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1.
Shrimp exports are one of Sri Lanka's major foreign exchange earners and account for 40%–50% of total aquaculture exports.
There has been a recent and rapid expansion of the industry in the Northwestern Province (NWP) of Sri Lanka but the industry
has suffered from disease outbreaks and environmental problems. Currently, shrimp farms cover nearly 3000 ha of the coastal
area of the NWP.
The environmental impacts of shrimp cultivation in general are well known and numerous research studies have been done. However,
little work has been carried out in Sri Lanka. This study provides some necessary background to brackish water shrimp aquaculture
in Sri Lanka. It focuses briefly on the development of shrimp aquaculture and the current status of the industry. Emphasis
is placed on two broader aspects—impacts on the existing wetland ecosystem and on the environment. These impacts are presumed
to be the main causes hindering the growth of the industry and raising widespread public protest. Current ecosystem and environmental
management practices are discussed. Finally, strategic issues for management and sustainable growth are discussed. 相似文献
2.
Mangrove ecosystems in Sri Lanka are increasingly under threat from development projects, especially aquaculture. An economic
assessment is presented for a relatively large (42 ha) shrimp culture development proposed for the Rekawa Lagoon system in
the south of Sri Lanka, which involved an extended cost–benefit analysis of the proposal and an estimate of the “total economic
value” (TEV) of a mangrove ecosystem. The analysis revealed that the internal benefits of developing the shrimp farm are higher
than the internal costs in the ratio of 1.5:1. However, when the wider environmental impacts are more comprehensively evaluated,
the external benefits are much lower than the external costs in a ratio that ranges between 1:6 and 1:11. In areas like Rekawa,
where agriculture and fisheries are widely practiced at subsistence levels, shrimp aquaculture developments have disproportionately
large impacts on traditional livelihoods and social welfare. Thus, although the analysis retains considerable uncertainties,
more explicit costing of the environmental services provided by mangrove ecosystems demonstrates that low intensity, but sustainable,
harvesting has far greater long-term value to local stakeholders and the wider community than large shrimp aquaculture developments. 相似文献
3.
Hein L 《Environmental management》2002,29(3):349-359
In the last decade, Indian shrimp aquaculture production tripled from 30,000 tons (1990) to 102,000 tons (1999). This fast
development, combined with a lack of adequate planning and regulation, caused a number of environmental problems and social
conflicts, including conversion of mangroves, water pollution, and salinization of drinking water wells. Because of the significant
investments made in shrimp culture and the size of the environmental and social impacts, the formulation of a regulatory framework
for shrimp aquaculture has been subject to an intensive debate between the aquaculture and the environmental lobbies. Following
an order from the Supreme Court (1996), the Aquaculture Authority was established and a regulatory and institutional framework
for the shrimp aquaculture sector has been set up. However, implementation of the system is still defective, and there is
an urgent need for improvement. Farmers are increasingly able to prevent the devastating white spot disease in shrimps, and
in the absence of proper planning and regulation, further expansion of shrimp production could result in significant additional
environmental and social costs. The environmental and social management of Indian shrimp farming can be improved through a
mix of policy measures, including strengthening of the license system, more effective enforcement of regulations, the use
of economic incentives, and increased monitoring of environmental and social impacts. 相似文献
4.
Marta G. Rivera-Ferre 《Journal of Agricultural and Environmental Ethics》2009,22(4):301-321
Industrial shrimp farming has been promoted by international development and financial institutions in coastal indebted poor
countries as a way to obtain foreign exchange earnings, reimburse external debt, and promote development. The promotion of
the shrimp industry is a clear example of a more general trend of support of export-oriented primary products, consisting
in monocultures of commodities, as opposed to the promotion of more diverse, traditional production directed to feed the local
population. In general, it is assumed that export-oriented aquaculture and agriculture, in a framework of liberalization policies,
facilitates economic growth and this is associated with poverty reduction and the improvement of food security. However, it
has been shown that the promotion of export-oriented production, mostly in the hands of big corporations, can have detrimental
consequences for the livelihoods of local populations and the environment. As a result, international institutions, NGOs,
and the industry aim to minimize these impacts by promoting sustainable export-oriented production. But some impacts may remain,
since the main issue is the primary focus on international deregulated markets and the search for cheap primary products.
To illustrate the relationships between the mainstream concept of development, the environmental and social impact of industrial
farming systems, and the promotion of export-oriented production in developing countries, this article analyzes the case of
the shrimp aquaculture industry. 相似文献
5.
Issues,impacts, and implications of shrimp aquaculture in Thailand 总被引:11,自引:0,他引:11
Water quality impacts to and from intensive shrimp aquaculture in Thailand are substantial. Besides the surface and subsurface salinization of freshwaters, loadings of solids, oxygen-consuming organic matter, and nutrients to receiving waters are considerable when the cumulative impacts from water exchange during the growout cycle, pond drainage during harvesting, and illegal pond sediment disposal are taken into account. Although just beginning to be considered in Thailand, partial recirculating and integrated intensive farming systems are producing promising, if somewhat limited, results. By providing on-site treatment of the effluent from the shrimp growout ponds, there is less reliance on using outside water supplies, believed to be the source of the contamination.The explosion in the number of intensively operated shrimp farms has not only impacted the coastal zone of Thailand, but has also resulted in an unsustainable aquaculture industry. Abandonment of shrimp ponds due to either drastic, disease-caused collapses or more grandual, year-to-year reductions in the productivity of the pond is common. To move Thailand towards a more sustainable aquaculture industry and coastal zone environment, integrated aquaculture management is needed. Components of integrated aquaculture management are technical and institutional. The technical components involve deployment of wastewater treatment and minimal water-use systems aimed at making aquaculture operations more hydraulically closed. Before this is possible, technical and economic feasibility studies on enhanced nitrification systems and organic solids removal by oxidation between production cycles and/or the utilization of plastic pond liners need to be conducted. The integration of semi-intensive aquaculture within mangrove areas also should be investigated since mangrove losses attributable to shrimp aquaculture are estimated to be between 16 and 32% of the total mangrove area destroyed betweeen 1979 and 1993.Government policy needs to devote as much attention to sustainability issues as it has on promoting intensive pond culture. Such a balanced policy would include training and education monitoring and enforcement, rehabilitating abandoned ponds, managing land use within the coastal zone, more community involvement, and government reorganization to eliminate overlapping jurisdictions among agencies.As integrated aquaculture management becomes more the practice than the exception, less risk of crop failure to the industry and reduced discharge loadings from intensively managed shrimp ponds to receiving waters can be expected. Projected limitations on growing and marketing shrimp in the future, such as scarcity of land and broodstock, continued disease outbreaks, negative publicity, regulatory enforcement, water treatment and solids disposal costs, and increased competition from growers in other Asian countries will also drive the government and the industry towards adopting integrated aquaculture management.The data for this paper was obtained while the senior author was a Visiting Fulbright Researcher at the Coastal Resources Institute (CORIN), Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand. 相似文献
6.
Intensive black tiger shrimp (Penaeus monodon) aquaculture ponds have replaced significant areas of coastal wetlands throughout tropical Asia. Few studies have assessed
potential impacts on avian foraging habitats. At Khao Sam Roi Yod National Park, Thailand, seminatural wetlands have been
converted to either shrimp ponds or to salinization ponds that provide saline water for shrimp aquaculture. Although shorebirds
cannot feed in aquaculture ponds, hypersaline ponds can provide productive foraging areas. Thus, the overall impact of the
shrimp industry on shorebirds depends partly on the relative quality of the salt ponds compared to seminatural wetlands. In
this study, we examined wintering shorebird use of tidal (N = 5 sites) and supratidal areas (four wetland sites, four salt pond sites) and compared the shorebird community (14 species),
prey availability, profitability, and disturbance rates between wetlands and salt ponds. Two shorebird species fed in higher
densities in wetlands, whereas seven species were more abundant in salt ponds. Large juvenile fish and dragonfly larvae were
more abundant in wetlands, whereas there were more small Chironomid midge and fly larvae in salt ponds. We conclude that salt ponds might provide higher-quality foraging habitats compared to
wetlands for small shorebirds species because of the abundance of small larvae. However, the shrimp aquaculture industry reduces
habitat availability for shorebirds feeding on larger prey. This study demonstrates a comprehensive, multispecies approach
to assess the impacts of a large-scale change in coastal habitats for wintering shorebirds. 相似文献
7.
Bergquist DA 《Environmental management》2007,40(5):787-802
This article discusses environmental sustainability in aquaculture and its contribution to poverty alleviation, based on field
studies in Sri Lanka and the Philippines. The aquaculture practices studied are the monoculture of the black tiger prawn (Penneaus monodon) and milkfish (Chanos chanos) and the polyculture of the two species together with the mud crab (Scylla serrata). Factors affecting economic viability, social equity and environmental impacts in aquaculture are discussed and used to
illuminate local and regional differences between aquaculture in Sri Lanka and the Philippines. Findings indicate that the
most significant difference is the level of participation by local people (i.e., people originating ≤10 km away from the farm
location). In the Philippines, 84 % of the people involved in aquaculture are locals, whereas in Sri Lanka, 55% are outsiders.
Whether differences between the two areas can be explained by analyzing regional conditions, which might have resulted in
different aquaculture practices, is discussed. In Sri Lanka, semi-intensive shrimp monoculture is currently the most common
practice, whereas in the Philippines, extensive shrimp/fish polyculture is more common. Previous studies, as well as fieldwork,
indicate that extensive culture practices reduce environmental impacts and benefit local people more. Sustainability in aquaculture
is, however, also dependent on the extent of mangrove conversion into ponds. As such, extensive and locally owned farms do
not necessarily result in an all but sustainable situation. Keeping this in mind, it is discussed if extensive polyculture
practices might result in a more sustainable aquaculture, both environmentally and socioeconomically. 相似文献
8.
Aquaculture tenures or leases have become an increasingly important management tool for regulating access rights to coastal and offshore marine habitat. Tenure, as a form of private property rights to marine space, is generally considered a prerequisite for aquaculture development, as are the associated exclusive access rights which provide necessary incentives for producers to invest in infrastructure. The shellfish industry in British Columbia (BC), Canada, is presented as a case study of a transition from a primarily common property wild fishery to a rights‐based system for aquaculture. In BC, seafood production has grown substantially during the past two decades as a result of aquaculture production. However, despite the inherent economic advantages of the tenuring system for increasing seafood production, rights to aquaculture sites in BC remain highly controversial, particularly in response to environmental concerns and infringements on Aboriginal territorial claims. Shellfish farming has, to‐date, been far less controversial than salmon farming; however, shellfish aquaculture has not been uniformly adopted across the province, and analyses of industry capacity or economic opportunities for coastal communities have failed to adequately explain development patterns. This paper, which identifies perceptions of the risks and benefits of the shellfish aquaculture tenuring system, presents the results of 56 interviews conducted with individuals involved in shellfish production in BC. Results indicate that heightened perceptions of risk about shellfish aquaculture tenuring are related to unresolved Aboriginal territorial claims, economic dependence on wild shellfish resources, as well as place‐based values favouring access to wild resources. Underlying values and cultural understandings also strongly shape public perceptions of the risks of aquaculture, and as such, influence local decisions to either accept or resist industry growth. In this case, interviewees' risk perceptions were found to be more important indicators of the potential for industry expansion than studies of capacity or economic cost‐benefit analyses. 相似文献
9.
Ecosystem-based approaches to aquaculture integrate environmental concerns into planning. Social–ecological systems research can improve this approach by explicitly relating ecological and social dynamics of change at multiple scales. Doing so requires not only addressing direct effects of aquaculture but also considering indirect factors such as changes in livelihood strategies, governance dynamics, and power relations. We selected the community of Puerto Morazán, Nicaragua as a case study to demonstrate how the introduction of small-scale aquaculture radically transformed another key livelihood activity, lagoon shrimp fishing, and the effects that these changes have had on lagoons and the people that depend on them. We find that shrimp aquaculture played a key role in the collapse, in the 1990s, of an existing lagoon common-property management. Shrimp aquaculture-related capital enabled the adoption of a new fishing technique that not only degraded lagoons but also led to their gradual privatization. The existence of social ties between small-scale shrimp farmers and other community members mitigated the impacts of privatization, illustrating the importance of social capital. Since 2008, community members are seeking to communally manage the lagoons once again, in response to degraded environmental conditions and a consolidation of the shrimp industry at the expense of smaller actors. This research shows that shrimp aquaculture intersects with a complex set of drivers, affecting not only how ecosystems are managed but also how they are perceived and valued. Understanding these social–ecological dynamics is essential to implement realistic policies and management of mangrove ecosystems and address the needs of resource-dependent people. 相似文献
10.
Coastal Aquaculture Development in Bangladesh: Unsustainable and Sustainable Experiences 总被引:1,自引:0,他引:1
Coastal aquaculture in Bangladesh consists mainly of two shrimp species (Penaeus monodon and Macrobrachium rosenbergii). Currently, there are about 16,237 marine shrimp (P. monodon) farms covering 148,093 ha and 36,109 fresh water shrimp (M. rosenbergii) farms covering 17,638 ha coastal area. More than 0.7 million people are employed in the farmed shrimp sector and in 2005–2006
the export value of shrimp was 403.5 million USD. Thus, coastal aquaculture contributes significantly to rural employment
and economy but this is overshadowed by negative social and ecological impacts. This article reviews the key issues, constraints
and opportunities of sustainable shrimp farming. In addition we present the results of two case studies from southwestern
coastal areas where shrimp farming originated and central coastal areas where shrimp farming, especially M. rosenbergii, began in recent years. Lessons learned from the review and case studies are considered in the context of recommendations
to encompass a socially equitable and ecologically sound coastal aquaculture. 相似文献
11.
The Environmental Impact of Shrimp Aquaculture: Causes, Effects, and Mitigating Alternatives 总被引:3,自引:0,他引:3
FEDERICO PÁEZ-OSUNA 《Environmental management》2001,28(1):131-140
Attracted by the demand for shrimp in the developed countries, shrimp aquaculture has expanded rapidly, mainly in the subtropical
and tropical lowlands of America and Asia. This work provides a global review and viewpoint on the environmental impacts of
shrimp aquaculture, considering the causes and effects of the siting and operation of shrimp ponds and abandonment of farm
facilities. Additionally, mitigating alternatives are discussed. To date, approximately 1–1.5 million ha of coastal lowlands
have been converted into shrimp ponds, comprising mainly salt flats, mangrove areas, marshes, and agricultural lands. The
impact of shrimp farming of most concern is the destruction of mangroves and salt marshes for pond construction. Compatibility
with other users, the presence of buffer zones, maintaining an acceptable balance between mangroves and shrimp pond area,
improved pond design, reduction of water exchange, and an improved residence time of water, size and capacity to assimilate
effluents of the water body, are examples of ways to mitigate the adverse effects. The use of mangroves and halophytes as
biofilters of shrimp pond effluents offers an attractive tool for reducing the impact in those regions where mangrove wetlands
and appropriate conditions for halophyte plantations exist. Healthy seed supply, good feed with the use of prophylactic agents
(including probiotics), good water quality, and lower stocking densities are examples of actions suggested to control disease
in shrimp farming. Finally, in the context of integrated management, research priorities are suggested. 相似文献
12.
Walter J. Blogoslawski 《Environmental management》1992,16(4):521-529
For the past 11 years the annual Shellfish Biology Seminar at Milford CT has provided a unique forum for aquaculture scientists
and industry officials to exchange information about estuaries facing increased pollution problems, especially Long Island
Sound and the Great South Bay. Because these two areas are so rich in productivity and diversity, fish and shellfish farmers
utilize their waters, shellfish beds, and shore land for hatcheries and grow-out facilities. These individuals seek better
management of the coastal estuarine environment and its resources, providing a working example of environmental stewardship.
In aquaculture, good science is required to understand the complex variables and interaction of estuarine currents, tides,
temperature, and cycles of reproduction. Aquaculturists are beginning to understand the need for specific nutrients and how
the wastes of one species can be utilized for enhanced production of another species.
Over the years, this meeting has formed an amalgam of both the aquaculture industry and research scientists where both groups
foster mutual environmental concern. Science is able to focus on the theoretical aspects of pollutant damage. while the aquaculture
industry is able to define the problem and need for assistance to eliminate pollutants from their crops—shellfish and finfish.
Overfishing is not an issue at these meetings, as the group accepts the damage already done to wild resources and seeks new
technologies to grow food sources under controlled and stable market conditions.
Therefore, it could be said that the seminar serves as a meeting ground where the theoretical knowledge of scientific study
finds practical application in the industry and is fueled by the needs of that industry. This ideal blend of the two groups
produces better management of the resource and a safer environment—the goal of stewardship. 相似文献
13.
Jenny Bergqvist Stefan Gunnarsson 《Journal of Agricultural and Environmental Ethics》2013,26(1):75-99
The aim of this review is to assess the ethical implications of finfish aquaculture, regarding fish welfare and environmental aspects. The finfish aquaculture industry has grown substantially the last decades, both as a result of the over-fishing of wild fish populations, and because of the increasing consumer demand for fish meat. As the industry is growing, a significant amount of research on the subject is being conducted, monitoring the effects of aquaculture on the environment and on animal welfare. The areas of concern when it comes to animal welfare have here been divided into four different stages: breeding period; growth period; capturing and handling; and slaughter. Besides these stages, this report includes a chapter on the current evidence of fish sentience, since this issue is still being debated among biologists. However, most biologists are at present acknowledging the probability of fish being sentient creatures. Current aquaculture practices are affecting fish welfare during all four of the cited stages, both on physical and mental levels, as well as on the ability of fish to carry out natural behaviors. The effect fish farming has on the environment is here separated into five different categories: the decline of wild fish populations; waste and chemical discharge; loss of habitat; spreading of diseases; and invasion of exotic organisms. There is evidence of severe negative effects on the environment when looking at these five categories, even when considering the difficulty of studying environmental effects, due to the closely interacting variables. The ethical arguments and scientific evidences here reviewed have not all come to the same conclusions. Nevertheless, the general agreement is that current aquaculture practices are neither meeting the needs of fish nor environment. Thus, the obvious environmental and animal welfare aspects of finfish aquaculture make it hard to ethically defend a fish diet. 相似文献
14.
/ Intensive shrimp culture has been confined to relatively narrow bands of land along the seashores of tropical developing nations due to the need for large volumes of saltwater for water exchange during the culture period. Recent developments in Thailand suggest, however, that this close association could soon be a thing of the past. Large numbers of Thai farmers are adopting low-salinity culture systems that rely upon sea or salt pan water that is trucked inland. This development greatly increases the potential for establishing shrimp cultivation much further from the coast than previously believed possible. The migration of intensive shrimp farming into freshwater environments, however, raises serious concerns over the disposal of pond effluents and the impact of saltwater intrusion on surrounding agricultural activities. In the absence of effective government regulation of the expansion and operation of the shrimp culture industry, supporting local nongovernmental organizations (NGOs) and community initiatives may be the only means of minimizing the negative impacts of shrimp farming on rural communities.KEY WORDS: Aquaculture; Shrimp; Salinity; Thailand 相似文献
15.
Maki Hatanaka 《Local Environment》2013,18(3):233-244
Drawing on a case study of an organic shrimp project in Indonesia, this paper provides a preliminary assessment of the use of third-party certification (TPC) to make shrimp aquaculture more environmentally sustainable in a rural setting in Indonesia. Specifically, I examine three processes of TPC: (1) the development of standards, (2) the communication of standards, and (3) the enforcement of standards. My research indicates that TPC is based on technoscientific norms and values and Western ideas of rationality. Thus, implementing TPC in rural settings in the global South may pose additional difficulties, resulting from cultural and structural differences. Consequently, TPC may not be able to be successfully implemented everywhere in the world, especially in the rural South, in its current form. 相似文献
16.
17.
Improvements in production methods over the last two decades have resulted in aquaculture becoming a significant contributor
to food production in many countries. Increased efficiency and production levels are off-setting unsustainable capture fishing
practices and contributing to food security, particularly in a number of developing countries. The challenge for the rapidly
growing aquaculture industry is to develop and apply technologies that ensure sustainable production methods that will reduce
environmental damage, increase productivity across the sector, and respect the diverse social and cultural dimensions of fish
farming that are observed globally. The aquaculture industry currently faces a number of technology trajectories, which include
the option to commercially produce genetically modified (GM) fish. The use of genetic modification in aquaculture has the
potential to contribute to increased food security and is claimed to be the next logical step for the industry. However, the
potential use of these technologies raises a number of important ethical questions. Using an ethical framework, the Ethical
Matrix, this paper explores a number of the ethical issues potentially raised by the use of GM technologies in aquaculture.
Several key issues have been identified. These include aspects of distributive justice for producers; use of a precautionary
approach in the management of environmental risk and food safety; and impacts on the welfare and intrinsic value of the fish.
There is a need to conduct a comparative analysis of the full economic cycle of the use of GM fish in aquaculture production
for developing countries. There is also a need to initiate an informed dialogue between stakeholders and strenuous efforts
should be made to ensure the participation of producers and their representatives from developing nations. An additional concern
is that any national licensing of the first generation of GM fish, i.e., in the USA, may initiate and frame an assessment
cycle, mediated by the WTO, which could dominate the conditions under which the technology will be applied and regulated globally.
Therefore, an integrated analysis of the technology development trajectories, in terms of international policy, IPR, and operational
implications, as well as an analysis of a broader range of ethical concerns, is needed. 相似文献
18.
Increasing productivity of open-cut mines in New South Wales and Queensland has been an important element in the expansion of the Australian black coal industry, which now supplies domestic electricity and iron and steel industries as well as increasing export orders. Industry is capable of strong growth but some changes in government policies are needed to ensure that infrastracture is provided and growth is economically efficient and compatible with environmental considerations. Increasing output is likely to prevent the reemergence of manpower problems which once plagued the industry, but such problems could surface if growth is not maintained. 相似文献
19.
The shellfish aquaculture industry (SAI) has operated in Baynes Sound, British Columbia (BC) since the early 1900s. Recognizing the economic potential of the area, the industry has requested additional farming opportunities. However, Baynes Sound upland residents and many other stakeholders have expressed concerns that SAI activities are having a negative impact on the environment, quality of life, and other nonaquaculture resource uses in the area. In order to address these issues, the Action Plan was initiated by a BC government interagency project team in November 2001. To assist in assessing the strategic aspects of this conflict, the decision support system GMCR II is employed here to apply a new methodology, the graph model for conflict resolution, to systematically analyze the ongoing conflict over shellfish aquaculture development in Baynes Sound within a social, economic, and environmental framework. Valuable insights are procured to guide decision-makers toward sustainability of the shellfish industry. 相似文献
20.
Ecological limitations and appropriation of ecosystem support by shrimp farming in Colombia 总被引:4,自引:0,他引:4
Shrimp farming in mangrove areas has grown dramatically in Asia and Latin America over the past decade. As a result, demand
for resources required for farming, such as feed, seed, and clean water, has increased substantially. This study focuses on
semiintensive shrimp culture as practiced on the Caribbean coast of Colombia. We estimated the spatial ecosystem support that
is required to produce the food inputs, nursery areas, and clean water to the shrimp farms, as well as to process wastes.
We also made an estimate of the natural and human-made resources necessary to run a typical semiintensive shrimp farm. The
results show that a semiintensive shrimp farm needs a spatial ecosystem support—the ecological footprint—that is 35–190 times
larger than the surface area of the farm. A typical such shrimp farm appropriates about 295 J of ecological work for each
joule of edible shrimp protein produced. The corresponding figure for industrial energy is 40:1. More than 80% of the ecological
primary production required to feed the shrimps is derived from external ecosystems. In 1990 an area of 874–2300 km2 of mangrove was required to supply shrimp postlarvae to the farms in Colombia, corresponding to a total area equivalent to
about 20–50% of the country’s total mangrove area. The results were compared with similar estimates for other food production
systems, particularly aquacultural ones. The comparison indicates that shrimp farming ranks as one of the most resource-intensive
food production systems, characterizing it as an ecologically unsustainable throughput system. Based on the results, we discuss
local, national, and regional appropriation of ecological support by the semiintensive shrimp farms. Suggestions are made
for how shrimp farming could be transformed into a food production system that is less environmentally degrading and less
dependent on external support areas. 相似文献