ROBOT FISH

Hey everyone whats up?I was looking at websites about animals and found a link that led me to discovery.com were there was a story about robot fish.Some scientists that put the 'bot in the water with fish (without turning it on ) and it was ignored. When they turned it on(it started swimming) all the real fish fell behind it because it is easier to swim when there is a draft (i think that's what is is called )
that the lead fish (in this case the 'bot) creates.This could be used to lead fish away from oil spills and other disasters.