Endemic to the waters of China, bighead carp has been introduced in 72 countries, mostly after 1960 and primarily for aquaculture purposes (Kolar et al., 2005). The fish, along with other kinds of carp, made its way to the Philippines from Taiwan in 1966 through the Fisheries Bureau, and to Laguna Lake in the mid-1970s through two fish pen producers (Baluyut, 1989).