Blue-eye trevalla. The colour of the blue-eye varies from silvery with a steel blue back to pinkish brown with a purplish tinge. The eye of the fish is a deep blue with a golden ring. The caudal fin of the fish is forked and the fins are generally a dark metallic grey. The flesh is firm and white and very good eating. is also known as deepsea trevalla, blue eye cod and blue eye.