José Ángel Nájera Sánchez was a Mexican luchador, or professional wrestler, best known under the ring name Fishman. Fishman was one of the top wrestlers in the mid-1970s and 1980s and worked for Empresa Mexicana de Lucha Libre, the Universal Wrestling Association, the World Wrestling Association and AAA in Mexico as well as frequent trips to Japan and the United States. Nájera was unmasked after losing a match in 2000 and retired shortly afterwards. Three of his sons are all luchadores enmascarados known by their ring names Black Fish, El Hijo del Fishman and El Único de Ciudad Juárez.

The NWA World Welterweight Championship is an inactive professional wrestling championship governed by the National Wrestling Alliance (NWA) and most recently promoted by NWA Mexico. The championship was originally created in 1946 by the Mexican promotion Consejo Mundial de Lucha Libre (CMLL). As with all professional wrestling championships, matches for the NWA World Welterweight Championship were not won or lost competitively but by a pre-planned ending to a match, with the outcome determined by the CMLL bookers and match makers. CMLL controlled the championship from 1946 until 1996 and again from 2007 until 2010. From 1996 until 2007 the championship was promoted mainly in Japan, initially as one of eight championships that made up the New Japan Pro-Wrestling (NJPW) J-Crown Championship. After the J-Crown was discontinued the title remained in Japan promoted by the Toryumon federation until 2007 when it returned to Mexico and CMLL. CMLL was a member of the National Wrestling Alliance (NWA) until the late 1980s but chose to keep the championship and the NWA prefix after leaving the NWA.