Epagri’s latest genetic-selection results frame the heavier tilapia as both a research milestone and an economic tool for fish farmers. After five generations of breeding, the Santa Catarina agency says the fish can reach 39% more weight, using individual identification, DNA testing and targeted crosses to select traits including faster growth, cold tolerance and disease resistance.¹

The program began in 2009 with the Asian-origin Gift strain and has since developed the Epagri SC04 line for intensive pond farming under Santa Catarina’s subtropical conditions. Researcher Bruno Corrêa da Silva described the progress as incremental: “With each new generation of tilapia, we are able to add a little more yield. That is how we reached 39% greater weight.”²

The emphasis on cold tolerance reflects a local constraint. Tilapia eat less and grow more slowly through the winter, while the state’s terrain can limit the construction of suitable ponds. Epagri says selected fish averaged more than four grams of daily growth in warmer months, compared with as little as two grams during colder periods.²

For hatchery operators, the claimed benefits extend beyond final weight. Miguel Faust of Piscicultura Faust said the selected stock has brought “faster growth, better feed conversion, higher fillet yield and much better adaptation” to the state’s climate, particularly lower temperatures.² Epagri has distributed more than 318,000 breeding fish to 56 producers in 11 states since 2014; it says 90% of Santa Catarina’s fingerling producers use its genetic material.¹

Yet the agency’s own guidance tempers the promise of improved genetics. Intensive production still requires correctly built ponds, water and health management, biosecurity and feeding calibrated to fish size and water temperature. Extension worker Darci Pitton Filho warned that commercial tilapia farming “does not allow amateurism”: high potential returns also bring elevated risks.²