| 词条 | Batasio |
| 释义 |
| image = Batasio fasciolatus.jpg | image_caption = Batasio fasciolatus | taxon = Batasio | authority = Blyth, 1860 | type_species = Pimelodus batasio | type_species_authority = F. Hamilton, 1822 }} Batasio is a genus of catfish of the family Bagridae. These small fish are found in fast-flowing hillstreams throughout South and mainland Southeast Asia. TaxonomyBatasio was first described by Edward Blyth in 1860 with Batasio buchanani (a needless renaming of Batasio batasio) designated as type.[1] B. pakistanicus, described in 1989, is tentativelly placed in Batasio, but its generic placement is questionable.[2][3]SpeciesThere are currently 18 recognized species in this genus:
DistributionBatasio species are generally found throughout South and mainland Southeast Asia.[3] B. affinis is found in Myanmar.[10] B. fluviatilis is found in Northern Malay Peninsula.[11] B. tigrinus is also recorded from Thailand.[12] B. dayi originates from the Salween and Irrawaddy River drainages in Myanmar.[13] B. elongatus is found in southwestern Myanmar.[3] B. macronotus originates from eastern Nepal.[7] B. pakistanicus is found in the Indus River.[14] B. batasio also originates from northern India where it shares its habitat with Mystus vittatus.[21] B. fasciolatus is known from the Tista River drainage, a tributary of the Brahmaputra River.[4] B. merianiensis is found in the Brahmaputra River drainage.[4] B. sharavatiensis originates from the Sharavati River in Uttara Kannada, Karnataka.[9] B. spilurus is known from the Brahmaputra River drainage in the vicinity of Dibrugarh.[4] B. tengana is known from the Ganges and the Brahmaputra River drainages; it is apparently restricted to upper reaches of larger rivers.[4] B. travancoria is distributed in the Chittar, Kallada and Pamba Rivers in southern Kerala and is considered a rare species.[9]Appearance and anatomyBatasio species typically have enlarged sensory pores on their head, laterally compressed heads and bodies, and at least 35 vertebrae.[4] B. tengana, B. pakistanicus and B. spilurus differ from other Batasio species in that their adipose fin is much shorter.[4] These fish are small catfish.[3] B. pakistanicus and B. spilurus are the smallest species, reaching only {{convert|35|mm}} SL and {{cvt|45|mm}} SL respectively.[4] The other species range from {{cvt|55|-|101|mm}} SL.[4]B. affinis, B. dayi, and B. fluviatilis have bars or bands, spots or stripes, and are not plain-bodied.[9] B. pakistanicus has a black humeral spot with a dark streak on the dorsum.[9] B. batasio has a dark stripe along the lateral line and another above.[9] B. batasio does not exceed 10 centimetres (4 in).[21] B. fasciolatus and B. tigrinus are the only Batasio species in which the adult colouration consists of five or six vertical dark brown bars on a light brown body.[4] B. tengana has bands descending from the dorsal surface to the lateral line.[9] B. travancoria has a lateral stripe along the lateral line and a faint shoulder spot.[9]B. sharavatiensis is the only Batasio that has a completely plain and colourless body; its adipose fin is almost confluent (continuous) with the caudal fin save for a small notch.[9]Batasio, like most other bagrids, are easy to sex. The male has a visible genital papilla just fore of the anal fin.[21] Gravid female B. tengana (South East Asian form) are easy to identify because the pink eggs can be seen through their semi-transparent belly when they swim near light.[21]EcologyBatasio species generally are found in fast-flowing hillstreams.[3] B. fluviatilis is found in rivers and streams with moderate to swift current and a predominantly rocky bottom, and is less often in slow-flowing streams with a muddy substrate.[11] B. tengana occurs in rivers and canals and is found in torrential streams.[15] B. travancoria occurs in hillstreams and rivers at the bases of hills.[16]B. fluviatilis hide among stones or submerged vegetation during the day and come out at night to feed.[11]B. batasio appears to mimic Mystus vittatus, with which it inhabits the same habitat.[21]In the aquariumB. tengana, though uncommon, is the most commonly encountered species of Batasio in the aquarium hobby.[17] B. tengana does well in captivity, and has been bred in captivity. The fish spawned in soft neutral water, but raising the fry, of which there were over 200, proved difficult.[17] The temperature for the Indian species should remain between {{convert |20|-|22|°C|F}}; the Southeast Asian Batasio will tolerate slightly warmer waters. It appears that all Batasio need a lot of current and a high oxygen content.[17]B. batasio is another species in the hobby, but can be easily confused with Mystus vittatus.[17] B. travancoria has only once been imported to the U.S.[17] In captivity, the experience of one aquarist is that specimens of B. travancoria show little interest in all foods offered and slowly lose weight over a span of a few months and perish.[17]References1. ^{{FishBase genus|genus=Batasio|year=2015|month=October}} {{Taxonbar|from=Q3346558}}2. ^{{cite journal|url=http://mapress.com/zootaxa/2011/f/z02901p058f.pdf |title=Batasio convexirostrum, a new species of catfish (Teleostei: Bagridae) from Koladyne basin, India |authors = Darshan, A., Anganthoibi, N. & Vishwanath, W. |journal=Zootaxa |volume=2901 |pages=52–58 |year=2011}} 3. ^1 2 3 4 5 {{cite journal|url=http://www.pfeil-verlag.de/04biol/pdf/ief15_1_07.pdf|title=Batasio elongatus, a new species of bagrid catfish from southwest Myanmar (Siluriformes: Bagridae)|authors=Ng, H.H.|journal=Ichthyological Exploration of Freshwaters|volume=15|issue=1|pages=67–70|date= 2004}} 4. ^1 2 3 4 5 6 7 8 9 10 {{cite journal|title=The identity of Batasio tengana (Hamilton, 1822), with the description of two new species of Batasio from north-eastern India (Teleostei: Bagridae)|authors=Ng, H.H.|journal=Journal of Fish Biology|year=2006|volume=68|issue=Suppl. A|pages=101–118 |doi=10.1111/j.0022-1112.2006.001019.x}} 5. ^{{cite journal|title=Batasio feruminatus, a new species of bagrid catfish from Myanmar (Siluriformes: Bagridae), with notes on the identity of B. affinis and B. fluviatilis|year =2008| authors=Ng, H.H. & Kottelat, M.|journal=Ichthyological Exploration of Freshwaters|volume=18|issue=4|pages=289–300 }} 6. ^{{cite journal |author=Plamoottil, M. |year=2015 |title= Batasio flavus, a new catfish species (Siluriformes: Bagridae) from Kerala, India |journal= Journal of Research in Biology |volume=5|issue=5|pages=1799–1808|url=http://jresearchbiology.com/documents/RA0520.pdf }} 7. ^1 2 {{cite journal|url=http://www.pfeil-verlag.de/04biol/pdf/ief15_4_02.pdf|title=Batasio macronotus, a new species of bagrid catfish from Nepal (Teleostei: Bagridae)|authors=Ng, H.H. & Edds, D.R.|journal=Ichthyological Exploration of Freshwaters|volume=15|issue=4|pages=295–300|date= 2004}} 8. ^{{cite journal| title=Batasio procerus, a new species of catfish from northern Myanmar (Siluriformes: Bagridae)|authors=Ng, H.H.|journal=Ichthyological Exploration of Freshwaters|volume=19|issue=1|pages=1–6|date= 2008}} 9. ^1 2 3 4 5 6 7 8 {{cite journal |url= http://www.geocities.com/fishyanu/Batasio.pdf |title=A New Species of the Genus Batasio Blyth (Siluriformes: Bagridae) from Sharavati River, Uttara Kannada, Karnataka |authors=Bhatt, A. & Jayaram, K.C. |journal=Zoos' Print Journal |volume=19 |issue=2 |pages=1339–1342 |date=2004 |archiveurl= https://www.webcitation.org/query?url=http://www.geocities.com/fishyanu/Batasio.pdf&date=2009-10-25+22:14:39 |archivedate= 2009-10-25 }} 10. ^{{FishBase|genus=Batasio|species=affinis|year=2015|month=October}} 11. ^1 2 {{FishBase|genus=Batasio|species=fluviatilis|year=2015|month=October}} 12. ^{{FishBase|genus=Batasio|species=tigrinus|year=2015|month=October}} 13. ^{{FishBase|genus=Batasio|species=dayi|year=2015|month=October}} 14. ^{{FishBase|genus=Batasio|species=pakistanicus|year=2015|month=October}} 15. ^{{FishBase |genus=Batasio |species=tengana |year=2015 |month=October}} 16. ^{{FishBase|genus=Batasio|species=travancoria|year=2015|month=October}} 17. ^1 2 3 4 5 6 7 8 9 10 {{cite journal|url=http://www.catfishstudygroup.org/pdf/catfishes_of_asia1.pdf|title=The Catfishes of Asia Family Bagridae part one|authors=Linder, R.S.|journal=Cat Chat|volume=1|issue=1|date=2000|deadurl=yes|archiveurl=https://web.archive.org/web/20070820183907/http://www.catfishstudygroup.org/pdf/catfishes_of_asia1.pdf|archivedate=2007-08-20|df=}} 6 : Bagridae|Fish of South Asia|Fish of Southeast Asia|Catfish genera|Freshwater fish genera|Taxa named by Edward Blyth |
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