ZIMSEC O Level Geography Notes: Natural Resources: Fishing:Problems with inland fishing
- The potential of the SADC region’s fisheries is far from being realized because of several problems bedeviling the fishing industry.
- These include the following:
Sedimentation of rivers, lakes and dams.
- Most of the region’s water bodies are being heavily silted by soil and silt deposits from surrounding farm land.
- Sedimentation reduces water levels and also affects fish spawning.
- This threatens the future viability of the fishing industry.
The water weed/water hyacinth has colonized most inland fisheries
- This can be seen in Lake Chivero of Zimbabwe.
- The weed flourishes due to the sewage rich pollution flowing into water courses.
- The weed reduces oxygen levels in water, blocks sunlight and alters water temperatures.
- The change in environment reduces fish quantities in inland fisheries.
Introduction of foreign fish varieties
- This can be done in some fisheries in order to boost production.
- This can at times have negative effects as some fish are predators to most fish varieties.
Poor management of the fisheries
- Poor management of fisheries has resulted in over-fishing, which in turn has threatened the sustainability of most inland fisheries.
- This is mainly a result of lack of trained human resources in the management and conservation of fish resources.
- Lack of capital to purchase appropriate fishing equipment such as fibre glass motor boats, nets and refrigeration.
- Poor infrastructure such as roads, refrigerated vans, marketing facilities, canning facilities. Most fisheries are inaccessible.
- Inappropriate fishing technology for example fish poisoning, fish traps and canoes.
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