Red dwarf rasbora
| Red dwarf rasbora | |
|---|---|
| |
| Microrasbora rubescens | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Cypriniformes |
| Family: | Danionidae |
| Subfamily: | Danioninae |
| Genus: | Microrasbora Annandale, 1918 |
| Species: | M. rubescens
|
| Binomial name | |
| Microrasbora rubescens Annandale, 1918
| |
The red dwarf rasbora (Microrasbora rubescens) is a species of freshwater ray-finned fish belonging to family Danionidae. It is the only species in the genus Microrasbora.[2] The generic name means "small Rasbora", however these are more closely related to the danios than rasboras.[3] They inhabit freshwater in Myanmar and Yunnan, China.[4]
Taxonomy
[edit]Microrasbora, until recently, included a number of described species. Microrasbora erythromicron was first shown to be a member of the genus Danio in 1999.[5] This move has been confirmed by numerous studies.[3][6] Three other species, M. gatesi, M. kubotai, and M. nana were moved to a new genus, Microdevario,[6] leaving Microrasbora rubescens as the only confirmed species in the genus. However, Fang et al. did not comment on the placement of Microrasbora microphthalma, although Eschmeyer's Catalog of Fishes has placed this species in Microdevario.[2]
Description
[edit]The dwarf red rasbora reaches up to 3.0 cm (1.2 in) in length. Its meristics are that there are 2 spines and 6-7 soft rays in the dorsal fin and 3 spines and 10-12 soft rays in the anal fin.[7] The females are less instensly coloured than the males and are larger and have a much deeper body.[8]
Habitat
[edit]The dwarf red rasbora is endemic to Lake Inle which is situated in a valley where the rocks form a karst and which lies 900m above sea level in the Shan Plateau region of Shan State.[8] Within the lake this species can be found in the midwater and in the marginal waters of Lake Inle where it is associated with submerged vegetation and forms large schools.[1]
Conservation
[edit]The red dwarf rasbora is exploited for the aquarium trade and it is thought this may have some impact on the population. It is also threatened by the introduction of exotic fish species to the lake, particularly Parambassis and Tilapia species, which act as both predators on and competitors with the red dwarf rasbora. In addition the lake has been polluted from a number of sources, especially from the growing human population in settlements around the lake, while sedimentation and agricultural runoff enters the lake from its drainage basin. The invasive water hyacinth has covered large areas of the lake and this has reduced the area of open water in the lake, this effect being exacerbated by water abstraction and sedimentation.[1]
References
[edit]- ^ a b c Vidthayanon, C. (2011). "Microrasbora rubescens". IUCN Red List of Threatened Species. 2011: e.T181058A7657299. doi:10.2305/IUCN.UK.2011-1.RLTS.T181058A7657299.en. Retrieved 19 November 2021.
- ^ a b Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Species in the genus Microrasbora". Catalog of Fishes. California Academy of Sciences. Retrieved 17 February 2025.
- ^ a b Mayden, Richard L.; Tang, Kevin L.; Conway, Kevin W.; Freyhof, Jörg; Chamberlain, Sarah; Haskins, Miranda; Schneider, Leah; Sudkamp, Mitchell; Wood Robert M.; Agnew, Mary; Bufalino, Angelo; Sulaiman, Zohrah; Miya, Masaki; Saitoh, Kenji & He, Shunping (2007): Phylogenetic relationships of Danio within the order Cypriniformes: a framework for comparative and evolutionary studies of a model species. Journal of Experimental Zoology B: Molecular and Developmental Evolution 308B(5): 1-13. doi:10.1002/jez.b.21175 PMID 17554749 (HTML abstract)
- ^ Froese, Rainer; Pauly, Daniel (eds.). "Species in genus Microrasbora". FishBase. March 2019 version.
- ^ Kottelat, M. & Witte, K.E. (1999): Two new species of Microrasbora from Thailand and Myanmar, with two new generic names for small Southeast Asian cyprinid fishes (Teleostei: Cyprinidae). Journal of South Asian Natural History 4(1): 49-56.
- ^ a b Fang, F., Norén, M., Liao, T. Y., Källersjö, M. & Kullander, S. O. 2009. Molecular phylogenetic interrelationships of the south Asian cyprinid genera Danio, Devario, and Microrasbora (Teleostei, Cyprinidae, Danioninae). Zoologica Scripta 38:237-256.
- ^ Froese, Rainer; Pauly, Daniel (eds.). "Microrasbora rubescens". FishBase. March 2015 version.
- ^ a b "Microrasbora rubescens ANNANDALE, 1918 Red Dwarf 'Rasbora'". Seriously Fish. Retrieved 8 October 2017.
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