Diagnosis: It differs from other known species of the genus Salmo in the numerous irregular narrow parr marks, usually more than or equal to 14, in the lateral line; upper row of parr marks more than or equal to 10; lower row of parr marks variable, usually more than or equal to 5; two conspicuous black spots placed at the right and left sides of the iris and two less visible spots at the upper and lower sides of the iris; numerous black, small spots at the upper side of the body and several red ocellated and non-ocellated spots placed in the middle of the body; black spots sometimes extended to the opercular region and the caudal fin; ethmoid bone with a characteristic T shape; premaxilla bone with small and inclined upper process; from 14-16 scales from base of adipose fin to lateral line; from 12-14 dorsal fin pterygophores; and 9 molecular autopomorphies in MT-CYTB gene in the nucleotide positions 60, 216,474, 504, 732, 849, 915, 990, 1090 (Ref. 107622).

Description: It is a small-sized species that rarely reaches 250 mm standard length; the body is slightly more elongated in comparison to other trout populations, with maximum body depth, at the level of the anal origin, ranging from 16.1-18.7% of standard length in females and 15.5-18.5% of standard length in males (Ref. 107622). The head is large in relation to the body, in comparison to all trout populations except those of the Ifni and Miaami populations, with head length 22.6-24.9% of standard length in females and 23.7-25.8% of standard length in males; the anterior part of the head shows a flat snout; the preorbital distance is short and the proportion with respect to the head length is 18.6-20.7% of head length in females and 18.1-21.3% of head length in males; the fourth and fifth infraorbitals are narrow and sparsely extend over the hyomandibular bone; the eye size is large and the horizontal diameter of the eye is 29.4-31.8% of head length in females and 28.5-33.5% of head length in males (Ref. 107622). The supramaxilla is large and slender; its length is more than half of the maxilla; the maxilla is short and the proportion, with respect to the head length, is 46.3-53.2% of standard length in females and 48.9-52.3% of standard length in males; the upper jaw is deep; the maximum height of the upper jaw, in proportion to its length, is 33.0-38.4% of upper jaw length in females and 31.8-38.7% of upper jaw length in males; the caudal peduncle is slightly deeper than in other populations, and the proportion of the body at the least depth, with respect to caudal peduncle length, is 23.6-26.9% of caudal peduncle length in females and 24.0-28.0% of caudal peduncle length in males; the teeth in vomer, premaxilla and glossohyal are very robust (Ref. 107622).

Colouration: The colouration is slightly yellow, lighter in the ventral area, and brownish in the dorsal region; the fins are slightly yellow with orange marginal borders of caudal and adipose fins; dorsal, pelvic and anal fins in adults have white anterior edges; the dorsal fin presents a black line below the white mark; the dorsal fin has small black and red spots; body with numerous small spots, which are black and slightly ocellated in the dorsal region and red spots, not ocellated, in the middle of the body; the iris has two black, conspicuous lateral spots and two less conspicuous above and below the iris; parr marks are narrow, irregular and numerous, placed in the middle of the body, sometimes divided into two marks (Ref. 107622). The species has a characteristic opercular black spot, and another spot just above it, usually ocellated; there are usually numerous black spots in the opercular area and the caudal fin; there are eight or nine black spots on the dorsal body, very conspicuous in juveniles, which tend to disappear in adults (Ref. 107622).