Millions of fish are harvested across the world each year, but nearly half are killed due to diseases. However, studies have found that by inserting alligator genes into catfish, their survival chances increase by fivefold. The gene, dubbed cathelicidin, contains properties that protect reptiles from infections when wounded. Typically, farmers treat sick fish with antibiotics, but this contributes to the development of antibiotic-resistant bacteria. But now scientists at Auburn University in Alabama are fusing the DNA of the two species. Scientists used CRISPR to insert the alligator gene that codes for cathelicidin into catfish. It found the survival rate of...