Rafael D. Guerrero

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Dr. RAFAEL D. Guerrero III is recognized for his pioneering work on tilapia sex reversal technology that contributed significantly to world aquaculture. Cultured tilapia has become a global food commodity and is now the second most important farmed fish.

Heine and World Aquaculture Society president Kevin Fitzsimmons conferred the award to Dr. Guerrero during the 6th International Symposium on Tilapia in Aquaculture held in Manila. He began his initial studies on tilapia sex reversal process for his doctoral dissertation at Auburn University in the USA in early 1970s, and later continued the work at the Central Luzon State University in Muñoz, Nueva Ecija where he served as the first dean of its college of fisheries.

With the technology, fishfarmers produce high yields of fast growing large-sized all-male tilapia.

Dr. Guerrero also previously received national awards such as the Rizal Pro Patria, Ten Outstanding Young Men, and IBM Science and Technology recognition for his outstanding contributions to fisheries and aquaculture in the country and for pioneering in the commercialization of the tilapia sex reversal technology in the world.

He is an academician of the National Academy of Science and Technology. He was also included in the 1978 TOYM Awardees for Fisheries and Aqua Culture.


  • Diploma(1 yr.) in Agribusiness Management 1984 University of the Philippines at Los Baños, College, Laguna
  • Ph.D. Fisheries Management 1974 Auburn University, Auburn, Alabama, USA
  • M.S. Applied Zoology 1970 University of the Philippines at Los Baños, College, Laguna
  • B.S. Zoology 1964 University of the Philippines Diliman, Quezon City