Hemitrygon navarrae 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Chondrichthyes Myliobatiformes Dasyatidae

Scientific Name: Hemitrygon navarrae (Steindachner, 1892)
Common Name(s):
English Blackfish Stingray
Dasyatis navarrae (Steindachner, 1892)
Trygon navarrae Steindachner, 1892
Taxonomic Source(s): Eschmeyer, W.N., Fricke, R. and Van der Laan, R. (eds). 2016. Catalog of Fishes: genera, species, references. Updated 29 September 2016. Available at: (Accessed: 29 September 2016).
Taxonomic Notes: The genus Hemitrygon formerly was a junior synonym of Dasyatis (Kottelat, 2013); it was resurrected by Last et al. (2016) in their revision of the family Dasyatidae.

Assessment Information [top]

Red List Category & Criteria: Data Deficient ver 3.1
Year Published: 2016
Date Assessed: 2007-01-03
Assessor(s): Wang, Y., Ebert, D.A., Samiengo, B. & Vidthayanon, C.
Reviewer(s): Valenti, S.V. & Fowler, S.L.
This is an amended version of the 2007 assessment to accommodate the recent change in genus name from Dasyatis to Hemitrygon.

The Blackfish Stingray (Hemitrygon navarrae is an inshore stingray, occurring from southern Taiwan, Province of China to the Yellow Sea, northern China. Very little information is available on this species' habitat and biology, but males are reportedly mature at 38 cm disc width. Inshore trawl fisheries are often intense within this species' range. It is taken as a utilized bycatch and is one of three most commonly marketed stingrays in China. However, the species is still poorly known and no data are available to determine catch levels. It is assessed as Data Deficient at present and efforts should be made to quantify catch levels and monitor population trends to enable reassessment.
Previously published Red List assessments:

Geographic Range [top]

Range Description:Northwest Pacific: Yellow Sea, East China Sea, Bohai Sea to northern China and off Taiwan, Province of China (Nishida and Nakaya 1990). Taiwan, Province of China is the southern extent of the range.
Countries occurrence:
China (Beijing, Fujian, Jiangsu, Liaoning, Shandong, Shanghai, Zhejiang); Taiwan, Province of China (Taiwan, Province of China (main island))
FAO Marine Fishing Areas:
Pacific – northwest
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Difficulties with species identification among Dasyatids makes it very difficult to determine population trends. This is a cold water species, so is perhaps more common in the Yellow Sea than Taiwan, Province of China (D. Ebert and Y. Wang pers. obs.).
Current Population Trend:Unknown
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:Primarily an inshore species, but no specific information is available on the depth range. Adult males measured 38 cm disc width (DW) (based on the holotype), 60-94 cm total length (TL) (Zhu and Meng 2001). Very little is known of the habitat and biology of this species.

Threats [top]

Major Threat(s): Taken as bycatch by trawl fisheries, including shrimp trawls operating on the continental shelf (D. Ebert pers. obs. 2007). Habitat destruction through industrialization may also be impacting shallow water species such as this off China and Taiwan Island (D. Ebert, C. Vidthaynon pers. obs.).

Commonly captured as bycatch in demersal trawls operating off China (Zhu and Meng 2001), but only of low value. One of three most commonly marketed of dasyatids in China, although no information is available on trends. There are difficulties with accurate identification of Dasyatid species.

Conservation Actions [top]

Conservation Actions: No conservation measures in place.

Citation: Wang, Y., Ebert, D.A., Samiengo, B. & Vidthayanon, C. 2016. Hemitrygon navarrae. The IUCN Red List of Threatened Species 2016: e.T161741A104120965. . Downloaded on 21 May 2018.
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