“…Because electric signals enable electrolocation as well as communication, electric fish need to generate their EODs continuously to monitor changes in their surroundings. This dual function of electric signals increases selective pressure for low cost (Bucher et al, 1982), 2 (Eberhardt, 1994), 3 (Grafe et al, 1992), 4 (Hoback and Wagner, 1997), 5 (Horn et al, 1995), 6 (Kavanagh, 1987, 7 (Lee andLoher, 1993), 8 (Prestwich andWalker, 1981), 9 (Prestwich et al, 1989), 10 (Reinhold et al, 1998), 11 (Stevens and Josephson, 1977), 12 (Taigen and Wells, 1985).…”