雙線舌鰨

Dorsal spines (total): 0; Dorsal soft rays (total): 107 - 113; Analspines: 0; Analsoft rays: 80 - 88

Eyed side brown with an irregular dark blotch on gill cover, blind side white. Blind side with 2 lateral lines (dorsal and medial). Body elongate, its depth 22 to 29% SL. Eyes with a small scaly interorbital space. Snout rounded. Rostral hook short. Corner of mouth reaching posteriorly beyond lower eye, nearer to gill opening than to tip of snout. Caudal-fin rays usually 12. Midlateral-line scales 88 to 96. Scales ctenoid on eyed side of body. Cycloid on blind side. Scale rows between lateral lines on eyed side of body 13 to 16 (Ref 9895).

Occurs in coastal areas and estuaries. May ascend upstream into the freshwater tidal zone of the Mekong (Ref. 12693). Inhabits muddy and sandy bottoms of continental shelves. Feeds mainly on benthic invertebrates (Ref. 3391). Utilized as a food fish (Ref. 3391). Marketed fresh in the Mekong delta (Ref. 12693).

fisheries: commercial

Cynoglossus bilineatus (Lacépède)

Achirus bilineatus Lacépède, 1802:6 [type-locality: China and the East Indies].

Cynoglossus bilineatus.—Ogilby, 1910:39.—Weber, 1913b:443. —Norman, 1926:301 [Queensland]; 1928:198.—Weber and de Beaufort, 1929:194.—Herre, 1933:5 (Sandakan, N. Borneo); 1934:105 [Manila].—Roxas and Martin, 1937:70 [Philadelphia].—Hyardenberg, 1941:226 [Merauke, New Guinea].—Suvatti, 1950:326.—Hyerre, 1953:189 [Philippines].—Munro, 1955:264, pl. 50: fig. 767; 1958:285 [Merauke].—Saramma, 1963:75 [Kerala coast].—Pradhan, 1964:458 [Bombay coast].—Marshall, 1964:468, pl. 64: fig. 454 [east coast of North Queensland].

Plagusia quadrilineata Bleeker, 1851a:412; 1852:21.

Arelia quadrilineata.—Raup, 1858:107 [Java, Sumatra].—Oshima, 1927:198 [Tainan, Taihoku].

Cynoglossus quadrilineatus.—Günther, 1862:497.—Kner, 1867:295.—Bleeker, 1875:32, pl. 245: fig. 3.—Klunzinger. 1871:573.—Day, 1877 [in part]:435; 1880:409.—Madeay, 1884:53.—Alcock, 1889a:288.—Day, 1889 [in part]:457.—Smith and Pope, 1906:498 [Kochi].—Jenkins, 1910a:30.—Wu, 1932:144.

Cynoglossus lineolatus Steindachner, 1867:588 [Hong Kong].—Bleeker, 1873:133.—Rutter. 1897:88 [Swatow].—Reeves, 1927:14.—Chu, 1931:95.—Wu, 1932:150.—Fowler. 1934b:218 [Hong Kong, Swatow].

Cynoglossus quinquelineatus Day, 1877:432, pl. 98: fig. 1 [type-locality: Madras]: 1889:453.—De Silva, 1956:198.—Norman, 1928:197.

Cynoglossus sindensis Day, 1877:434, pl. 90: fig. 6 [type-locality: from Sind through the seas of India].—Jordan and Richardson, 1908:281.—Ogilby, 1910:37 [Croker Island, Northern Territory. Australia].—Norman, 1926:302.—De Silva, 1956:198.

Arelia diplasios Jordan and Evermann, 1903:367, fig. 29 [type-locality: Formosa].—Jordan and Richardson. 1909:202, fig. 25 [Formosa].—Oshima. 1927:204.

DESCRIPTION.—Based on 24 specimens, 95.0–338.0 mm SL, including the holotype of Cynoglossus quinquelineatus Day.

Depth of body 22.22–28.60 (M = 25.86), length of head 19.15–24.40 (M = 22.21) percent of standard length. Diameter of eye 6.40–11.90 (M = 9.04), interorbital width 5.0–10.71 (M = 7.86) percent of length of head. Two nostrils on eyed side, anterior one tubular, in front of lower eye. The posterior nostril in anterior half or middle of interorbital space. Snout rounded, 32.61–54.39 (M = 37.15), rostral hook, short, reaching hardly before vertical through front border of anterior nostril. Maxillary extending beyond fixed eye; angle of mouth extending to below vertical from posterior border of lower eye, slightly nearer to branchial opening than to tip of snout; snout to angle of mouth 46.44–56.90 (M = 51.38), angle of mouth to branchial opening 47.92–55.56 (M = 49.97) percent of length of head.

Scales: Ctenoid on ocular side except those on lateral lines; scales of blind side and those of lateral lines of ocular side cycloid.

Lateral-Line System: Two lateral lines on ocular side,7 88–96 scales on median lateral line, 13–16 scales between the two lines. Two lateral lines on blind side.

Interlinear scale rows 13 14 15 16

Frequencies 6 17 5 4

Fins: Dorsal with 107–113 (M = 110) rays; anal with 80–88 (M = 86) rays, caudal 12 in 10 specimens (radiographs).

Vertebrae: 51–53 comprising 9 abdominal and 42–44 caudal elements in 10 specimens (radiographs).

Coloration: Upper side in alcohol brownish with an irregular dark patch on opercular region, lower whitish.

Size: Largest specimen examined, 354.0 mm, is from Colombo.

DISTRIBUTION.—From Malay Archipelago to the coasts of India and Pakistan and to New Guinea (Croker Island, Northern Territory) and coasts of Queensland and Taiwan and Japan (Kuchi).

DIAGNOSIS AND

分布於印度-西太平洋區，由波斯灣至印尼、菲律賓，北至日本，南至澳洲等。台灣西部海域有產。

中大型魚類，通常以底拖網捕獲，以煎食、紅燒或加工製品食之，具食用經濟價值。

體長舌形，極側扁；兩眼均位於左側。鼻孔兩個。口小，下位，口裂弧形；口角緣近於鰓蓋後緣；上頜向後達下眼後緣下方或之前；眼側無齒，盲側具細小絨毛狀齒；鋤骨與腭骨無齒。眼側唇緣無觸鬚或穗狀物。鰓膜與峽部分離兩側皆被櫛鱗；眼間隔處具鱗片；兩側皆具二條側線。背鰭、臀鰭與尾鰭相連；無胸鰭；腹鰭與臀鰭相連；尾鰭尖形；背鰭軟條數 110-119；臀鰭軟條數 86-95；腹鰭軟條數 4；尾鰭軟條數 11-12；脊椎骨數 50-55。眼側一致為淡黃褐色，鰓蓋處具一暗色區域；盲側體白色。

棲息於近海大陸棚泥沙底質海域，可進入河口域或受潮差影響之河段。以底棲之無脊椎動物為食。

Cynoglossus bilineatus és un peix teleosti de la família dels cinoglòssids i de l'ordre dels pleuronectiformes que viu al Golf Pèrsic, a la costa oest de l'Índia i Sri Lanka, Indonèsia, Filipines, Japó i a l'est i al nord d'Austràlia.

Cynoglossus quadrilineatus, the fourlined tonguesole, is a species of tonguefish native to the Indian Ocean from Pakistan to the western Pacific Ocean where it occurs from Japan to northern Australia. It can be found in marine and brackish waters (entering fresh waters in the tidal zone of the Mekong River) in estuaries and coastal waters out to the continental shelf at depths of from 10 to 400 metres (33 to 1,312 ft). This species can reach a length of 44 centimetres (17 in) SL though most do not exceed 30 centimetres (12 in) SL. It is important in local commercial fisheries.

Cynoglossus bilineatus es una especie de pez de la familia Cynoglossidae en el orden de los Pleuronectiformes.

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Cynoglossus bilineatus Cynoglossus generoko animalia da. Arrainen barruko Cynoglossidae familian sailkatzen da.

双线舌鳎（学名：Cynoglossus bilineatus）为輻鰭魚綱鰈形目鰨亞目舌鳎科舌鳎属的鱼类，俗名双线鞋底鱼、重双线鳎、龙利。分布于西达红海及桑给巴尔、南达昆士兰及美拉尼西亚、北达日本南部以及海南岛、两广到福建、台湾等近海等，属于暖水性浅海底层鱼，棲息深度10-400公尺，體長可達44公分，棲息在沿岸沙泥底質水域、河口或大陸棚，以底棲性無脊椎動物為食，可做為食用魚。该物种的模式产地在中国。

Inhabits muddy and sandy bottoms of the continental shelf, down to about 80 m. Feeds mainly on benthic invertebrates (Ref. 3391). Occurs at a temperature range of 26.0-29.0 °C (Ref. 4959).