources used in various livelihood activities by
households in selected rural villages of Cambodia were estimated using the net economic value
approach. Data utilized were from 540 aquatic resources dependent households from 3 provinces
gathered using household survey, longitudinal monitoring and participatory rural appraisal...
Tuna, after shrimps, forms the most valuable seafood product in both export and domestic market in Sri Lanka. The
first section of this paper discusses the present status of tuna industry in Sri Lanka and the behavior of export
markets. Secondly, this paper analyzes the impact of technological innovation, effort...
One of the major sectors of Bangladesh agriculture is represented by the fisheries sector. Being a deltaic land
with numerous rivers and inland haors and beels (lakes and lowland areas of considerable size), and also ponds
that are dug in populated areas for the purpose of bathing, washing and often...
Finnish fish markets have traditionally been supplied by domestic wild fish species: Baltic herring, salmon and several freshwater species. Nowadays, farmed salmon and rainbow trout dominate the market and wild-caught species are moving to niche product segment. In this paper we examine the market integration of Finnish fish markets. We...
This paper explores the reasons why the ties between harvesting and processing have been severed in the
Icelandic fisheries in recent decades, and traces the role played by better transport, the emergence of
domestic wet-fish markets, and the introduction of freezing trawlers, as well as other factors in this
development....
This paper re-examines the evidence of causality and price transmission between fish prices of main species landed into Piraeus (Greece) and Cornwall (UK). To complete the analysis of cointegration and causality, we use the data of Floros and Failler (2004) and Avdelas (2004). Our paper uses the Bivariate Generalised Autoregressive...
Recent work in the domain of fisheries ecology has shown that major changes are occurring in fish
communities exploited by commercial fisheries. Selective fishing pressure on more highly valued
components of fish communities, and its indirect effects via trophic interactions, are amongst the key
factors proposed to explain these changes....
Seafood consumption has been traditionally very important in Spain (about 36.5 kg per capita
consumed in 2003). Hake (merluza) is the main fish species consumed in quantity and value
terms in Spain. But commercialised as hake can be found several fish species and presentations.
When many papers focus on product...
Recent increases in imports of catfish and crawfish have caused concern as to their impact on domestic
prices. This study identifies the linkages between imports of these goods and U.S. producer prices.
Increases in imports of catfish are shown to decrease related domestic prices. However, recent trends
show a simultaneous...
In multispecies fisheries managed with individual fishery quotas (IFQs), fishers targeting certain species often have
insufficient quota to cover other jointly caught species. New Zealand employs a unique dual price-quantity system to
address this problem. In lieu of acquiring quota, fishers can opt to pay a fee per unit of...
This paper deals with the economic impact of an aquatic invasive alien species on a coastal shellfish
fishery. A slipper-limpet (Crepidula fornicata ) was accidentally imported some decades ago, has
established and is spreading in the bay of Saint-Brieuc (France). This exotic species is acting as a space
competitor for...
Fisher behavior can be divided into choices made in the short term (i.e. tactics) and choices made in the long-mid term (i.e. strategies). Random utility modeling (RUM) is well suited for the empirical analysis of these issues. In this paper, RUM is applied to a number of EU fisheries in...
This paper discusses the connection between the concepts of fishing effort and separability of the
variables in a general fisheries production function of the Translog form. It compares the results
of the discussion with the Cobb-Douglas and Constant Elasticity of Substitution forms. It
concludes that to assume unconditionally that some...
This paper proposes a two-stage method to estimate a generalized Gordon-Schaefer model,
using heterogeneous fishing data in the logbook. A Cobb-Douglas production function is consistently
estimated in the first stage by means of the ‘within period estimator’. A stock index
is constructed and used to estimate the logistic growth model...
The concept of natural resource rents is much used in the natural resource and fisheries
economics literature. It is therefore somewhat surprising that in this same literature it is difficult
to find a clear definition of either natural resource rents or fisheries rents. Possibly, as a result,
the concept is...
Oregon ocean shrimp annual harvest relies on the successful recruitment and growth of age one shrimp. Changes in oceanic conditions appear to have major impacts on recruitment, spatial abundance and growth rates. Successful recruitment has been identified with the timing and strength of the spring transition generating oceanic conditions favorable...
Though long a standard technique in engineering and medical research, duration or survival analysis has
become common in economics only in recent decades, and in fisheries economics we are aware of only
one previous study. In this paper, we demonstrate the usefulness of duration analysis to understanding
fleet dynamics, specifically...
This paper presents a new bio-economic simulation model for the Italian fisheries developed as a part of a project financed by The General Directorate for Fisheries and Aquaculture (under the Italian Ministry of Forestry and Agriculture Policies). The main objective of the model is to measure the effects of different...
The UN MDG of 2000 include poverty eradication, protection of our common environment, and human
rights, democracy, and good governance. Fisheries have been expected to contribute to meet these goals,
especially after the UNCLOS III. As a result, many developing countries have over-invested in fisheries
with environmental degradation by industrial...
It is now widely recognized that property rights based fisheries management regimes are well
suited for generating efficiency in fisheries. Apart from access licences, which are very low
quality property rights, individual quotas (IQs) and individual transferable quotas (ITQs) are the
most widely applicable and, indeed, the most commonly applied...
Central Europe is an emerging market for seafood products, with rapidly developing opportunities for foreign direct investment and export. Although Poland in particular is widely regarded as a land of opportunity in the seafood business, surprisingly little effort has been made until now to gain a deeper understanding of the...
Investors in aquaculture are biased against the mangrove areas and prefer to site their farms in the upland parts of Southwest, Nigeria. This study was carried out to compare the yield performance in the two fish farm locations. The tools utilized included descriptive statistics, budgetary and cash flow analyses and...
The introduction of new frozen processed products such as Marine Stewardship Council certified New Zealand hoki into the UK market is providing consumers with options away from the standard choices of cod and haddock. Resource managers all have a stake in successful product endeavors since new exotic seafood choices could...
Fishmeal prices have increased sharply since the mid-2005 and the relationship between the prices of animal and vegetable proteins have become weaker, at least temporarily. This can be explained by a relatively constant fishmeal supply, which have varied around 6-7 million metric tons the last two decades, and an increasing...
The objective of this paper is to explore eating and shopping habits related to fish across five European countries. A cross sectional consumer survey was carried out in Belgium, Denmark, Netherlands, Poland, and Spain. A total sample of 4800 consumers was obtained, and the sample was representative within each country...
Marine scientists and policymakers are encouraging ecosystem-based fishery management (EBFM), but there is limited guidance on how to operationalize the concept. We develop a method for EBFM based on financial asset management that uses the joint probability distribution of species in an ecosystem. Illustrating our method with the Chesapeake Bay,...
The world aquaculture industry is expanding its output but at the same time it is generating concerns about environmental sustainability. It is often heavily concentrated in coastal areas where there is strong competition for space and water resources and where it has been associated with externalities such as habitat destruction...
The objective of this study is to investigate the sustainability properties of the stock of the shrimp trawl
fishery in the Tonkin Gulf, Vietnam. Surplus production models of Verhulst-Schaefer and Gompertz-Fox
are applied to the shrimp trawl fishery, which is a typical tropical fishery with the characteristic properties
of small...
Sea lice are natural parasites, and are spread between wild salmon stocks and farmed salmon. Studies indicate that sea lice from salmon farms not only cause economic losses to salmon aquaculture producers, but also affect other marine resources. Currently one of the most controversial debates over sea lice from salmon...
This paper describes the assumptions, scenarios and calculations underlying best estimates of the current costs of three notifiable fish diseases in the United Kingdom: infectious salmon anaemia (ISA), viral haemorrhagic septicaemia (VHS) and infectious haemorrhagic necrosis (IHN). The benefits of avoiding a major disease outbreak are effectively the return on...
Most aquaculture rotation models deal with growing out a species to market size or to the optimum rotation age. Owners of these technologies often are also interested in investing in the growth parameters of the species, in order to shorten rotations. However, some species like the spotted and the Atlantic...
Aquaculture worldwide has grown rapidly, and while this has brought socio-economic benefits to particular regions there is persistent concern over its environmental impact and sustainability. Within Europe there are quite marked regional variations in the intensity of marine aquaculture, and the fact that this occurs in areas where there is...
This paper examines the eleven year Department for International Development funded Fisheries Management Science Programme as a model to explore how fisheries management science can contribute to achieving the Millennium Development Goals. It describes how the Programme strategy was able to adapt to a changing policy environment and local needs...
Market chain analysis can provide information on distribution of costs and profits to intermediaries and aid in identifying concentrations of market power. There is a paucity of research and limited empirical data on market chains in developing country fisheries, especially small-scale fisheries. With these fisheries dominated by artisanal and subsistence...
Economic performance indicators are needed in order to improve fisheries policy in Vietnam. The
research project “Revenues and Costs of Fishing Vessels in the Nha Trang Area” has been established to
meet these needs. A questionnaire about technical characteristics and economic data of vessel and gear
in use in the...
The financial success of the Scottish whitefish fleet is directly affected by the outcome of the December
2005 EU fisheries council where the fisheries management measures are decided.
To assist government, vessel owners and industry bodies at the December council negotiations, the
Seafish economics team has developed a cost and...
Community fishery rights are use rights (the right to take part in fishing) and/or management rights (the right to be involved in managing the fishery) implemented at a local, community level. While by no means a new invention, community rights are receiving renewed attention as a mechanism to improve the...
As part of the Namibian government initiative on sustainable resources development, the Ministry of Fisheries and Marine Resources strongly urges right holders to continuously engage in value addition and market diversification of their products in an effort to realise maximum returns on their products. The importance of being in line...
The economic viability of the fishery will be dependant on the ability of the processors to deliver
desired products to their customers, when required. The ultimate goal must therefore be to identify
what the customers want and then to optimise the process that delivers the final product.
Catching fish is...
The decision to enter or exit a fishery can be expected to depend on the anticipated profitability of operating in
this fishery, as a function of observed vessel performances in previous years. For a vessel exiting a fishery,
there may be several reasons including decommissioning, selling or operating elsewhere. Entry...
Salmon is one of the most successful aquaculture species measured in produced quantity and growth. The industry is highly export oriented, and creation of new markets has been instrumental for the industry's success. However, the rapid transformation of the markets due to the increased production has also led to a...
The paper presents a spreadsheet based benefit-cost framework for assessing the net benefits of domestic
tuna processing to the resource-owning nation. The framework has a number of advantages including
transparency, flexibility, and a check on internal consistency. The case study examines the effects of a
range of tax, access fee...
This paper provides a working definition of bioeconometrics and a taxonomy of model types. A bioeconometric model is an empirical model of a bioeconomic system in which quantitative changes in one or more parameters can affect the qualitative behavior of the dynamical system. Bioeconometric model types include equilibrium, dynamically decoupled,...
Since 1950, the real value of fish catches in Norway has about doubled, while the number of fishermen has declined by about 85 percent. This has made it possible to maintain fishermen's incomes roughly on par with other occupational groups in Norway. It is investigated to what extent this increase...
In the 1990s the North Pacific Fisheries Management Council and the National Marine Fisheries Service established regulations to limit the amount of Chinook and chum salmon taken as bycatch in Bering Sea trawl fisheries. The Bering Sea pollock fishery has in recent years (2002-2005) caught a significant number of sockeye...
Eco-labeling has been touted as a way for consumer preferences for environmentally benign products to be transmitted in markets. The label, as the argument goes, provides information to consumers who may then pay a price premium for the labeled products. Producers view demand for the eco-labeled products as quality differentiated...
This paper proposes a formal analysis of the discarding issue including the sorting labour costs. Empirical evidences from an application to the Nephrops fishery in the Bay of Biscay show that sorting is an important time consuming activity on board and a factor of discarding. However existing literature does not...
The Southeast U.S. shrimp harvesting sector is one component of the shrimp industry that has generally been unable to make the adjustments needed in response to the growing import base and the resulting supression in prices. Not unexpectedly, therefore, requests for relief from the perceived problems associated with increasing imports...
The incidental catch of non-targeted species is a significant issue in fisheries management. Most current approaches to bycatch control have viewed it as a purely technological problem; however, there is growing evidence that fishermen are able to control their bycatch, albeit at a cost, by their choice of where to...
Fisheries biologists and other marine scientists working closely with the regional fisheries organisations (RFOs), such as the International Council for Exploration of the Sea (ICES) have developed and applied different concepts and methods, including reference points, for assessment and management of fish stocks. However, management recommendations are usually not based...
For decades, three producers-organisations, Icelandic Freezing Plants, Iceland Seafood and Union of Fish Producers
(SIF) took care of export and marketing activities of ground fish products from Iceland. These organisations had a
virtual monopoly through export licences in exporting frozen and salted seafood product till late 1980´ and early
1990´....
In many low and middle income countries vulnerability and social exclusion of fisherfolk are major contributors to the 'uncertain environment' in which fisheries are to be rebuilt. Rights-based approaches are seen as essential to rebuilding fisheries by reducing the uncertainty in current fishery access and ownership regimes. This paper argues...
A two-stage, distributionally neutral and efficient rationalization policy design—one that preserves the ex
ante wealth distribution—is developed by blending elements of a cooperative and a partnership. It is
formally proven that there is no impediment to win-win rationalization using only IFQs allocated only to
harvesters. The design creates a bilateral...
Fisheries co-management is essentially the sharing of responsibilities and/or authority between the government and local resource users to manage the fishery resource. This strategy is recognized as a solution to the problems encountered in centralized top-down management approaches. In the 'stake net fishery' of Negombo estuary in Sri Lanka, an...
As early as 1491 in an Act of Parliament during the reign of Henry VII of England, overfishing and
the capture of juveniles were recognized as root causes of declining fish catches, and since then,
minimum capture sizes, closed seasons and areas, and gear restrictions have been implemented to
address...
The fishery sector plays multiple roles in the national economies of West and Central African
countries, including contributions to economic growth, employment, exports and tax revenues. A high
proportion of these benefits are generated by the small-scale sector and contribute in various ways to
food security and poverty reduction -...
The North Sea plaice and sole fisheries are assessed using a novel methodology based upon delay difference equations. This approach casts management options in terms of a grid of harvest rate and of mean size of harvest relative to mean size in the sea. These are convenient axis for considering...
Resource rents are an important indicator of the economic viability of the living marine resources. Rent dissipation is normally an indicator of a poorly managed, overfished stock of fish. Rent dissipation in the US Gulf of Mexico Shrimp Fishery is more an indicator of the lack of management since recruitment...
A study was conducted to understand current practices of commercially important marine fish marketing systems in the Patuakhali area of southern Bangladesh. A total of ten commercially important marine fish were identified such as: 1) hilsa, 2) pomfret, 3) marine catfish, 4) tuna, 5) coral fish, 6) marine eel, 7)...
In Africa, there is a growing awareness of the need to learn from the fisheries experiences of Asia, where the fisheries conditions are similar, to solve the deepening crisis in fisheries and poverty in the continent. As a response, technical assistance in the areas of fish stock assessment, fisheries management...
Like most other coastal water bodies around the world, this Thailand’s largest bay on the Andaman
seaboard has suffered the similar plights that have led to serious deterioration of coastal resources over
the years. Despite its natural wealth derived from the fertile watershed and tropical climatic settings,
Thailand’s modern economic...
Nearly 75% of the stocks in the waters of the European Union are overused. Therefore, recovery programs
are both necessary and urgent. However, the decisions made by the fisheries ministers rather seem
to prolong the overuse situation instead of putting an end to it.
From an overall perspective, it would...
Fishery co-management, where local fishermen form a group to manage the fishery in a collective manner,
have recently garnered a considerable amount of interest among fishermen and regulators, both in
developed and developing countries. Conceptually it is seen as an alternative to centralized command-and-control
regulations, as well as individually privatized...
The fishing communities in the St. Anthony area of Newfoundland, Canada, were forced to adjust to the
collapse of cod catches in Atlantic Canada in the early 1990’s. It was not only the fishing industry that
was affected. The entire community had to live through the changes in resources. To...
This paper describes a community-based management methodology that was used to promote the
sustainable management of marine resources, especially sea cucumbers, within a village in the Trobriand
Islands, Milne Bay Province, Papua New Guinea. While recognising traditional and customary
knowledge and systems, the methodology encouraged increased participation of resource users...
The open access nature of fisheries resources had caused application of excessive fishing effort to most World fisheries. Proper
management of fisheries resources is vital for sustainability and its safe future utilisation. Most attempts to salvage fisheries resources
had so far succeeded but have also created one or more problems....
The West Coast Rock Lobster fishery is Australia's most valuable commercial fishery. Around 550 vessels
harvest 10,500 tonnes of lobster per annum. The industry has an enviable track record of biological
management which has been based on a variety of input controls. In recent years this has necessitated three
significant...
Fisheries exploited under open-access conditions create externalities, resulting in a range of problems associated with over-capitalisation and stock depletion. One answer to this is to shift the mode of production away from hunting and towards husbandry, an approach which becomes feasible where some control can be exercised over the resource...
Vietnam’s marine fisheries are in need of knowledge-based management. This necessitates the establishment of
reliable indicators, which in turn entails a good data collecting and processing system. To bridge the gap between
specific requirements for fisheries policy development and the limited resources available, we have conducted a
study on costs...
If fisheries management is supposed to affect behaviour, it has to be enforced. Fisheries
enforcement has generally been found to be quite costly compared to the attainable rents from
the fishery. This has a number of important implications. First, obviously, it is economically
important to operate the enforcement activity at...
This paper discusses the development of a Marine Sector Strategy for Qeshm Island for the Qeshm Free
Area Authority (QFA). Qeshm Island is an Iranian island, a Free Trade Zone near the entrance of the
Persian Gulf in the Straits of Hormuz. The long-term strategy of QFA is to develop...
This paper identifies factors of non-compliance for the Heard Island and McDonald Island (HIMI)
Fishery of Australia and analyses these factors under the theoretical framework of non-compliance that
exists in fisheries economics literature. It is found that identified factors were consistent with the
theoretical construct. The paper also examines various...
The field of marine resources management is very broad and diverse. It is also very dynamic as new and
exciting research is being produced in emerging fields such as aquaculture and integrated management.
This research proposes to evaluate the trends in research pertaining to the many fields within marine
resources...
Early in 2002, members of two Producer Organisations (POs), the North Sea Fishermen’s
Organisation in Britain, and the Dutch Cooperative Producentenorganisatie Oost Nederland,
realised that their quotas of plaice and sole were insufficient to last until the end of the quota
period. Vessels have in the order of 70-80% of...
The present article describes the changes that took place, in terms of efficiency and distributional issues, within
Chile’s central-southern pelagic fishery industry when the administrative regime evolved from controlling the
fishing effort to assigning individual fishing quotas. These changes are described through a set of indicators that
reveal variations in...
This paper is drawn from a project report that was sponsored by the United Nations through the Benguela Current Large Marine Ecosystem Programme. We analyze the economics of fishery management in the Benguela Current Large Marine Ecosystem (BCLME), reviewing the case for and against regional co-operation in managing the BCLME....
This paper studies the consequences of creating a marine protected area (MPA) on a recreational non-extractive use of the ecosystem (scuba diving), and draws a parallel with the impact of MPAs on
commercial fishing. The first part of the paper presents some preliminary results of a field survey of scuba...