 Teleosts possess highly developed sensory organs . Nearly all daylight fish have colour vision at least as good as a normal human 's . Many fish also have chemoreceptors responsible for acute senses of taste and smell . Most fish have sensitive receptors that form the lateral line system , which detects gentle currents and vibrations , and senses the motion of nearby fish and prey . Fish sense sounds in a variety of ways , using the lateral line , the swim bladder , and in some species the Weberian apparatus . Fish orient themselves using landmarks , and may use mental maps based on multiple landmarks or symbols . Experiments with mazes show that fish possess the spatial memory needed to make such a mental map . 
