How much can Barra see in dirty water?
Vision is probably limited in dirty water. Barramundi utilise what is called a lateral line, which is a sensory organ that runs down both sides of the body. The lateral line enables fish to detect vibrations in the water and so be able to locate prey and avoid predators.
The question of whether it is the colour or action of a lure that attracts the fish is difficult to answer, however it is probably a combination of both.