Question

why is it difficult to shoot a swimming fish​

Answer 1

Answer:

because fishes swim extremely fast that makes difficult to aim it buddy

Answer 2

Answer:

It is difficult to shoot a fish swimming in water because due to the refraction at water and air interface, the fish appears to be raised, and seems to be close to the surface this is called 'apparent depth'. The shooter aims the gun at apparent position of the fish, instead of real position.