Hair cells located in the skin of certain species of bony and cartilaginous fishes have lost their cilia and become modified for the detection of electric currents in the water. The sources of these currents are either the fishes themselves or currents that originate in the active tissues of other animals in the vicinity. The weakly electric fish possess specialized electric organs that generate the fields sensed by these receptors, they can use the fields for communicating with one another and for navigating in turbid water. The skin of mudskippers is highly vascularized and cutaneous and respiration is very important for these fishes.
Some mudskippers have their gill mophology totally modified to adapt for aerial survival.
They can tolerate very high level of ammonia, so ammonia can be momentarily stored within their tissues during a terrestrial excursion. They can also reduce the production of ammonia by partial amino acid catabolism. The pectoral fins of these fishes are adapted to move on land, leaving very unique marks on the mudflats.