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Taiwanese Blind Electric Ray

Benthobatis yangi Carvalho, Compagno & Ebert 2003

Diagnostic Description

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This species is distinguished from all its congeners by the following unique set of characters: both dorsal and ventral surfaces dark brown to purplish-black, with irregular whitish blotches ventrally; narrow nasoral region, with relatively small mouth, slender jaws and shallow circumoral groove; relatively small spiracles; very narrow gill-slits; the second dorsal fin is slightly larger than first, with more slanted anterior margin, broadly rounded apex, and convex posterior margin; low caudal fin, relatively elongated; interdorsal distance greater than distance between second dorsal and caudal fin; suprascapula very narrow and not arched posteriorly; males sexually mature between 19.1-21.5 cm TL; relatively high number of caudal vertebral centra (38-46), total vertebral centra (116-120) (Ref. 75959).
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Biology

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A benthic species found on continental slope. Mainly feeds on polychaete worms (Ref. 114953). Stomach contents include mud and the partial remains of an unidentified polychaete worm, plus unattached polychaete bristles and unidentified small white objects (Ref. 75959). Maturity size of males at 16-19 cm TL (Ref. 114953).
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分布

provided by The Fish Database of Taiwan
分布於太平洋、大西洋、印度洋各熱帶和亞熱帶海區,產於臺灣西南部。
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利用

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偶由底拖網捕獲,非重要之經濟魚類。
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描述

provided by The Fish Database of Taiwan
以前所記載之深海電鱝(/Benthobatis moresbyi/)為本種之誤鑑。體盤橢圓且細長,體盤邊緣有一條連續的曲線,與吻部、胸鰭前緣、胸鰭頂點,後緣及內緣不明顯,胸鰭後緣及內緣與尾巴基部相連接。皮膚腹部表面可見橢圓形發電器。洩殖孔至尾部距離為吻到洩殖孔距離之2.5倍。噴水孔前之頭長為兩噴水孔間距之三倍;嘴至吻的距離為兩鼻瓣外側距離的三倍。鰓裂小稍呈圓拱形,第三鰓裂通常最大。鼻瓣短,前鼻瓣獨立但中間具有隔膜。吻稍厚,嘴唇光滑周圍嘴圍繞中等大的溝槽,嘴角具明顯的唇瓣且包住唇軟骨。嘴寬度為兩噴水孔間距之1.5倍。嘴及顎尖端形成短管狀可幫助開口或增加持久度;上排牙齒15列,下排牙齒14列。體盤兩側呈灰紫色或黑紫色,浸漬福馬林後褪色成深褐色;背鰭、腹鰭及尾鰭邊緣顏色較淡;腹面表面有不規則之淡奶油色斑點位於腹鰭及尾鰭位置上。(陳柔蓉、林沛立2012/11編寫)
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棲地

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屬深海底棲生物。
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Benthobatis yangi

provided by wikipedia EN

Benthobatis yangi, the Taiwanese blind electric ray, is a species of fish in the family Narcinidae endemic to Taiwan. Its natural habitat is the upper continental slopes of coastal waters.

Description

Relatively few specimens are known so far. Mature individuals of this species reach a length of 19.1 - 21.5 cm. Both dorsal and ventral surfaces are dark brown to purplish-black, with irregular whitish blotches on the belly. Gill slits are very narrow; the second dorsal fin is slightly larger than first.[2]

Distribution and habitat

The species appears to have a very limited distribution on continental shelves at a depth of less than 300 m, on the coast of southwestern Taiwan (off Tungkang).[1]

Feeding habits

Like all species of electric rays, B. yangi uses its electric shocks to paralyze prey. Remains of polychaete worms are found in some specimens, meaning that these animals are the preferred prey of B. yangi.

Conservation

B. yangi is not a target of fishery but appears to be taken (and discarded) as bycatch in shrimp fisheries, which in the region use very fine nets that likely prevent capture avoidance by the animal. Based on the very limited distribution and possible high rate of bycatch mortality, the IUCN has classified the species as Vulnerable.[1]

References

  1. ^ a b c Rigby, C.L.; Chen, X.; Ebert, D.A.; Herman, K.; Ho, H.; Hsu, H.; Zhang, J. (2020). "Benthobatis yangi". IUCN Red List of Threatened Species. 2020: e.T161624A124517235. doi:10.2305/IUCN.UK.2020-3.RLTS.T161624A124517235.en. Retrieved 20 November 2021.
  2. ^ Froese, Rainer; Pauly, Daniel (eds.) (2016). "Benthobatis yangi" in FishBase. 7 2016 version.
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Benthobatis yangi: Brief Summary

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Benthobatis yangi, the Taiwanese blind electric ray, is a species of fish in the family Narcinidae endemic to Taiwan. Its natural habitat is the upper continental slopes of coastal waters.

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