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Parental and F1 hybrid fish from the X. helleri × (X. maculatus Jp 163 B × X. helleri) cross type. (A) X. helleri, Sarabia strain, male parent; (B) X. maculatus Jp 163 B, female parent; (C) F1 hybrid; (D) light pigmentation (Lp) phenotype backcross hybrid; (E) heavy pigmentation (Hp) phenotype backcross hybrid; (F) tumor-bearing, UV-irradiated backcross hybrid. Animals shown in D and E are from the same brood, photographed at approximately 5 months of age.
