Αρχική Ανάπτυξη ΥδατοκαλλιεργειώνΑΡΘΡΟ ΠΡΩΤΟΣχόλιο του χρήστη A G. Lygnos | 6 Μαΐου 2011, 15:13
  • Σχόλιο του χρήστη 'A G. Lygnos' | 6 Μαΐου 2011, 15:13

    Fish farming is the deliberate breeding of fish in enclosures for human consumption or recreational fishing. Salmon, carp, catfish, cod and bass are the most commonly farmed fish, usually cultivated in netted enclosures within natural marine environments. Fish farming is a form of aquaculture, the cultivation of wild marine creatures, that has evolved to meet demand for fish while natural stocks are depleted through overfishing. While fish farming can prove useful in meeting this demand, there are several important issues concerning animal welfare and the environment. Concentration To be profitable, fish farms need to stock as many animals as possible in as little space as possible. This means that farmed fish are enclosed in densities much greater than those they would naturally school in. This can cause stress in the fish and damage their fins and scales when they are forced against the sides of their enclosure. Food Farmed fish, because they cannot hunt for themselves, require feed to be supplied to them. For carnivorous fish, such as cod, salmon and catfish, this comes in the form of pellets processed from wild fish. The website Circle of Responsibility estimated that for each pound of farmed salmon produced, three pounds of wild fish were used as feed. Drugs And Chemicals Concentrating fish in high densities and in close confines inevitably leads to the outbreak of diseases, bacteria and parasites. Farmers sometimes use antibiotics to combat these problems. These drugs can get into the natural marine environment and the human food chain. Farmers also coat their nets with pesticides to prevent damage from algae and shellfish. These chemicals leach into the water and can enter the marine food chain. Environmental Degradation Fish farms produce a concentrated amount of feces. This, combined with chemicals that may be used in the farms, often results in excessive algae growth, which depletes the oxygen in the water, reducing or even eliminating indigenous marine life. The farm enclosures are simply moved to another location when local algal growth becomes too abundant. Read more: Environmental Impacts of Fish Farming | eHow.com http://www.ehow.com/list_6752684_environmental-impacts-fish-farming.html#ixzz1LZzIbWP8