Several bird species have been identified as “problem species” on culture based fisheries in aqua field. Many species of birds prey on cultivable fishes causing significant losses, predators can kill or wound fish (primary infection), then secondary infection like bacterial, viral and fungal infection starts then cause stress to the fish that results in reductions in appetite that in turn causes poor growth and reduced resistance to disease. This in turn causes poor production and profitability. Records shown that Peligans are the highest predatory fishes, 15kg/month is consumed by this bird. Cormorants, Terns are the lowest predatory fishes, 1.5kg/month consumed by this fishes. Not only that damage equipment and nets, resulting in escape of fishes through damage. Due to predation on fishes by the predatory birds so much economic loss, so it is significantly need the prevention and control of predatory birds in aqua field.
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