How do the fins of African lungfish help them sense their surroundings?

African lungfish possess long, stringy, and highly mobile pectoral and pelvic fins that are kept in a constant state of agitation to actively touch and sense their surroundings. Because these fish have poor eyesight, the tips of their fins have evolved a highly developed sense of touch to help them navigate and perceive their environment. This tactile ability complements their other sensory systems, including a keen sense of smell and taste, as well as the ability to detect pressure and turbulence through their lateral lines.1