INVESTIGATIONS OF KEY ENVIRONMENTAL FACTORS DETERMINING THE SUSTAINABILITY AND PRODUCTIVITY OF SHRIMP AQUACULTURE IN TROPICAL COASTAL REGIONS
1.1 BACKGROUND TO THE STUDY
For centuries, the coastline has been the most important human habitat, and, as a result, has been subject to a wide range of development pressures (Holland, 1998). Shrimp farming represents additional pressure on these areas, at least potentially. While shrimp farming per se does not necessarily have a significant adverse impact on the coastal environment, inappropriate practices and unplanned development have led to a number of problems. According to Chua (1992), the main environmental impacts associated with shrimp aquaculture, and ways in which specific impacts can be reduced or mitigated are being researched into in this study. The actual or potential environmental impacts of shrimp farming fall into the following categories: • Destruction of natural habitat (through direct conversion);
• Abstraction/contamination and salinization of groundwater;
• Organic matter and nutrient pollution;
• Harvest of brood stock and wild post-larvae (PL);
• Introduction of exotic species;
• Abandonment; and
• Use of fish meal in feeds.
Measures have already been adopted widely by the industry; in others, the suggestions are based more on theory than on practical application. In either case, more research needs to be undertaken to document the effectiveness of the proposed mitigation measures in addressing the impacts. From the outset, however, it should be emphasized that many of the impacts from shrimp aquaculture are not unique to that industry. Rather, they are typical of agricultural practices in general, especially where land is in short supply. It should also be noted that shrimp farms suffer a great deal from pollution caused by other activities, including agriculture and industry. Indeed, while many other activities are relatively careless of their environment, experienced shrimp farmers realize that long-term benefits result from maintaining environmental quality. When establishing new farms, water quality is one of the most important factors to consider; sites where industry, agriculture, or other activities are polluting the water should be avoided (Fegan, 1996).
Extensive shrimp farming takes place in the intertidal zone, commonly in or adjacent to estuarine systems. Semi-intensive and intensive shrimp farming usually takes place in the upper intertidal or just behind/above the intertidal zone, often in adjacent wetlands. Some shrimp farming now takes place in inland areas. Most tropical estuarine systems are dominated by mangrove, an intertidal ecosystem of tree and shrub species specially adapted to saline habitats, that support a wide range of other organisms. Shrimp farms can be constructed away from mangrove areas altogether. The (large-scale) shrimp farming industry organizations, several NGOs, other international organizations, and most governments in the largest producer countries of farmed shrimp now agree that shrimp farms should not be established in mangrove forests. Unfortunately, such avoidance may result in destruction of other natural habitats (such as other wetlands, forests, salt marshes, mud flats, salt flats) with their own natural functions and biodiversity value, or conversion from other uses, such as rice farming, coconut plantation, or other forestry/agriculture. Whether such changes are desirable will depend on local circumstances and priorities. It should be noted, however, that in some countries the only land available to poor, displaced migrant and minority groups is in fact mangrove.
Given the high population density of such areas and the limited sustainable productivity of natural mangrove (Hambrey 1993), such settlements are inevitably resulting in overexploitation or conversion to agriculture and/or aquaculture. In these circumstances, carefully planned and limited conversion to aquaculture may be the best option, perhaps reducing the overall development pressure on mangrove and other valuable natural habitat. Shrimp farms can be constructed on the landward fringe of mangrove. In some circumstances, this may be an attractive option, since such land is often partially saline and of low value for alternative uses. If mangrove is present, it may be highly degraded as a result of human pressure or in natural decline as part of the mangrove cycle of colonization, accretion, and stabilization. Ponds may be constructed so that a belt of mangrove forest is maintained along the coast, with the ponds located immediately behind the mangrove belt (Barg 1999).
1.2 STATEMENT OF THE PROBLEM
Water use in shrimp farming is extremely variable, ranging from little more than make-up water to compensate for evaporation and seepage to very high rates of exchange. For example, for each metric ton of shrimp produced, intensive farms require 50 to 60 million liters of water. The water in shrimp ponds is high in nutrients and organic matter, especially towards the end of the production cycle. These nutrients are derived mainly from waste food and metabolic products, as well as from the small quantities of fertilizer added at the start of the cycle to stimulate plankton blooms. Poor feeding practices, particularly over-use of feed, allows feed to sink to the bottom of the pond. Also, some of the diseases that trouble the shrimp farming industry are directly caused by environmental problems, while a number of other diseases are triggered or spread more effectively by the stress induced by environmental problems. None of the shrimp diseases are known to be pathogenic to humans.
1.3 OBJECTIVES OF THE STUDY
The following are the objectives of this study:
1. To investigate the effect of environmental factors on the sustainability and productivity of shrimp farming in Nigeria.
2. To identify the specific environmental factors that influence shrimp farming in Nigeria.
3. To examine the effect of shrimp farming on the environment in Nigeria.
1.4 RESEARCH QUESTIONS
1. What is the effect of environmental factors on the sustainability and productivity of shrimp farming in Nigeria?
2. What are the specific environmental factors that influence shrimp farming in Nigeria?
3. What is the effect of shrimp farming on the environment in Nigeria?
1.5 SIGNIFICANCE OF THE STUDY
The following are the significance of this study:
1. The outcome of this study will reveal the effects of environmental factor on shrimp farming and how shrimp farming affects the environment in Nigeria.
2. This research will be a contribution to the body of literature in the area of the effect of personality trait on student’s academic performance, thereby constituting the empirical literature for future research in the subject area
1.6 SCOPE/LIMITATIONS OF THE STUDY
This study will cover the relationship between shrimp farming and the environment.
LIMITATION OF STUDY
Financial constraint- Insufficient fund tends to impede the efficiency of the researcher in sourcing for the relevant materials, literature or information and in the process of data collection (internet, questionnaire and interview).
Time constraint- The researcher will simultaneously engage in this study with other academic work. This consequently will cut down on the time devoted for the research work.
Barg, U.C. 1999. Coastal aquaculture and the environment. FAO Aquaculture Newsletter Nov. Chua, T.-E. 1992. Coastal aquaculture development and the environment: the role of coastal area management. Marine Pollution Bulletin 25(1–4):98–103.
Fegan, D.F. 1996. Sustainable shrimp farming in Asia: vision or pipe-dream. Aquaculture Asia 1(2, Oct./Dec.):22–28. Holland, A. 1998. A study of conflict and inequity in shrimp aquaculture in Vietnam, Bangladesh and Mozambique. ARP/DFID, University of Sussex, UK.
Hambrey, J.B. 1993. Coastal Zone Management in North Sumatra: Alternative Economic Uses of the Mangrove of Northeast Sumatra. ODA/Dinas Perikanan.
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