{{:goldnrainbow.jpg?200|}}The scientific name of the rainbow trout is Oncorhynchus mykiss. Resident freshwater rainbow trout adults average between 1 to 5 pounds (0.45 to 2.3 kg), while lake dwelling and anadromous forms may reach 20 pounds (9.1 kg). Golden rainbow trout are predominantly yellowish, lacking the typical green field and black spots, but retaining the diffuse red stripe.