Sebastes koreanus Kim et Lee, 1994

Myoung, Se Hun, Myoung, Jung-Goo, Jawad, Laith A., Kim, Maeng Jin & Park, Joo Myun, 2022, First report of abnormal body coloration in Sebastes koreanus (Actinopterygii: Perciformes: Sebastinae), Acta Ichthyologica et Piscatoria 52 (3), pp. 209-213 : 209

Sebastes koreanus Kim et Lee, 1994

Sebastes koreanus Suggested English common name: yellow Korean rockfish

Sebastes koreanus Figs 2 , 3

Description.

Body moderately compressed (Fig. 2 ). Strong spines on head. Large mouth and eyes large. Maxilla not reaching posterior margin of eye. Dorsal fin continuous, notched between 13th spine and 14th spine; soft part of dorsal fin length similar to spinous part length. Origin of anal fin same as origin of soft part of dorsal fin. Pectoral fin large; upper half rounded; rays of lower half thickened; origin of pectoral fin located on second spine of dorsal fin; posterior margin located on 11th spine of dorsal fin. Pelvic fin short; origin of pelvic fins located behind origin of pectoral fins. Pectoral and pelvic fins covered with skin and ctenoid scales near base. Caudal fin truncated. Lateral line sloping moderately downward above pectoral fin.

Dorsal fin rays XIV, 12; anal fin rays III, 6; pectoral fin rays 16; pelvic fin rays I, 5; lateral line pores 31. Proportions as percentage (%) of SL (163.4 mm): head length 37.6; head width 22.0; head depth 31.0; snout length 11.1; orbit diameter 9.1; interorbital width 6.5; body depth 39.0; body width 21.3; upper jaw length 16.8; pre-dorsal fin length 35.6; pre-anal fin length 74.4; pectoral fin length 29.9; pelvic fin length 24.5; 1st dorsal fin spine length 5.3; 2nd dorsal fin spine length 7.8; 3rd dorsal fin spine length 11.4; longest dorsal fin ray length 15.7; 1st anal fin spine length 7.0; 2nd anal fin spine length 16.1; 3rd anal fin spine length 14.0; caudal peduncle length 18.3; caudal peduncle depth 11.1.

Body generally orange, upper part of head faded yellow, with two slight dark red stripes behind and under eye (Fig. 2 ). Anterior and posterior parts of eyes faded yellow with bit of red. Dorsal side of body red and ventral side pale yellow. Membrane of spine dorsal fin interspersed with red dots on pale yellow background. Membrane of soft dorsal fin orange and tip pale yellow. Pelvic and anal fins red. Caudal fin dark red interspersed with tiny black dots. Front of pectoral fin red, but in middle and rear, red dots scattered on faded red background.

Remarks.

Based on the analysis of the COI gene sequence (577 bp) of the presently reported specimen and the mtDNA COI region of S. koreanus registered in the NCBI, the genetic distance between the two individuals was found to be 0.002. The other four species in the genus Sebastes had genetic distances of 0.032-0.051 (Fig. 3 ).

Figures

Figure 2. Specimens of Sebastes koreanus with abnormal and natural body colorations between presently reported and previous studies, 197.3 mm total length, Ongdo, Yellow Sea, Korea. Scale bar = 5 cm.

Figure 3. A neighbor-joining tree based on the partial mitochondrial DNA COI gene region using Sebastes koreanus (KIOST _ 22 _ 001) showing the relations among the four species of Sebastes and one outgroup (Sebastiscus marmoratus). Numbers at the branches indicate bootstrap probabilities in 10 000 bootstrap replications. Scale bar equals 0.01 of Tamura and Nei's distance (1993) with K 2 parameter model. Abbreviation: COI, cytochrome oxidase subunit I.