|Scientific Name:||Hemitrygon navarrae|
|Species Authority:||(Steindachner, 1892)|
Dasyatis navarrae (Steindachner, 1892)
Trygon navarrae Steindachner, 1892
|Taxonomic Source(s):||Last, P.R., Naylor, G.J.P. and Manjaji-Matsumoto, B.M. 2016. A revised classification of the family Dayatidae (Chondrichthyes: Myliobatiformes) based on new morphological and molecular insights. Zootaxa 4139(3): 345-368. http://doi.org/10.11646/zootaxa.4139.3.2.|
|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.|
|Red List Category & Criteria:||Data Deficient ver 3.1|
|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:|
|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.|
Native:China (Beijing, Fujian, Jiangsu, Liaoning, Shandong, Shanghai, Zhejiang); Taiwan, Province of China (Taiwan, Province of China (main island))
|FAO Marine Fishing Areas:|
Pacific – northwest
|Range Map:||Click here to open the map viewer and explore range.|
|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|
|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.|
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:||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 30 April 2017.|
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