Corresponding author: Tak-Kei Chou ( saifish5678@hotmail.com ) Academic editor: Ronald Fricke
© 2021 Tak-Kei Chou, Chi-Ngai Tang.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Chou T-K, Tang C-N (2021) Southward range extension of the goldeye rockfish, Sebastes thompsoni (Actinopterygii: Scorpaeniformes: Scorpaenidae), to northern Taiwan. Acta Ichthyologica et Piscatoria 51(2): 153-158. https://doi.org/10.3897/aiep.51.68832
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The goldeye rockfish, Sebastes thompsoni (Jordan et Hubbs, 1925), is known as a typical cold-water species, occurring from southern Hokkaido to Kagoshima. In the presently reported study, a specimen was collected from the local fishery catch off Keelung, northern Taiwan, which represents the first specimen-based record of the genus in Taiwan. Moreover, the new record of Sebastes thompsoni in Taiwan represented the southernmost distribution of the cold-water genus Sebastes in the Northern Hemisphere.
cold-water fish, DNA barcoding, neighbor-joining, new recorded genus, phylogeny, Sebastes joyneri
The rockfish genus Sebastes Cuvier, 1829 is the most speciose group of the Scorpaenidae, which comprises about 110 species worldwide (
On an occasional survey in a local fish market (25°7.77′N, 121°44.47′E), a mature female individual of Sebastes thompsoni (Jordan et Hubbs, 1925) was obtained in the local catches, which were caught off Keelung, northern Taiwan, by a bottom trawl. Based on the literature records, however, the goldeye rockfish, S. thompsoni, was previously known from southern Hokkaido southward to Kochi and Nagasaki at a depth of 80–160 m (
Members of the Sebastes are similar in external appearance between the closely related species (
Counts and measurements generally followed
DNA was extracted from the muscle by the GeneMark Easy Tissue and Cell Genomic DNA Purification Kit, procedures following the manufacturer’s protocol. PCR amplifications were used a 25 μL volume containing 3 μL of 10× Taq Buffer, 2 μL of dNTP mixture at 10 mM each, 1 μL each of forward and reverse primer at 5 μM, 0.125 μL of Pro Taq Plus DNA polymerase (Protech Technology Enterprise, Taiwan), 1 μL of template DNA and the remainder made up with ultrapure water. The portion of COI was amplified using combinations of universal COI primer pairs (
This study identified the specimen NMMB-P33709 (Figs
Morphometric measurements of examined specimen of Sebastes thompsoni from Taiwan (NMMB-P33709).
Character | Value | |
---|---|---|
[%SL] | [mm] | |
Standard length | 170.9 | |
Head length | 34.2 | |
Snout length | 8.1 | |
Orbit length | 10.8 | |
Interorbital width | 8.2 | |
Postorbital length | 16.6 | |
Upper jaw length | 14.6 | |
Body depth 1 | 31.2 | |
Body depth 2 | 35.5 | |
Body width | 17.1 | |
Caudal peduncle depth | 10.0 | |
Upper peduncle length | 11.6 | |
Lower peduncle length | 18.1 | |
Pectoral-fin length | 29.2 | |
Pelvic-fin length | 21.9 | |
Dorsal-fin base length | 60.4 | |
Spinous dorsal-fin base length | 32.2 | |
Soft dorsal-fin base length | 24.8 | |
Preanal length | 69.5 | |
Predorsal length | 33.2 | |
Prepelvic length | 40.8 | |
Anal-fin base length | 19.7 | |
Pelvic-to-anal-fin length | 30.6 | |
1st dorsal-fin spine length | 7.4 | |
2nd dorsal-fin spine length | 10.4 | |
3rd dorsal-fin spine length | 14.1 | |
1st anal-fin spine length | 6.9 | |
2nd anal-fin spine length | 13.4 | |
3rd anal-fin spine length | 13.3 | |
Pelvic-fin spine length | 13.3 | |
Gill raker length | 16.1 |
(NMMB-P33709). Dorsal-fin elements XIII, 14; anal-fin elements III, 7; all dorsal- and anal-fin rays branched; pectoral-fin rays 16, lowermost eight rays unbranched; pelvic-fin elements I, 5, all soft rays branched; total caudal-fin rays 37, principal caudal-fin rays 8 + 8 (upper + lower), procurrent rays 11 + 10 (upper + lower); pored lateral-line scales 54, not including 3 pored scales extending on to the caudal fin; gill rakers on first gill arch 11 + 27 (upper + lower), all rakers developed; pseudobranchial filaments ca. 40; branchiostegal rays 7; vertebrae 11 + 15 (precaudal + caudal) = 26 (total).
Body relatively deep and compressed. Mouth moderately large, slightly oblique, posterior margin of maxilla not reaching middle level of orbit. Dorsal fin continuous, fourth spine longest, length of remaining spines gradually shorter posteriorly, except last spine (13th) distinctly longer than penultimate spine; shape of soft portion of dorsal fin triangular, length of soft rays gradually shorter posteriorly. Anal fin with three spines, second and third spine long, subequal in length; shape of soft portion of anal fin triangular, length of soft rays gradually shorter posteriorly. Caudal fin emarginate.
Lower jaw with short symphyseal knob, pointed and protruding anteriorly; upper jaw with band of tiny conical teeth, outermost row larger; lower jaw with band of tiny conical teeth; both jaws without enlarged canines; vomer with V-shaped tooth patch, formed by tiny conical teeth; palatine with two long narrow tooth patches with tiny conical teeth.
Head spines relatively short, except spines on opercle and pre-opercle; lachrymal with two sharp, developed spines, posterior one slightly longer than anterior; nasal spines present, situated above each anterior nostrils; upper margin of orbits with pre-orbital and postorbital spines; pair parietal ridge, posterior end terminating with weak spine; single, short cleithral spine present, located above uppermost edge of opercle membrane; short supracleithral spine, located anterior to cleithral spine; opercle with two prominent spines, subequal in length; margin of pre-opercle with five robust and developed spines.
Body mostly covered with tiny ctenoid scales. Head fully scaled, including snout, cheek, lower jaw (dentary and angular surface) and maxilla; scales present on branchiostegal membrane. Dorsal and anal fins scaled; tiny ctenoid scales covering more than half of fin, some scales extending further along fin rays; pectoral fin base with ctenoid scales, scales gradually becoming smaller and extending to fin along fin rays; pelvic fin with scales present along spine and rays, scales becoming cycloid distally; caudal-fin fully scaled, its base covered with relatively larger ctenoid scales, remaining area generally covered with tiny ctenoid scales, distal end of fin covered with tiny cycloid scales.
In fresh condition (Fig.
In the molecular analysis, a total of 22 COI sequences of three species of Sebastes were obtained to reconstruct the neighbor-joining tree (Fig.
According to several studies of biodiversity of fishes in Taiwan, 62 species of the Scorpaenidae (sensu
We identified this specimen as the genus Sebastes, based on a combination of characters: weak spines on head and opercular bones; dorsal-fin spines XIII; relatively large body size; and fins were not elongated. In addition, the genus Sebastes can easily be distinguished from most Scorpaenidae species by having a greater number of vertebrae (mostly more than 25), except for Adelosebastes, Hozukius, Sebastolobus, and Trachyscorpia (see
Based on the morphological and molecular evidence, we recognized the specimen (NMMB-P33709) as Sebastes thompsoni in the presently reported study. It was originally described, based on two type specimens collected from Iwate and Osaka in Japan, respectively (
The genus Sebastes is generally limited to temperate and boreal regions (
A similar case was reported in
We thank C.-H. Chan (NMMBA) for the curatorial assistance. We thank Dr H.-C. Ho for critically reading the manuscript. We are grateful to Dr. T.-Y. Liao (NSYSU) for the support of molecular work. This study was partly supported by the National Marine Museum of Biology and Aquarium and National Sun Yat-sen University, Taiwan.