“…The NaCl solution has been used to trigger sperm motility of fish from different orders, such as characiforms B. insignis (present study; Viveiros et al, ), P. lineatus (Viveiros, Orfão, Maria, & Allaman, ) and Colossoma macropomum (Oliveira et al, ), cypriniforms Barbus barbus (Alavi, Rodina, Policar, & Linhart, ), Puntius conchonius (Hu, Zhang, Zhou, & Zhang, ), Vimba vimba (Alavi, Kozak, Hatef, Hamackova, & Linhart, ), Clinostomus elongatus (Butts, Alavi, Mokdad, & Pitcher, ) and Cyprinus carpio (Khara et al, ), and acipenseriforms Acipenser ruthenus (Alavi, Gela, Rodina, & Linhart, ), just to name a few. The NaHCO 3 solution has been used to trigger sperm motility of characiforms species, such as B. insignis (Viveiros et al, ), Leporinus obtusidens (Taitson, Chami, & Godinho, ) and Salminus brasiliensis (Weingartner, Zanandrea, & Zaniboni, ). The use of activating solutions containing K + ion, such as KCl solution, to trigger fish sperm motility has been reported in cypriniforms B. barbus (Alavi, Rodina, Policar, et al, ), C. elongatus (Butts et al, ) and C. carpio (Khara et al, ) in characiforms, this is the first report.…”