Manipulated Organism: Animals - Coho Salmon Transgenic expression of growth hormone in coho salmon led to a narrower body, more red muscle mass, and smaller white muscle fibers.Transgenic coho salmon expressing growth hormone had enlarged heads, reduced viability, and accelerated development of their life cycle.Coho salmon engineered for transgenic expression of growth hormone were more aggressive predators in simulated natural environments. Database Home Seth JordanAugust 30, 2020