Redtail notho
| Redtail notho | |
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| Species: | N. guentheri
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| Binomial name | |
| Nothobranchius guentheri (Pfeffer, 1893)
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The redtail notho (Nothobranchius guentheri) is a species of fish in the Aplocheilidae family. It is endemic to Tanzania. Its natural habitats are intermittent rivers and intermittent freshwater marshes. The redtail notho eats mosquito larvae and other planktonic creatures. Scientists are looking at introducing the species elsewhere in Africa to help with malaria prevention. As with other "peat spawner" killifish, pairs or small groups spawn by repeatedly pushing into the substrate and releasing and fertilising a single egg. During the dry season when the temporary pools of water the fish inhabit dry up and the adult fish perish, specially adapted proteins (chorion) in the eggshell are triggered to retain moisture, thereby ensuring the next generation of fish last until the rains return and the fry can hatch. Once the fry detect a change in pressure (due to being submerged again), and an increase in dissolved carbon dioxide concentration, an enzyme, chorionase is released to soften the eggshell and allow the fish to hatch. This species is sometimes encountered in the aquarium trade. Eggs have a dry incubation of between 8 and 12 weeks, but most hatch after 9 weeks.
References
- Hanssens, M & Snoeks, J. 2005. Nothobranchius guentheri. 2006 IUCN Red List of Threatened Species. Downloaded on 4 August 2007.
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