HORTICULTURE

Detailed explanation-1: -The most common negative environmental impacts that have been associated with aquaculture include: waters eutrophication, water quality, alteration or destruction of natural habitats; introduction and transmission of aquatic animal diseases (FAO, 2006a).

Detailed explanation-2: -Fish produce waste, and their waste has the potential to build up in the surrounding area. This can deplete the water of oxygen, creating algal blooms and dead zones. Farmers’ usage of antibiotics to prevent disease created concern about the effect of the drugs on the ecosystem around the cages, including wild fish.

Detailed explanation-3: -Extensive aquaculture includes systems of culture and rearing in which human intervention is concentrated on reproduction of the stock in addition to capture. Compared to fishing, these systems make it possible to selectively increase the production of the species most in demand for man.

Detailed explanation-4: -Examples of fish reared in the extensive fish farming system are catfish, carp, and tilapia. The extensive fish farming system utilizes natural photosynthetic production of food (algae, plankton, mollusks, and crustaceans) to feed the fish.