Negative Impacts Of Aquaculture

Potential negative impacts of aquaculture on the ecosystem often include: (i) negative effects from escaped farmed organisms, often more relevant when exotics, (ii) nutrient and organic enrichment of recipient waters resulting in build-up of anoxic sediments and modifying benthic communities, (iii) eutrophication of lakes or coastal zones, (iv) restructuring of biological and/or social environments, (v) release of chemicals used to control water diseases and water quality, and (vi) competition for, and in some cases depletion of resources (e.g. water) (FAO, 2007). It is therefore recommended that regulatory activities in the fisheries sector should focus on recycling of water, wastewater treatment and proper drainage and soak-away pits to minimize

Small-scale fish farming businesses can flourish by the side of rivers and streams in Arochukwu. Community wide fish farming practices, according to Ezumah (ibid), can be encouraged by all the Arochukwu villages sharing the river, through the introduction of fingerlings, which upon maturity can be harvested in an organized ceremony, perhaps to go with the Ikeji (yam festival) in Arochukwu. Ezumah (2015), however, decried that the river in Arochukwu has suffered great neglect, misuse and mismanagement as a result of pollution, inundation of sludge on the river bed, lack of dredging or removal of fallen trees and tree branches, leading to blockage and inhibition of smooth flow of the river at various points. As a result of these, where the river was hitherto wide, deep and fresh, it has narrowed greatly, becoming

They used land-use/land-cover, settlement and elevation of Andoni as criteria for the suitability. The result showed that the places in Andoni that are highly suitable for fish farming are mostly clustered in the highest vegetation cover areas stretching from the Southern parts to about 5 kilometers towards the Atlantic Ocean. The Nypa palm areas have adequate condition such as nearness to water supply and settlements that will provide business opportunities to the ponds. Other areas that were highly suitable were located close to the rivers. Because of the steady and consistent supply of water directly from its source, areas located closer to the water source (river) are highly suitable for fish farming. The highly suitable areas in the southern region support fresh water aquaculture ponds due to the distance away from the salt-water sources (rivers), while those in the southeastern and northern region of the study area (Andoni LGA) encourage salt-water aquaculture ponds due to its nearness to salt-water