Fisheries: The science of producing fish and other aquatic resources for the purpose of providing human food, although other aims are possible (such as sport or recreational fishing), or obtaining ornamental fish or fish products such as fish oil.
Fishery: It is an entity engaged in raising or harvesting fish. It involves the species or type of fish, area of water or seabed, method of fishing, class of boats, purpose of the activities or a combination of the foregoing features and peolpe involved.
Area of the pond, A = 2(lb + ld + bd)
A = 2(20×10 + 20×1.5 + 10×1.5)
A = 2(200 + 30 + 15)
A = 2(245)
A = 490 m