| 5. Aquaculture |
|3 Possible environ mental impacts|
If the project involves the building of artificial ponds and canal systems, this may create improved conditions for the propagation and spreading of water-borne diseases. Stagnant waters can create favourable conditions for the propagation of bilharzia and malaria. Patogens are often widespread in both shallow freshwater areas and shallow salt/brackish water areas.
One should take great care if the production is based on sewage or manure and latrine excrements. Bacteria and other patogens will spread and can pose a health risk to both farmers and consumers.
The use of chemical pesticides (cf. chapter 3.3) should be considered against the potential risk for humans. Use of antibiotics must be under control so that remnants in the farm produce are avoided. Spreading to wild fish and other naturally existing organisms is likely to occur. Yet these organisms are rarely tested even if they may, for periods of time, contain considerable amounts of antibiotics.